Question

I have over a thousand matrices (6 x 2000, ASCII files, comma delimited) that I generated from MATLAB. I want to get the last row of each matrix / text file and save them in a new matrix / text file. The text files have crazy names so when I load them I can name them whatever. Right now I would do this to achieve my goal:

% A = load('crazyname.txt');
% B = load('crazynameagain.txt');
% C = load('crazynameyetagain.txt');

A = [5 5 5; 5 5 5; 1 1 1];
B = [5 5 5; 5 5 5; 2 2 2];
C = [5 5 5; 5 5 5; 3 3 3];

D(1,:)=A(end,:);
D(2,:)=B(end,:);
D(3,:)=C(end,:);

I will create each command (e.g. load, building D step by step) in Excel by combining text cells to create a command. Is there a better way to do this? Could I load / assign the matrices with a name that would better suit them to be used in a for loop? Or is some other MATLAB command that would facilitate this?

Thanks.

Answer 1

Suppose, you have all the csv files in folder d:/tmp, each contains 6x2000:

folder = 'd:/tmp';
files = dir(fullfile(folder, '*.csv'));
res = cell2mat(cellfun(@(x) csvread(fullfile(folder, x), 5, 0), {files.name}', 'UniformOutput', false));

Note the arguments of csvread().

Edit: if the delimiter is space ' ':

res = cell2mat(cellfun(@(x) dlmread(fullfile(folder, x), ' ', 5, 0), {files.name}', 'UniformOutput', false));