How do I pass the correct string for a function input parameter?

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cui,xingxing 2023-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/1944969-how-do-i-pass-the-correct-string-for-a-function-input-parameter

评论： Ryan Livingston 2023-4-12

For example, I want to debug a mex file using valgrind in a linux terminal and need to pass in a string using the following command, how should I properly ensure that the function input parameters are of the string type?

I.e. how do I nest string double quotes within a string in matlab function imput arguments?

Using Valgrind

matlab -nojvm -nosplash -r "myMexMatlabFunc(myParams)" -D"valgrind --tool=memcheck --leak-check=yes --log-file=valMatlabLog"

note: myParams is string type params.

I tried adding the following double quotes to the input parameters but it didn't work.

matlab -nojvm -nosplash -r "myMexMatlabFunc(""./imageViewSt.yml"")" -D"valgrind --tool=memcheck --leak-check=yes --log-file=valMatlabLog2"

myMexMatlabFunc(./imageViewSt.yml)

Invalid use of operator.

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Ran Yang 2023-4-11

在 MATLAB Online 中打开

Oh, that's a Linux terminal problem. Try using \".

-r "myMexMatlabFunc(\"./imageViewSt.yml\")"

cui,xingxing 2023-4-11

@Ran Yang

Thank you for your answer, it works! Please revise your question slightly so that I can accept the answer

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采纳的回答

Ran Yang 2023-4-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1944969-how-do-i-pass-the-correct-string-for-a-function-input-parameter#answer_1213339

编辑：Ran Yang 2023-4-11

在 MATLAB Online 中打开

In a Linux terminal, you can use a backslash (\) within quotes to escape formatting, which allows you to put quotes within quotes.

-r "myMexMatlabFunc(\"./imageViewSt.yml\")"

will be interpreted as:

-r "myMexMatlabFunc("./imageViewSt.yml")"

and allows you to pass strings into Matlab this way.

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cui,xingxing 2023-4-11

在 MATLAB Online 中打开

matlab -nojvm -nosplash -r "disp(\"hello world\")"

now it works! thanks very much!

Ryan Livingston 2023-4-12

To make this simpler to think about, I put anything non-trivial in a script or function and then just call that with -r myFunctionOrScript or -batch myFunctionOrScript. That helps you avoid the need to deal with shell quote escaping and the like.

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