storing data from function

Question

Jonathan 2012-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/40019-storing-data-from-function

评论： nazrin mokhtar 2020-2-28

Hi,

I have this code in my function file: [sound, freq] = wavread(file) and for some reason sound and freq are not being stored in the workspace. What am I doing wrong?

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Jonathan 2012-5-31

But when I enter [sound, freq] = wavread(file) into the command line, the variables store in the workspace.

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Answer 1

Oleg Komarov 2012-5-31

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If you're using wavread inside a function then you have to return them to your base workspace explicitly because the workspace of a function is kept separate.

Example, will not return sound and freq to the base workspace:

function foo(file)
[sound, freq] = wavread(file)
end

You have to declare the outputs explicitly:

function [sound, freq] = foo(file)
[sound, freq] = wavread(file)
end

and call it as

[out1,out2] = foo(file)

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Jonathan 2012-5-31

I tried that. sound and freq show up in the command line, but not in the workspace.

Jonathan 2012-5-31

nevermind, I had a bit of code at the very end that wasn't defined so the function wasn't finishing. Thanks for the help!

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Answer 2

Stephen 2012-5-31

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So, you have:

function something
[sound, freq] = wavread(file);
end

? If so, you need to output those values like

function [sound, freq] = something

then when you call the function, it will spit out those values. Otherwise, they only exist in the temporary workspace of the function, which gets cleared out when it's done