Extract numbers out of a .mat file that has both characters and numbers

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Karthik 2015-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/230160-extract-numbers-out-of-a-mat-file-that-has-both-characters-and-numbers

编辑： Stephen23 2015-7-17

采纳的回答： Azzi Abdelmalek

text.mat

Hi, How can I extract numbers out of this .mat file ? Thanks.

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Answer 1

Azzi Abdelmalek 2015-7-17

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https://ww2.mathworks.cn/matlabcentral/answers/230160-extract-numbers-out-of-a-mat-file-that-has-both-characters-and-numbers#answer_186311

编辑：Azzi Abdelmalek 2015-7-17

在 MATLAB Online 中打开

a=regexp(text,'(?<==)\d+(.)?(\d+)?','match','once')
id=~cellfun(@isempty,a(:,1))
a=str2double(a(id))

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Karthik 2015-7-17

Hi, Thanks. The numbers like 2.3*e-4 are being read as 2.3. Not producing the exact numbers. Can you let me know how to fix it.

Stephen23 2015-7-17

编辑：Stephen23 2015-7-17

Standard scientific notation using "E" syntax does not use any multiplier symbol, so your source data is non-standard and therefore MATLAB does not recognize it. Therefore you basically have two choices:

Change the source data to use standard E-notation.
Read the data into MATLAB as strings, and then do some hackery using regexprep before converting to numeric.

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