Load particular data in a .m file from another .m file from different folder.

Hi,

I have two folders in the drive as D:/data/folder1, D:/data/folder2.

In folder1, I created a 'M1.m' file which loads different data of different TYPES and length as A, B, C....

Now I want to use data 'A' in my 'M2.m' file in folder2 and I am trying this

load('D:/data/folder1/M1.m') in M2.m but it gives me an error.

Can you help me to know, How can I access data 'A' in M2.m?

Thanks

[Michael Madelaire]

What is the error?

[Vikram Rathore]

Error using load Number of columns on line 2 of ASCII file D:\data\folder1\M1.m must be the same as previous lines.

[Stephen23]

This does not make much sense:

load('D:/data/folder1/M1.m')
%                       ^^

.mat files can be loaded (they contain data).

.m files can be run/evaluated (they contain code).

Do not mix up code and data, they are completely different things.

Most likely you just need to run that Mfile, passing any arguments as required. But without actually knowing exactly what format those files have, this is just guesswork.

[Vikram Rathore]

Yes, I tried run 'filepath' also but now it only loads the variable from M1.m. All the preceding variables I defined in M2.m lost from the workspace.

[Stephen23]

"All the preceding variables I defined in M2.m lost from the workspace."'

There are multiple reasons why that might happen:

• your code does not pass the required values as input/output arguments.
• your code calls clear.
• you are looking in the wrong workspace.
• That variable is not actually created.
• etc.

If you do not show us the code that you are trying to run we can only make guesses.

[Vikram Rathore]

I didn't call clear but now I put 'run ..' in the beginning and then defined rest of the variables. It is working fine now(So silly I am!!).

Thanks a lot,

Regards,

Answer 1

[Rik]

I'm going to guess that your m file is not a function but a script. I would recommend using functions for anything but testing. That way you can make your code modular. The function below will execute the script and return the A variable.

function A=getA
%run the script and return the A variable 
run('D:/data/folder1/M1.m')
end

You shouldn't use this as a structural solution.

[Vikram Rathore]

Thanks a lot, this also worked for me.

Best Regards

[Mayur Mhetras]

Thank you Sir for your answer. I was also having similar dought and it solved using your answer.