Converting column vectors into 128x128 matrix to obtain a picture

Hello I am pretty new to Matlab, and I am trying to convert my data file into an 128x128 matrix in order to display an image. So, in my file I have 3 columns with 16384 numeric values in each of them, and I need to have 128x128x3 matrix, like a format of image. I was trying method reshape, but it did not work for me, I am getting an error such

Error using reshape

To RESHAPE the number of elements must not change.

Here is my code

fileID = fopen('out.txt','r');
formatSpec = '%d';
A = fscanf(fileID,formatSpec);
B = reshape (A,128,128);

Please suggest what would be the best solution for this problem.

[Walter Roberson]

At the time of the error, what shows up for

size(A)

[Danila Frolov]

49152 1

Answer 1

[Walter Roberson]

B = reshape(A,64,128,3);

Note: probably you want

B = uint8( reshape(A,64,128,3) );

It is possible you want A,128,64,3 instead of A,64,128,3 -- you will need to try both versions.

[Roger Stafford]

The easiest way of getting a 128 x 128 x 3 array is:

B = reshape(A,128,128,3);

However, the question is, does that result in a meaningful image? There are a great many way of arranging the order in your 128 x 128 x 3 array, and the above is only one of them. You need to know which of these is the correct arrangement.

[Walter Roberson]

I am not sure now why my earlier calculation had been that you needed 64*128 instead 128*128

[Danila Frolov]

Thank you @Roger Stafford and Walter Roberson, that solved my problem.