MATLAB: How to extract a number from a string

extractnumeric

Good afternoon. I have the following problem. I have a matrix of type "Cell" in which there is data of type "string", said data is composed of a non-numeric character (a – U-) and a numeric character. I want to extract the numeric character of each of the cells in the matrix. Below I leave some images of how my matrices are made.
1.png
I want to extract the numerical values ​​of all the "cells" of the last column.
the matrix is ​​named "Yp_c"
Thank you.

Best Answer

Try this %%-section by section
%%





cac = { 123, 'U 2'; 'Mod3', 789 }; % Sample data

%%
isx = cellfun( @(chr) isa(chr,'char'), cac );
%% 

buf = regexp( cac(isx), '\d+', 'match' ); 
num = cellfun( @str2double, buf, 'uni',false );
%%
cac(isx) = num;
and peek on the result
>> cac
cac =
  2×2 cell array
    {[123]}    {[  2]}
    {[  3]}    {[789]}
>>
After reading "all the "cells" of the last column" more carefully
%%
cac = { 123, 'U 2'; 'Mod3', [] }; % Sample data
%%
isx = cellfun( @(chr) isa(chr,'char'), cac(:,end) );
%% 
buf = regexp( cac(isx,end), '\d+', 'match' ); 
num = cellfun( @str2double, buf, 'uni',false );
%%
cac(isx,end) = num;
and peek on the result
>> cac
cac =
  2×2 cell array
    {[ 123]}    {[       2]}
    {'Mod3'}    {0×0 double}
/ R2018b
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