MATLAB: Reshaping array

arrayfortranreshapereshaping

Hi all

I have a run a program in Fortran that creates an array 40 columns by 19 rows. When I output this to an ascii file in Fortran it reads the numbers moving from left to right from each row into an array with 7 columns. This gives me an array of 7 columns by 112 rows with the last five values as Nan's in the last row.

Im using Matlab to create images with the data I have. I have been advised to import this array into Matlab and reshape this back into a 40×19 array rather than use a complicated Fortran statement to keep it formatted in the ascii file. However the Nan's give me problems with this.

So effectively what I have is something that looks like this: 14 15 16 17 18 19 20 21 22 23 24 25 26 27 … 91 92 Nan Nan Nan Nan Nan

Does anyone know how I can either keep this formatted correct using fortran or reshape this array in Matlab?

Best Answer

reshape(YourData(~isnan(YourData)), 40, 19)

Related Solutions

MATLAB: How to rearrange data in matrix rows

reshape, like pretty much all MATLAB operations, works columnwise. So you just need to transpose, reshape, transpose:

X = [20031119 1 2 3 4 5 6 7 8 9;
10 11 12 13 14 15 16 17 18 19;
20 21 22 23 24 25 26 27 28 29;
30 31 NaN NaN NaN NaN NaN NaN NaN NaN;
20031120 1 2 3 4 5 6 7 8 9;
10 11 12 13 14 15 16 17 18 19;
20 21 22 23 24 25 26 27 28 29;
30 31 NaN NaN NaN NaN NaN NaN NaN NaN];
out = reshape(X.',[],size(X,1)/4).';

creates this output matrix:

>> out
out =
 Columns 1 through 9:
   20031119          1          2          3          4          5          6          7          8
   20031120          1          2          3          4          5          6          7          8
 Columns 10 through 18:
          9         10         11         12         13         14         15         16         17
          9         10         11         12         13         14         15         16         17
 Columns 19 through 27:
         18         19         20         21         22         23         24         25         26
         18         19         20         21         22         23         24         25         26
 Columns 28 through 36:
         27         28         29         30         31        NaN        NaN        NaN        NaN
         27         28         29         30         31        NaN        NaN        NaN        NaN
 Columns 37 through 40:
        NaN        NaN        NaN        NaN
        NaN        NaN        NaN        NaN

MATLAB: Reshape an array into another

a = [1    2    3    4  5   6    7  8;...
    9   10  11 12 13 14 15 16;...
    17 18 19 20 21 22  23 24;...
    25 26 27 28 29 30 31  32];
a = [a(:,1:end/2);a(:,end/2+1:end)]

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