How to convert a vector to be a string

Question

Izzat Brgli 2021-3-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/785831-how-to-convert-a-vector-to-be-a-string

评论： Stephen23 2021-3-30

采纳的回答： Matt J

在 MATLAB Online 中打开

I'm trying to convert a vector to be a string. for example

[1,2,3,4] -> "[1,2,3,4]"

so I did write this func

function [output] = make_string(arr)
            output ={};
            for i=1:length(arr)
                output{end+1} = strcat('[',num2str(arr{i}),']');
            end
        end

but unfortunately, it takes a lot of computing time and my script became really slow. So is there any other solution?

thanks a lot in advance

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Stephen23 2021-3-30

https://xyproblem.info

https://en.wikipedia.org/wiki/XY_problem

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Answer 1

Matt J 2021-3-28

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string(mat2str([1,2,3,4,5]))
ans = "[1 2 3 4 5]"

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Answer 2

Ken Garrard 2021-3-28

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https://ww2.mathworks.cn/matlabcentral/answers/785831-how-to-convert-a-vector-to-be-a-string#answer_660531

在 MATLAB Online 中打开

You don't need a cell array for this problem and your make_string function has errors. See doc 'cell arrays'.

If you want a comma between the values in the output string you can use the sprintf function.

s = ['[' sprintf('%g, ',A(1:end-1)) sprintf('%g]',A(end))];

This is also about 40% faster than mat2str.

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Izzat Brgli 2021-3-28

编辑：Izzat Brgli 2021-3-28

what do you recommend to do? because I agree with you it's inefficient

Stephen23 2021-3-28

"what do you recommend to do?"

Exactly like I wrote in my last comment, I reccomend that you give more details of what you are currently doing, so that someone can help you. If you do not give example code, we cannot guess exactly what you are doing.

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