"delete" does not find a file?

Question

Danijel Domazet 2020-5-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/525115-delete-does-not-find-a-file

评论： Walter Roberson 2020-5-13

Why wouldn't this work:

if isfile(filename)
    delete filename
end

filename is a char vector.

File is not deleted, and I get a warning: Warning: File 'filename' not found.

How could it be not found if isfile returned true? Am I doing some beginer mistake?

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Stephen23 2020-5-13

"Why wouldn't this work: "

Because you are using outdated, misleading, sadly overused command syntax.

Use function syntax instead.

https://www.mathworks.com/help/matlab/matlab_prog/command-vs-function-syntax.html

Danijel Domazet 2020-5-13

Will do, thanks.

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Answer 1

Walter Roberson 2020-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/525115-delete-does-not-find-a-file#answer_432188

在 MATLAB Online 中打开

if isfile(filename)
    delete(filename)
end

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Danijel Domazet 2020-5-13

Thanks.

It doesn't look like here: https://www.mathworks.com/help/matlab/ref/delete.html

:-)

Walter Roberson 2020-5-13

在 MATLAB Online 中打开

Look at the example,

delete *.mat

That is not going to ask MATLAB to look at all variables that are in scope and see if they are structs with field named mat, or objects with property named mat, or objects with method named mat, and then evaluate as appropriate in order to get the names of the files to delete. NOT done.

Instead it is treated as

delete('*.mat')

which tells it to delete all files in the current directory whose extension is .mat

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