how to update a variable in a .mat file for matlab?

Question

I have a matlab .mat file that stores a bunch of variables. How do I update a single variable?

I tried doing this:

load('filename.mat');
variable='Test';
save('filename.mat',variable);

but it says

??? Error using ==> save
Variable 'C:\' not found.

What does this mean and how can I fix it?

Thank you!

`load` loads all variables in the .mat file into the current workspace, so you shouldn't need to specify which variables to save should you? — slugonamission, Nov 08 '11 at 00:45

score 8 · Accepted Answer · answered Nov 08 '11 at 01:05

I think you are looking for the "-append" option:

save('filename.mat','-append');

For MAT-files, -append adds new variables to the file or replaces the saved values of existing variables with values in the workspace.

score -1 · Answer 2 · answered Nov 08 '11 at 00:43

-1

To save an individual variable to a .mat file, you need to quote its name:

save('filename.mat','variable');

answered Nov 08 '11 at 00:43

5

doesn't this create a file with only 'variable' in it? If there are other variables in the file, they will be lost. – stardt Nov 08 '11 at 01:27

2 Answers2