# Extracting the numbers from file names and listing them in a column

3 views (last 30 days)
Babu Sankhi on 21 Jan 2021
Commented: Babu Sankhi on 22 Jan 2021
Hi all ,
I have png files like this ;
Rpma26siatBz 9.500000 Bx 0.000000mT WWait 2.000000Sec.Bzat9.5mT83.png,
Rpma26siatBz 9.500000 Bx 100.000000mT WWait 1.000000Sec.Bzat9.5mT85.png
and so on
I want to extract numbers 0.000000 from first file ,100.000000 from second file etc .and put in one column.
And again extract the numbers 2.000000 from first file,1.000000 from second file etc. and put in another column.
I tried writing the code like this but it didnt work ( I mean I got NAN)? It would be great if you share any ideas for doing it .
thank you
clear all;
close all;
clc;
listI=dir('*.png');
B=[];
for i=1:length(listI);
n=listI(i);
A1 =n(1:end-26);
A2 = n(1:end-19);
x1= str2double(A1);
x2=str2double(A2);
Bx=[B;(x1),(x2)];
end

Stephen23 on 21 Jan 2021
Edited: Stephen23 on 21 Jan 2021
C = {'Rpma26siatBz 9.500000 Bx 0.000000mT WWait 2.000000Sec.Bzat9.5mT83.png',...
'Rpma26siatBz 9.500000 Bx 100.000000mT WWait 1.000000Sec.Bzat9.5mT85.png'};
M = sscanf([C{:}],'Rpma%*dsiatBz%*f Bx%fmT WWait%fSec.Bzat%*fmT%*d.png',[2,Inf]).'
M = 2×2
0 2 100 1
Or
W = regexp(C,'(?<=\s)\d+\.\d+(?=[A-Za-z])','match');
M = str2double(vertcat(W{:}))
M = 2×2
0 2 100 1
Babu Sankhi on 22 Jan 2021

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