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generate multiple text files from a matrix

조회 수: 25(최근 30일)
fadzhi
fadzhi 15 Jan 2021
댓글: Jon 15 Jan 2021
Hi all,
i have a 1000 x 2 matrix and i want to generate 1000 text files with two lines with first entry from first colum of matrix and second from second (for first files and so on till 1000). Will appreciate any help in this regard
a = 1...1000
b = 1001...2000
txt1= (1,10001)
....
......
txt1000 = (1000, 2000)

채택된 답변

Mathieu NOE
Mathieu NOE 15 Jan 2021
hello
see below
data = [(1:1000)' 1000+(1:1000)'];
for ci = 1: size(data,1)
str = ['(' num2str(data(ci,1)) ',' num2str(data(ci,2)) ')'];
filename = ['file_out' num2str(ci) '.txt'];
writematrix(str, filename,"QuoteStrings",0);
end

추가 답변(1개)

Jon
Jon 15 Jan 2021
While I was working on this I see you have already received an answer. This is probably similar to what Mathieu has already submitted, but since I had already spent time preparing it I'll provide it as an alternative. I like to put leading zeros on my filenames e.g. txt00001.csv, txt0002.csv, ... txt0999.csv, txt1000.csv as you can then easily retrieve them in alphabetical (dictionary) order.
baseName = 'txt'
A = rand(1000,2)
% loop through data making individual files for each row
numRows = size(A,1);
for k = 1:numRows
% build filename % e.g. txt083.csv
filename = [baseName,num2str(k,'%04d'),'.csv'];
% write data to file
writematrix(A(k,:),filename)
end
  댓글 수: 1
Jon
Jon 15 Jan 2021
By the way, I wonder why you are creating so many smaill files. Often there is a more efficient alternative, but I can't offer any suggestions without knowing what your overall problem is

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