MATLAB: Add 2 to the element in the 2nd row and 3rd column of given matrix.

addelement in columnelement in row

Hi!

The matrix is A=[1 3 4 2;2 0 1 6;4 1 2 7;0 3 6 4]

Add 2 to the element in the 2nd row and 3rd column of given matrix.

Best Answer

A(2,3) gives you the element in the 2nd row, 3rd column. To manipulate that value while leaving the other values of A the same,

A(2,3) = A(2,3)+2

This is Matlab 101. You'll greatly benefit from taking time to read about indexing in matlab.

https://www.mathworks.com/help/matlab/math/array-indexing.html

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MATLAB: Swap rows and columns of a matrix

x = [2 1 3];
A_New = A(x,x);

MATLAB: Random matrix with maximum values.

You could do this:

w = floor(sqrt(30))
rows = 1 : w
counter = 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;
	end
end

You'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 =

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.

Best Answer

Related Solutions

MATLAB: Swap rows and columns of a matrix

MATLAB: Random matrix with maximum values.

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