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

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.

[Ran Yang]

Use char to specify your file instead.

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

[xingxingcui]

@Ran Yang But I still want my input function parameters to be explicitly double-quoted rather than single-quoted

[Ran Yang]

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

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

[xingxingcui]

@Ran Yang

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

Answer 1

[Ran Yang]

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.

[xingxingcui]

Thanks for your reply, but the situation I encountered above did not work, adding "myMexMatlabFunc(""./imageViewSt.yml"")" as an input parameter ended up being interpreted as not having any double quotes?

myMexMatlabFunc(./imageViewSt.yml)

------------A minimalist Case-----------

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

disp(hello world)

|

Invalid expression. Check for missing multiplication operator, missing or

unbalanced delimiters, or other syntax error. To construct matrices, use

brackets instead of parentheses.

[xingxingcui]

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

now it works! thanks very much!

[Ryan Livingston]

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.