Bugs/Feedback

Reply Sent By vineeta.p:
Hi, This error is because the Scimax is not installed on Scilab on cloud. You can install it on local Scilab and try to execute the code.

Reply Sent By vineeta.p:
Hi, The example is working absolutely fine at our end. Maybe you were trying to execute it on the old scilab on cloud. Please try it again on this link https://cloud.scilab.in/ Select the Category as Aeronautical Engineering/ Aerospace Engineering..., subcategory as Applied Mechanics, then select the same book, chapter, and example. Click on execute after the example is loaded, you shall get the output.

Reply Sent By vineeta.p:
Hi, We executed the code at our end, we have got the output. Maybe there was some server issue when you executed the code. Please check again.

Reply Sent By vineeta.p:
Hi, The example is executed on the old cloud website. Please execute this example on https://cloud.scilab.in/ by selecting the following options from the drop-down: Main category: Chemical Engineering Sub-category: Thermodynamics, then book, chapter, and the example. The example is working fine.

Reply Sent By vineeta.p:
Hi, The example is executed on the old cloud website. Please execute this example on https://cloud.scilab.in/ by selecting the following options from the drop-down: Main category: Electrical Engineering/Electrical & Electronics Engineering/Electronics & Telecommunication Engineering/Instrumentation & Control Engineering Sub-category: Signal Processing/DSP then book, chapter, and example. The example is working fine.

Reply Sent By vineeta.p:
test reply

Reply Sent By Abhinav Dronamraju:
Dear Sankalp, I see that all the queries raised by you doesn't have relevant comments. Please write some relevant comments which explain a little more about what the problem is. That would help us address your queries much faster.

Reply Sent By Abhinav Dronamraju:
Could you please explain what is the problem clearly ? As far as I see everything seems to work properly to me.

Reply Sent By Abhinav Dronamraju:
Thanks for finding out the bug and letting us know. We'll try to rectify the problem as soon as possible.

Reply Sent By Abhinav Dronamraju:
Could you please explain what is the problem clearly ? As far as I see everything seems to work properly to me.

Reply Sent By shamikam:
At the moment, Scilab cloud does not support execution of dependency files. Please download the example from the 'Download Example' link available in the top right hand corner. You will be able to execute the code without any errors.

Reply Sent By vineeta.p:
We had deactivated few chapters and examples due to errors we are in process to resolving it. Once the issues are resolved we shall upload all the missing chapters and examples

Reply Sent By Abhinav Dronamraju:
Your comment is not clear, it would be helpful if you could be more specific. As far as the code is concerned, it works perfectly well according to the Bell Curve Rule.

Reply Sent By Abhinav Dronamraju:
Could you be more specific as to what the exact problem is in your comment. It would help us rectify the mistake, if any.

Reply Sent By vineeta.p:
We shall look at the textbook and verify the code. Thanks for your inputs

Reply Sent By shamikam:
This seems to be an issue with the textbook and not Scilab Cloud. We will resolve this when we do the quality check of the textbook code.

Reply Sent By shamikam:
You need to execute the code on your local machine. The code is dependent on 522.sci. Please download the entire example along with dependency file and then execute it. At the moment, Scilab on Cloud does not support dependency files.

Reply Sent By shamikam:
Please follow the instructions given here- http://www.scilab.in/scilab-symbolic-toolbox

Reply Sent By shamikam:
The code executes properly on cloud. Please try again.

Reply Sent By shamikam:
There is no value to be displayed. All the lines are comments. This is usually the case when Scilab can't be used to code an example.

Reply Sent By shamikam:
The numbers are 21, 23 and 25. The comment stipulates the sum of the 3 odd consecutive numbers have to be 89. Only these three odd numbers satisfy the condition. The code is correct.

Reply Sent By John G.:
"clear all" used to work on older version of Scilab but 'all' has become redundant now in the new version. These books were coded using older versions of Scilab.Hence, In your case Scilab receives "all" as a variable and cannot find it during execution and gives "!--error 4 Undefined variable: all " error. Please remove 'all' from the code and then execute the it.

Reply Sent By shamikam:
This code will not run on the Cloud as it requires user input. You can edit the code to specify values for the variables- start_point, end_point and numtraps. The code will work then.

Reply Sent By shamikam:
The code seems to work fine.

Reply Sent By shamikam:
dft function has become obsolete. Please use FFT Scilab function.

Reply Sent By shamikam:
What is wrong? Four values are displayed. Please be more specific in your comment.

Reply Sent By shamikam:
Which book is this?

Reply Sent By shamikam:
No valid information is given.

Reply Sent By vineeta.p:
We are getting a completely different answer on the cloud. Are you sure you have posted the comment for the correct example?

Reply Sent By shamikam:
Scilab Cloud does not support dependency files at the moment. You can execute the code on your local system by changing the path of the image being read.

Reply Sent By shamikam:
dft is a legacy function that existed in Scilab 5.3.3. dft does not exist in Scilab 5.5 onwards. As the Scilab version has been updated on the Cloud server, dft does not work any more. This is a temporary solution for the example to work on your local machine. Please see the examples given on this page- https://help.scilab.org/docs/6.0.0/en_US/fft.html The code for dft is given. Save the code on your local machine and execute the TBC example. We will sort out this issue on Cloud shortly.

Reply Sent By shamikam:
We are not able to set graphics option over the Cloud. Comment the line set(gca(),"auto_clear","off") Change the for loop from 'for i=1:35' to for i=1:16

Reply Sent By shamikam:
Please comment the line a.x_location = "middle"; It should work fine after that.

Reply Sent By vineeta.p:
We are able to execute it properly.

Reply Sent By vineeta.p:
We are able to execute it properly.

Reply Sent By vineeta.p:
Chart is not an in-built Scilab function. It is a user defined function. We are working on getting dependency files working on Scilab cloud.

Reply Sent By shamikam:
Please read the documentation here- https://help.scilab.org/docs/5.5.2/en_US/wavread.html

Reply Sent By Lavitha:
Please provide the details of the error. The example worked fine when executed to check this bug.

Reply Sent By shamikam:
We are able to execute it properly.

Reply Sent By Lavitha:
imread requires SIP toolbox which is not installed in the cloud server. We are working on this.

Reply Sent By shamikam:
syms requires Maxima toolbox. We will get it working soon on the Cloud server.

Reply Sent By shamikam:
I checked the code. It works fine.

Reply Sent By shamikam:
syms requires Maxima toolbox. We will get it working soon on the Cloud server.

Reply Sent By shamikam:
syms requires Maxima toolbox. We will get it working soon on the Cloud server.

Reply Sent By shamikam:
syms requires Maxima toolbox. We will get it working soon on the Cloud server.

Reply Sent By shamikam:
syms requires Maxima toolbox. We will get it working soon on the Cloud server.

Reply Sent By Lavitha:
To use syms, one needs maxima toolbox. This currently not available on the cloud version. We are working on this.

Reply Sent By Lavitha:
Hi, size(x)=[10,1] size(n)=[1,10] size(w)=[1,501] Due to the inconsistency in the sizes, the matrices cannot be multiplied. Also, element wise multiplication operator (.) should be used. Change the value of K to 9 i.e. K=9 Change the following line X_W = x * exp(-sqrt(-1)*n'*w); to X_W = x* exp(-sqrt(-1).*n.*w) It should work now.

Reply Sent By bhavani.jalkrish:
The code is either incomplete or relies on dependency files which is not getting loaded and thus the following error.

Reply Sent By bhavani.jalkrish:
imread requires SIP toolbox which is not installed in the cloud server. We are working on this.

Reply Sent By bhavani.jalkrish:
Please change the 14 line to the following and execute. H_LPF = horner(H,(2/T)*((z-1)/(z+1)));

Reply Sent By bhavani.jalkrish:
To use syms, one needs maxima toolbox, this hinders the execution. We are currently working on it on the cloud version.

Reply Sent By bhavani.jalkrish:
To use syms, one needs maxima toolbox. This currently not available on the cloud version. We are working on this.

Reply Sent By bhavani.jalkrish:
Please try executing the code again, as it works fine on our end.

Reply Sent By bhavani.jalkrish:
Please try executing the code again, as it works fine on our end.

Reply Sent By bhavani.jalkrish:
To use imread, one needs SIP toolbox. this therefore hinders the execution.

Reply Sent By bhavani.jalkrish:
I don't understand your query. To use syms, one needs maxima toolbox, this hinders the execution

Reply Sent By bhavani.jalkrish:
Please try executing the code again. The code runs perfectly on our side.

Reply Sent By bhavani.jalkrish:
Please try executing the code again. The code runs perfectly on our side.

Reply Sent By bhavani.jalkrish:
The code works well on local machine. The error could be due to version control or excessive memory usage.

Reply Sent By bhavani.jalkrish:
The code is available, try clicking on an other example and then come back to 5.2. Please note that the code is not working as it requires dependency files. We are currently working on it.

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The program is not running due to version incompatibility

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The code runs well on the local machine. We will look in to why it is not executable on cloud.

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We will work on it.

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The code is executing fine. Please remove "clear all;" and "clc;" and try executing the code.

Reply Sent:
The code is executing fine. Please remove "clear all;" and "clc;" and try executing the code.

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The code is executing fine. Please remove "clear all;" and "clc;" and try executing the code.

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sorted

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works while executing in the local machine. This be due to memory problem in the cloud

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The programme executes fine on our end.

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The error maybe due to insufficient memory. The code will work fine in the local machine.

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The error maybe due to insufficient memory. The code will work fine in the local machine.

Reply Sent:
The code is working fine from our end.

Reply Sent:
The code is working fine on our end. Please try again

Reply Sent:
Hi, size(x)=[10,1] size(n)=[1,10] size(w)=[1,501] Due to the inconsistency in the sizes, the matrices cannot be multiplied. Also, element wise multiplication operator (.) should be used. Change the value of K to 9 i.e. K=9 Change the following line X_W = x * exp(-sqrt(-1)*n'*w); to X_W = x* exp(-sqrt(-1).*n.*w) It should work now.

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The program is crashing due to insufficient memory. Please try running the code on your persnal machine.

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The program is crashing due to insufficient memory. Please try running the code on your personal machine.Close

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Thank you for your input. Using input() function will work only local installation of Scilab and not on Cloud.

Reply Sent By Lavitha:
imread requires SIP toolbox which is not installed in the cloud server. We are working on this.

Reply Sent By shamikam:
Code dependent on toolboxes does not work on the Cloud now. We are working on resolving this issue. Please execute the code on your system.

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This code requires maxima tool box. For some reason function symsum does not work. We are yet to figure out a way around this.

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We executed the program and found no errors. Please give us more details.

Reply Sent:

Solution:

s=%s
sys=syslin('c',(s+2)/(s^2+2*s+2))
evans(sys)

d=derivat(sys)
n=numer(d)
a=roots(n)    //a=breakaway points
disp(a,"breakaway points=")
for i=1:2
    K=-(a(i,1)^2+2*a(i,1)+2)/(a(i,1)+2)
        disp(a(i,1),"s=")
        disp(K,"K=")
end
printf("if K is positive breakaway point lies on RL or else on CRL")

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imread function reads the image given in the path and converts into a matrix. In this example you need to have an image. Specify the path of the image file in the imread function.

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Please provide the details of the error.

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Could you provide more details of the error, chapter and book name?

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Edit the code. You will have remove the input function and provide the value of N directly on the cloud editor.

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We were able to execute it without any errors.

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The code should be modified to:
clc;
syms s t;
h=(%e)^(-3*t);
H=laplace(h,t,s);
disp(H,'Transfer Function is');                    

 

Reply Sent By Lavitha:
The error can be due to graphics on cloud server. Please execute the code on local system. It worked for me.

Reply Sent:

We got the output as below.

Observability Matrix=   
 
    1.    1.  
  - 2.  - 2.  
 
 d  =
 
    0.  
 
matrix is singular, so system is unobservable.

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Edit the code. To execute the code, provide values for marks directly rather than using input function.

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It executed. Below is the result of execution.

Khat  =
 
  - 157.63362  - 35.373303  - 56.06524  - 36.746605    50.9684  
 K  =
 
  - 157.63362  - 35.373303  - 56.06524  - 36.746605  
 k1  =
 
  - 50.9684

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It executed. Please execute and try.

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It executed without any error. This was the result of execution.

Output:
5.  7.  23.  45.  78.

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It executed without any error. This was the result of execution.

Output:

H =   
 
          5.0080488 + 25.04s          
    ------------------------------    
                               2   3  
    5.008 + 25.1026s + 5.03247s + s

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Please provide the details like name of the textbook, chapter and example number so that this issue can be checked.

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It executed without any error.

Reply Sent By shamikam:
Scilab on Cloud does not support toolbox functions for now. Please execute the code on a local machine.

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Please comment the commands set(gca(),"auto_clear","on") and set(gca(),"auto_clear","off") before executing the code.

 

 

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Please execute this code:

clc;

vdc=2
r=3
v= 1.6;
i = (vdc-v)/r ;
disp('The diode current in mA is :');
disp(i);

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Please provide the details on example number so that this issue can be checked.

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Please provide the details of the error.

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Please refer the textbook for explaination. The code gives only method of solving.

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There was technical issue. Please check now.

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Please provide the details of the error. The example worked fine when executed to check this bug.

Reply Sent By shamikam:
Scilab on Cloud does not support toolbox functions for now. Please execute the code on a local machine.

Reply Sent:
Please comment the line using command exec and the code should work fine. The corrected code is given below: ftO=50 k=.0000000145*1000*60; kt=1.038; kb=1.39; alpha=0.000098; Po=40; w0=0;//clear// clc clear //exec("10.3data.sci"); w = 0:10:10000; function W=f(w,x) W =zeros(1,1); pt0=.3*Po; y=(1-alpha*w)^.5; ph=pt0*(1.5-x)*y; pt=pt0*(1-x)*y; pb=2*pt0*x*y; rt=-k*kt*ph*pt/(1+kb*pb+kt*pt); rate=-rt; W(1)=-rt/ftO; endfunction pt0=.3*Po; X=ode([0],w0,w,f); for i =1:length(X) y(1,i)=(1-alpha*w(1,i))^.5; ph(1,i)=pt0*(1.5-X(1,i))*y(1,i); pt(1,i)=pt0*(1-X(1,i))*y(1,i); pb(1,i)=2*pt0*X(1,i)*y(1,i); end m1 = X'; m2=y'; scf(1) plot2d(w',[m1 m2]); xtitle( 'Figure E10-3.1', 'w', 'x,y' ) ; legend(['x';'y']); scf(2) l1=ph' l2=pt' l3=pb' plot2d(w',[l1 l2 l3]); xtitle( 'Figure E10-3.2', 'w', 'ph,pt,pb' ) ; legend(['ph';'pt';'pb']);

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You are most welcome! :)

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It is displaying the output as "Strength of magnetic field in free space in A/m : 0.0106103". There is no output error.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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The correct code should be as follows: clc; syms t s; x1=1-%e^t; X1=laplace(x1,t,s); X=integrate(X1,s,0,%inf) The limits of integration can be changed instead of 0 and infinity.

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The correct code should be as follows: clear; syms t s x=1/(s+1) f1=ilt(x,s,t) disp(f1*'u(t)',"a) x(t)=") y=-1/(s+1) f2=ilt(y,s,t) disp(f2*'u(-t)',"b) x(t)=") z=s/(s^2+4) f3=ilt(z,s,t) disp(f3*'u(t)',"c) x(t)=") zz=(s+1)/((s+1)^2+4) f4=ilt(zz,s,t) disp(f4*'u(t)',"d) x(t)=") The reason for this error for inverse laplace transform command is version and/or platform (OS) mismatch.

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There is no output error. Post your query in detail.

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There is no output error. Post your query in detail.

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It worked as expected.

Reply Sent By Lavitha:
The code should be modified to: clc; syms t s; x=2*%e^(-3*t)-%e^(-2*t); X=laplace(x,t,s)

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Please provide the details of the error. The example worked fine when executed to check this bug.

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Please provide the details of the error. The example worked fine when executed to check this bug.

Reply Sent:
The correct code should be as follows: clc; syms t s; x1=1-%e^t; X1=laplace(x1,t,s); X=integrate(X1,s,0,%inf) The limits of integration can be changed instead of 0 and infinity.

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Please replace the command ilaplace by "h=ilt(H,s,t)".

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The corrected should be as follows: clc; syms t s; x=1+%e^(-3*t)-%e^(-t); X=laplace(x,t,s); H=1/((s+1)*(s^2+s+1)); Y=X*H; y=ilt(Y,s,t) Please note that the answer might not in readable form due to large numbers, however if the appropriate calculations are carried out then the answer displayed conforms with the actual answer with good approximation.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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The corrected code should be as follows: clc; syms s t; I=(3*s+4)/(s^2+4*s); i=ilt(I,s,t); disp(i);

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The corrected code should be as follows: clc; syms s t; F=1/((s^2)*(s+2)); f=ilt(F,s,t); disp(f);

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The corrected code should be as follows: clc; syms s t; F=1/((s^2)*(s+2)); f=ilt(F,s,t); disp(f);

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The corrected should be as follows: clc; syms t s; x=1+%e^(-3*t)-%e^(-t); X=laplace(x,t,s); H=1/((s+1)*(s^2+s+1)); Y=X*H; y=ilt(Y,s,t) Please note that the answer might not in readable form due to large numbers, however if the appropriate calculations are carried out then the answer displayed conforms with the actual answer with good approximation.

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The corrected code should be as follows: clc; syms s t; F=1/((s^2)*(s+2)); f=ilt(F,s,t); disp(f);

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Please provide the details of the error. The example worked fine when executed to check this bug.

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The corrected code should be as follows: clc; syms s t; F=1/((s^2)*(s+2)); f=ilt(F,s,t); disp(f);

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Please provide the details of the error. The example worked fine when executed to check this bug.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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You can try the command abs(t), alternatively you can take a positive sqaure-root of (t^2) using the command sqrt.

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You can try the command abs(t), alternatively you can take a positive sqaure-root of (t^2) using the command sqrt.

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The code should be modified to: clc; syms t s; x=2*%e^(-3*t)-%e^(-2*t); X=laplace(x,t,s)

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Please provide the details of the error. The example worked fine when executed to check this bug.

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You have to execute the code on the local machine. Change the path of the image filename to the path of the image file on the local machine.

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This error is encountered as the variable 'f' (frequency) expects a value from user. The problem can be solved by commenting the line asking for input value of 'f' from user and assigning a fixed value (e.g. f = 1000) to the variable 'f'.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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There are 2 bugs in this example and those can be resolved as follows: 1. The error is encountered as the variable 'n' (number of terms) expects a value from user. The problem can be solved by commenting the line asking for input value of 'n' from user and assigning a fixed value (e.g. n = 8) to the variable 'n'. 2. The function 'integ' used in the code should be changed to 'integration', i.e. ao=1/%pi*integrate(exp(-1*x),x,0,2*%pi); ai=1/%pi*integrate(exp(-x)*cos(i*x),x,0,2*%pi); bi=1/%pi*integrate(exp(-x)*sin(i*x),x,0,2*%pi); are the appropriate commands to be used.

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Please provide the details of the error. The example worked fine when executed to check this bug.

Reply Sent By Lavitha:
syms requires Maxima toolbox. We will get it working soon on the Cloud server.

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This issue arises due the copying of text from dependency files, while executing the code. The second user-defined function "series" should start from the next line of the code. Also, the second last line of the code using "simple" function should be commented/deleted since the function is not defined in this code.

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This is due to change in Scilab Version. I have looked into the code. Kindly remove "clear all" in the code and execute. It will work.

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The codes are not available on cloud because of Scilab version issue. We are trying to fix it. Please download the code from http://scilab.in/Completed_Books. These codes need to be modified according to the version and can be used offline.

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This is due to change in Scilab Version. I have looked into the code. Kindly remove "clear all" in the code and execute. It will work. -Lavitha Pereira

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Thanks a lot!

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This is perhaps due to load on the server. I am not really the right person to answer this as I have no knowledge about this.

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These are commands related to symbolic toolbox. These are not supported by Scilab 5.4.1. Also, ilaplace is command for windows based version if I am not wrong, one can try using ilt on linux platform for finding inverse laplace transform (Scilab 5.3.3).

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This query is not clear. I assume pgm refers to program, we need more information about which kind of problems this issue is being faced.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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The function 'integ' used in the code should be changed to 'integration', i.e. wR=integrate(14.4*(sin(%pi/6*s))^2,s,0,6) is the appropriate command to be used.

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The function 'integ' used in the code should be changed to 'integration', i.e. wR=integrate(14.4*(sin(%pi/6*s))^2,s,0,6) is the appropriate command to be used.

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Please provide the details of the error. The example worked fine when executed to check this bug. This example takes long time (about 2 minutes) to execute due to the large number of data points.

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Please provide the details of the error. The example worked fine when executed to check this bug.

Reply Sent By Lavitha:
Hi, size(x)=[10,1] size(n)=[1,10] size(w)=[1,501] Due to the inconsistency in the sizes, the matrices cannot be multiplied. Also, element wise multiplication operator (.) should be used. Change the value of K to 9 i.e. K=9 Change the following line X_W = x * exp(-sqrt(-1)*n'*w); to X_W = x* exp(-sqrt(-1).*n.*w) It should work now.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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Please provide the details of the error. The example worked fine when executed to check this bug.

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This error is encountered as the variables 'sigma_N', 'k' and 'M' expect input values from user. The problem can be solved by commenting the lines asking for input values from user and assigning fixed values as described in the comment at the end of the code.

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The actual code should be as follows: clear; clc; syms t s H1=laplace((%e^(-2*t)),t,s) H2=laplace((2*%e^(-t)),t,s) H=H1*H2 h=ilt(H,s,t); disp(h*'u(t)',"h(t)=") Even if the result is not in a user-friendly (readable) format, the answer computed is approximately equal to the actual answer (i.e. 2e^(-t) - 2e^(-2t) ).

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Give the arbitrary value for 'x' and execute the program.

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Please provide the details like name of the textbook, chapter and example number so that this issue can be checked.

Reply Sent By Lavitha:
syms requires Maxima toolbox. We will get it working soon on the Cloud server.