reshape a matrix from the text

I am trying to reshape a matrix from the text file to 45x50 , but when i do the reshape it shows that the number of the elements should not be changes. is there any problem with my coding?

    % fileid = fopen ('2016 Sept 7 - Vortex 1_0001')
      x = textscan (fileid, '%n %n %n %n','headerlines',3,'delimiter',',')
       cc = reshape (x, 44,45)

Answer 1

[Stephen23]

A simple way to get the numeric data in one array is to use textscan's option 'CollectOutput':

[fid,msg] = fopen(...,'rt');
assert(fid>=3,msg)
opt = {'HeaderLines',3, 'Delimiter',',', 'CollectOutput',true};
C = textscan(fid,'%n%n%n%n', opt{:});
fclose(fid);
M = C{1};

Note that in this code I display the error message if fopen can't open the file, and also put the textscan options into a cell array to make them easier to keep track of.

Answer 2

[Cedric]

The output of TEXTSCAN is a row cell array with 4 cells and each one of them contains a numeric array (column vector) of 2250 values.

 >> class( x )
 ans =
     cell
 >> size( x )
 ans =
     1     4
 >> class( x{1} )
 ans =
     double
 >> size( x{1} )
 ans =
     2250           1

It is difficult to guess what you want to achieve with the reshape, but you probably want to merge the content of all cells into a 2250x4 numeric array first:

 >> data = [x{:}] ;
 >> class( data )
 ans =
     double
 >> size( data )
 ans =
     2250           4

where x{:} is a comma-separated list (CSL), [..] is a concatenation, and [x{:}] is equivalent to [x{1},x{2},x{3},x{4}].

[Stephen23]

Or just set textscan's option 'CollectOutput' to true.

[Cedric]

Stephen, move this as an answer and I vote for it ;-)