How to solve a subscript problem by creating a matrix from x,y-arrays?

3 次查看（过去 30 天）
Emerson De Souza
Emerson De Souza 2012-11-9
Hi, I use the script below to create two x,y-arrays and to build a matrix with the transposed y-columns of the arrays. Each array correspond to a row of the matrix. (I create, save and import again only to simulate a real situation because I have i-arrays of collected data)
% CREATE ARBITRARY X,Y-ARRAYS:
X1=(3:1:5)';
Y1=rand(1,length(X1))';
M1=[X1 Y1];
X2=(1:1:6)';
Y2=rand(1,length(X2))';
M2=[X2 Y2];
% SAVE I.txt AND IMPORT NEXT TO SIMULATE THE REAL PROBLEM
fid = fopen('1.txt', 'wt');
fprintf(fid, [repmat('%g\t', 1, size(M1,2)-1) '%g\n'], M1.');
fclose(fid);
fid = fopen('2.txt', 'wt');
fprintf(fid, [repmat('%g\t', 1, size(M2,2)-1) '%g\n'], M2.');
fclose(fid);
% CONSTRUCT MATRIX
i=2; % Number of rows (=NUMBER OF FILES)
j=10; % Number of columns (=MIN AND MAX RANGE OF X FOUND IN ALL i.txt FILES)
M = NaN(i,j); % preallocates matrix for speed
for filenumber = 1:i;
fid =fopen(['C:\Users\Emerson\Desktop\',num2str(filenumber),'.txt']);
A=textscan(fid,'%f %f');
fclose(fid);
A = cell2mat(A);
M(filenumber,A(:,1)) = A(:,2);
end
The script works well for entire increment (in the case above 1). The cells m13, m14 and m15 have a value following the range of 1.txt.
In the same way the values of the second row depends on the new range of 2.txt. One can change the ranges of 1.txt (=M1) and 2.txt(=M2) by varying X1 and X2 above and the matrix will adjust accordingly.
Problem: My real i.txt arrays have increments of 0.5 and if I change the increment above I obtain the following error:
Subscript indices must either be real positive integers or logicals.
I wonder if someone could help me to fix this.
Thank you in advance for your help.
Emerson

请先登录，再回答此问题。

采纳的回答

bym
bym 2012-11-9
perhaps something like this
for filenumber = 10:5:i*10;
fid =fopen(['C:\Users\Emerson\Desktop\',num2str(filenumber/10),'.txt']);
...
end
or perhaps using the dir command
files = dir('C:\Users\Emerson\Desktop\*.txt');
for filenumber = 1: length(files)
...
end

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Operators and Elementary Operations 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by