how to extract double value from a string?

str = "D:\MATLAB\noise_check\bilder\Image_230217_1227_Temp_ 42,75.png";
V = str2double(regexp(str,'\d+','match'))
V = 1×4
      230217        1227          42          75
out = str2double(replace(regexp(str, '\d+,\d+', 'match'),',','.'))
out = 42.7500

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Happy PhD 2023-2-17

编辑：Happy PhD 2023-2-17

My strings are an cell array so maybe thats why it doesn't work.

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Answer 2

Luca Ferro 2023-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/1914425-how-to-extract-double-value-from-a-string#answer_1173985

编辑：Luca Ferro 2023-2-17

assuming the string is always formatted as such you could just:

s='D:\MATLAB\noise_check\bilder\Image_230217_1227_Temp_ 42,75.png'

numS=s(end-8:end-4);

numS2D=replace(numS(',','.'); %necessary since the conversion to double needs . and not ,

numD=str2double(numS2D)

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VBBV 2023-2-17

在 MATLAB Online 中打开

s='D:\MATLAB\noise_check\bilder\Image_230217_1227_Temp_ 42,75.png'
s = 'D:\MATLAB\noise_check\bilder\Image_230217_1227_Temp_ 42,75.png'
numS=s(end-8:end-4)
numS = '42,75'
numS2D=replace(numS,',','.'); % may be you mean this 
numD=str2double(numS2D)
numD = 42.7500