# hello guys, i have mat file < 15151x723 double > but i want this file with 3 columns only. after 15151 rows i want next 3 columns should come bellow that.same with next 3 columns ...hope you understand...

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pruth on 5 Feb 2016
Edited: pruth on 16 May 2018
hello guys, i have mat file < 15151x723 double > but i want this file with 3 columns only.
after 15151 rows i want next 3 columns should come bellow that.same with next 3 columns ...hop u understand...

Jan on 5 Feb 2016
All such resortings can be performed by:
reshape(permute(reshape()))
In you case this could be:
a = [1 2 3 4 5 6; ...
10 20 30 40 50 60; ...
100 200 300 400 500 600; ...
1000 2000 3000 4000 5000 6000]
sizeA = size(A);
b = reshape(permute(reshape(a, sizeA(1), 3, []), [2, 1, 3]), [], 3);
If this does not match your needs, play with the parameters for reshaping and permuting - there is only a limited number of possible combinations, such that you will find the solution fast.

Meghana Dinesh on 5 Feb 2016
Have you tried using reshape?
If
a =
[1 2 3 4 5 6
10 20 30 40 50 60
100 200 300 400 500 600
1000 2000 3000 4000 5000 6000]
Then
b = reshape(a,8,3)
gives:
b =
[1 3 5
10 30 50
100 300 500
1000 3000 5000
2 4 6
20 40 60
200 400 600
2000 4000 6000]
Is this what you want?
pruth on 5 Feb 2016
thank you for immediate reply see if have data
a = [1 2 3 4 5 6
10 20 30 40 50 60
100 200 300 400 500 600
1000 2000 3000 4000 5000 6000]
then i want
[ 1 2 3
10 20 30
100 200 300
1000 2000 3000
3 4 5
40 50 60
400 500 600
4000 5000 6000]
but in reality we dont know how much columns and rows we would get(it suppose to be in thousands) for eg. we have data like bellow ,
70.09 205.98 -1 70.09 205.98 -1 70.09 205.98 -1
69.84 205.21 -1 69.84 205.24 -5 69.84 205.21 -1
69.59 204.46 -1 69.59 204.46 -1 69.59 204.46 -1
69.34 203.73 -2 69.34 203.73 -8 69.34 203.73 -8
..
..
..
..
68.29 200.98 -9 68.29 200.98 -1 68.29 200.98 -2
first columns=latitude ,second=longitude, third=data. again forth columns = latitude ,fifth = longitude sixth = data... and so on.... we dont know how columns would come ,it depends on data.here i want only 3 columns,one column for latitude second for longitude and third for data. hope u understand. i m very slow in English.