How do I loop through a text file and input that data into a matrix

Question

[MATLAB]

I have a text file that is a list of numbers. Below is a sample but my actual file is a list of thousands of values, each on a new line.

0.01080000000

0.00720000000

0.05760000000

0.00360000000

How do I loop through this text file and input the data into a matrix of the size x = 431 and y = 415? Again, text file just has a list so every 431st number I need to go to a new row in my matrix.

clear;

%Load in text file
filename = 'Water_1973_points.txt';
T = fopen(filename);

%Count number of points in x,y (x = 431) (y = 415)
xsize = 431;
ysize = 415;

m=zeros(xsize, ysize);
tline = fgetl(T);
for k = 1:length(T)
    for h = 1:xsize
     for j = 1:ysize
         m(h,j) =  k*255;
     end
    end
end

sco1 · Accepted Answer · 2017-12-01 01:31:29Z

1

If your file is that simple it's easy enough to just use importdata and reshape.

For example, using the following Water_1973_points.txt:

1
2
...
10

And

m = importdata('Water_1973_points.txt');
m = reshape(m, 5, 2).';  % Transpose because MATLAB is column-major

Returns:

m =

     1     2     3     4     5
     6     7     8     9    10

answered Dec 1, 2017 at 1:31

sco1

12.2k5 gold badges30 silver badges49 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How do I loop through a text file and input that data into a matrix

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related