Convert a single char array to a vector of doubles with a non-whitespace delimiter [R2017b, Windows7]

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TJ 2018-1-4

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https://ww2.mathworks.cn/matlabcentral/answers/375531-convert-a-single-char-array-to-a-vector-of-doubles-with-a-non-whitespace-delimiter-r2017b-windows7

编辑： Birdman 2018-1-4

Hi,

I have a binary file that when I load up into Matlab produces the following cell which contains a cell array called data:

1x1 cell array:
{'44.565,433.4544,34.332'}

This can be a very long list of numbers and I would like to avoid using str2num (which works fine). I have tried using:

slope = sprintf('%s,',data{:})
doubleArray = sscanf(slope, '%f')

This only give me the first number. I suspect this is because I have a ',' as a delimiter and not a whitespace character.

str2double(data)

returns a NaN and I suspect this is because I have a single char array in a cell and not an array of strings.

Any advice as to how to do this without str2num?

Cheers, TJ

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Stephen23 2018-1-4

在 MATLAB Online 中打开

Using sscanf is most efficient:

sscanf(a{1}, '%f,')

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Answer 1

Birdman 2018-1-4

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https://ww2.mathworks.cn/matlabcentral/answers/375531-convert-a-single-char-array-to-a-vector-of-doubles-with-a-non-whitespace-delimiter-r2017b-windows7#answer_298650

编辑：Birdman 2018-1-4

在 MATLAB Online 中打开

a={'44.565,433.4544,34.332'};
str=a{1}(:);
strNum=str2double(strsplit(str.',','))

Thanks to Stephen Cobeldick, another and faster approach:

sscanf(a{1}, '%f,')

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TJ 2018-1-4

在 MATLAB Online 中打开

Thanks, that worked great. I also found that the following works:

strNum = sscanf(a{:}, '%f,')

Birdman 2018-1-4

My pleasure and you had multiple options, perfect!

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Convert a single char array to a vector of doubles with a non-whitespace delimiter [R2017b, Windows7]

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