How to merge rows in an array

Hi,

I have a 399x7 double array like this:

I wonder how it's possibe to create a new array with each row merged together to form an array like:

Thanks!

Answer 1

[Star Strider]

Try this:

A = randi(99, 7, 4)
Amerged = str2num(sprintf([repmat('%d',1,size(A,2)) '\n'],A.'))

producing (in this run):

A =
    53    60    11    40
    10    96    93    28
    41    43    19     4
    11    69    27    67
    12    76    79    43
    78    43    49    45
    29    65    77    61
    
Amerged =
    53601140
    10969328
     4143194
    11692767
    12767943
    78434945
    29657761

The str2double function is preferred for several reasons, however it will not work here to produce the result you want.

If you want ‘Amerged’ as a character array instead, omit the str2num call:

    Amerged = sprintf([repmat('%d',1,size(A,2)) '\n'],A.')

It is necessary to transpose the matrix (here ‘A’) to get it tyo print correctly.

[Stephen23]

sscanf is preferred over both str2double and str2num, it is much more efficient:

>> A = randi(99, 7, 4)
A =
   43   63   17   42
   46   57   12   11
   10   84   60   20
   44    1   64   32
    4   51   92   75
   34   78   18   81
   72   63   54    1
>> sscanf(sprintf([' ',repmat('%u',1,size(A,2))],A.'),'%u')
ans =
   43631742
   46571211
   10846020
    4416432
    4519275
   34781881
    7263541

[Star Strider]

@Stephen — Noted. Thank you.

[Fernando]

@Star Strider

@Stephen

Thank you!

[Star Strider]

As always, our pleasure!