MATLAB Answers

How to save variables in MATLAB function in the workspace

2 views (last 30 days)
Good day.
I have a MATLAB function which I run from a script. I want to plot some variables in the function from my script so I want to save these variables in my workspace. Is there any way to do it other than using them as an output to the function when I call it from the script? The variables are many so I am trying to avoid too many output arguments.
Thanks now and always.

  1 Comment

Stephen Cobeldick
Stephen Cobeldick on 29 May 2020
Messing around with assignin or lots of output variables is not a good approach.
Just assign the variables to fields of a structure and return that. Simple.

Sign in to comment.

Accepted Answer

Robin Kirsch
Robin Kirsch on 29 May 2020
Use assignin command
function y = test()
assignin('base','x',42)
y = 0
end

  4 Comments

Show 1 older comment
Robin Kirsch
Robin Kirsch on 29 May 2020
assignin('base','x',42) will create a variable x in the base workspace and fill it with the number 42.
Robin Kirsch
Robin Kirsch on 29 May 2020
this works only if you run your function first and then run your script to plot the variables of course

Sign in to comment.

More Answers (1)

Cris LaPierre
Cris LaPierre on 29 May 2020
You could save them to a mat file. When you want to plot them, load the mat file in your script.
You could also consider placing the variables in a structure. That way, your function only needs to have one output, yet all the variables can be passed out.

  9 Comments

Show 6 older comments
ojonugwa adukwu
ojonugwa adukwu on 1 Jun 2020
Yea. My codes are lengthy. A script and four functions. But I have resolve it using the idea proposed by
Stephen Cobeldick (assignin). It takes time but it ok for me until I get a better one.
Many thanks for everything.
Cris LaPierre
Cris LaPierre on 1 Jun 2020
Just to clarify, that wasn't Stephen's suggestion. His recommendation was NOT to do that. He suggested using a structure, as did I. That would likely be the quickest approach since you don't have to write the variables to the workspace or the harddrive.
ojonugwa adukwu
ojonugwa adukwu on 1 Jun 2020
Sorry. I meant Robin Kirsch. The "assignin" he suggested is slow but it is faster than the process of saving to matfile. I really do not know why that has been extremely slow for me. Hopefully I will get to know why.
Thanks so much

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!