MATLAB: To operate a function in all rows of matrix

functionMATLABmatlab functionmatrixmatrix arraymatrix manipulation

How I can repeat a function irrespective a size of matrix? For example, I have a matrix A and I want calculate the difference between maximum and minimum values in all rows, without I have determine the number of rows in my function, because I have began to set the function, but I just get the function works writtening a number of each row. Thank you!

A =

66 94 75 18

4 68 40 71

85 76 66 4

Best Answer

The range() function computes the difference between max and min values. When the input is a matrix, it acts on the columns. To act on the rows, just transpose the matrx. I added a second transpose so the results are in a column.

maxMinDiff = range(A')'
maxMinDiff =
    76
    67
    81

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MATLAB: How to make each pair of pixels from the matrix in a row major order

Hello Subroto. I have used a couple of steps to convert A into a vector of paired up pixels and stored it in A_paired.

>> A=[43   36   31   35   35   29   29   25
      33   33   32   29   25   25   22   22
      33   33   31   32   31   27   25   29
      28   33   35   27   25   29   32   51
      23   26   30   38   31   43   47   57
      27   29   30   37   40   52   63   61
      23   24   32   42   52   62   72   66
      24   30   44   54   65   71   70   74 ];
>> A_transpose = A';
>> A_vector = A_transpose(:);
>> A_paired = reshape(A_vector, 2, length(A_vector) / 2)'
A_paired =
    43    36
    31    35
    35    29
    29    25
    33    33
    32    29
    25    25
    22    22
    33    33
    31    32
    31    27
    25    29
    28    33
    35    27
    25    29
    32    51
    23    26
    30    38
    31    43
    47    57
    27    29
    30    37
    40    52
    63    61
    23    24
    32    42
    52    62
    72    66
    24    30
    44    54
    65    71
    70    74

I hope this was helpful. :)

MATLAB: How to find min or max value in each row of a matrix and its index, if a matrix is 3×2 it will find the min in first row

Use

 [val,loc] = min(R')
 val =
    21    35    42   % min value in each row
 loc =
     3     1     1   % column location of min value

Best Answer

Related Solutions

MATLAB: How to make each pair of pixels from the matrix in a row major order

MATLAB: How to find min or max value in each row of a matrix and its index, if a matrix is 3×2 it will find the min in first row

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