MATLAB: Is permission denied to save workspace variables

function save

I want to save my workspace variables with function "save something.mat" and it says: Error using save Unable to write file something.mat: permission denied. Why it happens? How can I change it? Thank you very much.

Best Answer

Perhaps you don't have write permissions in the directory where you try to save the results. In that case it might be for a good or bad reason - I typically have disabled write permissions in my directories where I save my raw-data (In my case for good reason based in self-preservation), so I read data from there and save my results in some adjacent work/analysis/results-directory.

HTH

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MATLAB: Load

Please read the Getting Started chapters of the documentation. There you find the explanation, that each function has its own workspace - a kind of container for the local variables - to avoid interferences. The command load imports the contents of the file in the current workspace, such that it appears in the base workspace, when it runs in the command windows. But when load is called inside a function, the imported variables are available only there. And this is important and safe.

To reduce confusions and unwanted side-effects it is recommended to store the output of load in a variable:

Data = load(FileName);

Then using Data.a shows directly, where the value is comming from. But in:

a = 3.1415;
load(FileName);  % NOT CLEAN!
disp(a);

Now it is impossible to know the source of the value of a when reading the source code. This makes the debugging much harder.

MATLAB: Error Permission access denied

Are you sure you don't already have the file open in Excel? If so, it won't let you save it while it's already open. I know starting with Windows 7 there are a lot of folders that you cannot save to any longer, such as anything under the Program Files folder, and sometimes others that you wouldn't think should have such a restriction, like C:\Users and C:\ProgramData, though C:\Users\nkumar\Documents would be allowable.

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MATLAB: Load

MATLAB: Error Permission access denied

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