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MATLAB: I have a matrix of 5 rows and 3 columns and i want to select only 1st 3rd and 4th row with all column using an array how to do it?whats the script
arrayMATLABmatrixmatrix array
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You could do this:
w = floor(sqrt(30))rows = 1 : wcounter = 1;for k = 1 : length(rows) columns(k) = floor(30/rows(k)); for col = 1 : columns(k) fprintf('For %d rows, and %d columns, there are %d elements.\n',... rows(k), col, rows(k) * col); allMatrices{counter} = rand(rows(k), col); counter = counter + 1; endendYou'll get every possible matrix size with 30 or fewer elements in it. And each one will be a cell in the allMatrices cell array. It has to be a cell array rather than a 3-D matrix because the matrices are not all the same size. You'll see in the command window:
w =
5
rows =
1 2 3 4 5
For 1 rows, and 1 columns, there are 1 elements.
For 1 rows, and 2 columns, there are 2 elements.
For 1 rows, and 3 columns, there are 3 elements.
For 1 rows, and 4 columns, there are 4 elements.
For 1 rows, and 5 columns, there are 5 elements.
For 1 rows, and 6 columns, there are 6 elements.
For 1 rows, and 7 columns, there are 7 elements.
For 1 rows, and 8 columns, there are 8 elements.
For 1 rows, and 9 columns, there are 9 elements.
For 1 rows, and 10 columns, there are 10 elements.
For 1 rows, and 11 columns, there are 11 elements.
For 1 rows, and 12 columns, there are 12 elements.
For 1 rows, and 13 columns, there are 13 elements.
For 1 rows, and 14 columns, there are 14 elements.
For 1 rows, and 15 columns, there are 15 elements.
For 1 rows, and 16 columns, there are 16 elements.
For 1 rows, and 17 columns, there are 17 elements.
For 1 rows, and 18 columns, there are 18 elements.
For 1 rows, and 19 columns, there are 19 elements.
For 1 rows, and 20 columns, there are 20 elements.
For 1 rows, and 21 columns, there are 21 elements.
For 1 rows, and 22 columns, there are 22 elements.
For 1 rows, and 23 columns, there are 23 elements.
For 1 rows, and 24 columns, there are 24 elements.
For 1 rows, and 25 columns, there are 25 elements.
For 1 rows, and 26 columns, there are 26 elements.
For 1 rows, and 27 columns, there are 27 elements.
For 1 rows, and 28 columns, there are 28 elements.
For 1 rows, and 29 columns, there are 29 elements.
For 1 rows, and 30 columns, there are 30 elements.
For 2 rows, and 1 columns, there are 2 elements.
For 2 rows, and 2 columns, there are 4 elements.
For 2 rows, and 3 columns, there are 6 elements.
For 2 rows, and 4 columns, there are 8 elements.
For 2 rows, and 5 columns, there are 10 elements.
For 2 rows, and 6 columns, there are 12 elements.
For 2 rows, and 7 columns, there are 14 elements.
For 2 rows, and 8 columns, there are 16 elements.
For 2 rows, and 9 columns, there are 18 elements.
For 2 rows, and 10 columns, there are 20 elements.
For 2 rows, and 11 columns, there are 22 elements.
For 2 rows, and 12 columns, there are 24 elements.
For 2 rows, and 13 columns, there are 26 elements.
For 2 rows, and 14 columns, there are 28 elements.
For 2 rows, and 15 columns, there are 30 elements.
For 3 rows, and 1 columns, there are 3 elements.
For 3 rows, and 2 columns, there are 6 elements.
For 3 rows, and 3 columns, there are 9 elements.
For 3 rows, and 4 columns, there are 12 elements.
For 3 rows, and 5 columns, there are 15 elements.
For 3 rows, and 6 columns, there are 18 elements.
For 3 rows, and 7 columns, there are 21 elements.
For 3 rows, and 8 columns, there are 24 elements.
For 3 rows, and 9 columns, there are 27 elements.
For 3 rows, and 10 columns, there are 30 elements.
For 4 rows, and 1 columns, there are 4 elements.
For 4 rows, and 2 columns, there are 8 elements.
For 4 rows, and 3 columns, there are 12 elements.
For 4 rows, and 4 columns, there are 16 elements.
For 4 rows, and 5 columns, there are 20 elements.
For 4 rows, and 6 columns, there are 24 elements.
For 4 rows, and 7 columns, there are 28 elements.
For 5 rows, and 1 columns, there are 5 elements.
For 5 rows, and 2 columns, there are 10 elements.
For 5 rows, and 3 columns, there are 15 elements.
For 5 rows, and 4 columns, there are 20 elements.
For 5 rows, and 5 columns, there are 25 elements.
For 5 rows, and 6 columns, there are 30 elements.
>> x = [1,2,3,4,5;6,7,8,9,10;11,12,13,14,15]x = 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15>> x([1,4,11,14]) = x([11,14,1,4])x = 9 10 3 4 5 6 7 8 1 2 11 12 13 14 15You can easily generate those linear indices with sub2ind.
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