m file is not reading variables from the workspace

Hello,

I'm having problems with my script, it doesn't want to read the variables from the workspace. I tried several things, among them evalin and it still doesn't work. I don't want to have to copy the data and physically paste it to the script, does anybody knows how to solve this problem? I keep getting the error current has not been assigned, although the variable current is in the workspace already (this variable was created by another file). How can I call current from the workspace so the m file can read the variable?

Here is a short version of my file and I'm omitting the equations as they are pretty long.

Jphotototal=current(1,:); plot(lambda,Jphotototal,'ro'); hold on L0=[0.1 0.1]; options = optimset ('Maxiter',1000,'tolfun',1e-20,'TolX',1e-20,'MaxFunEvals',1000); L=lsqnonlin('recfun',L0,0,400,options);

Thanks, Francisco

[Chirag Gupta]

Ensure that its a script and not a function.

[Francisco]

Hi Gupta,

It is actually a function, is there a way to bypass this problem? there must be a way to call the variables into the function file correct?

Answer 1

[Chirag Gupta]

Functions have their own workspaces. Scripts on the other hand run in the base workspace where you have your data.

You could always save your workspace data into a MAT file:

save ('filename','variable Name');

and then in your function use the command:

load('filename')

Apart from this you can use the following command:

VarName = evalin('base','VarNameFromBase')

and then use VarName in your function

[Francisco]

Hi Gupta,

I already tried saving the data into a mat file and then loading it to the function file, but it didn't work! :( I'll try varname and hope that works. I was also told about assignin, so I'll try that too! :)

Answer 2

[Walter Roberson]

"current" is probably being defined in the workspace of a different function, unless that other function is using assignin('base',...)

[Francisco]

Hi Walter,

That is correct, the variable current is acquired from a different script and it is located in the base workspace. My file is a function file and it only works if I physically copy and paste the variables into the file. I've never used assignin but I'll look into it and I hope this can solve the problem. Thanks! :)

Answer 3

[Francisco]

Hey guys, I tried loading the data again after noticing a mistake I had and voila, the file works!! :) Thanks for your help and for future reference, yes, saving the variables in a MAT file and then loading them to the function file does work!! :)

Thanks guys!!

Francisco

Answer 4

[BA Lamine]

Hello Gupta,

I tried to use the instruction

variableName_in_myFunction = evalin('ws', variableName_in_workspace);

the instruction doesn't work in the simulation in Simulink. Here the error that I had when I try to run the simulation : Error evaluating registered method 'Outputs' of M-S-Function myFunction in mySimulinkModel. Undefined function or variable variableName_in_myFunction.

Does someone had this error?

Would you please want to help me?

Thank you in advance and your collaboration.

Lamine