MATLAB: How is this simple code read

MATLABsimple

My code is as follows :

mat = [1 2 3 ; 4,5,6 ; 7 8 9];
mat([2 3], [2 3])

Question: Why is the output

5   6
8   9

and how is that determined?

Best Answer

It is the 2nd & 3rd rows and the 2nd & 3rd columns of the matrix mat. The syntax is simply extracting a sub-matrix of the original.

Related Solutions

MATLAB: Is it possible to extract the values with a vector of indices for each row without using the for statement from the matrix

see sub2ind()

A = [1, 2, 3; 4, 5, 6; 7, 8, 9; 10, 11, 12]; % reference matrix
b = [2; 1; 1; 3]; % index for each row that I want to extract
idx = sub2ind(size(A), 1:size(A,1), b.');
A(idx)

Result

>> A(idx)
ans =
     2     4     7    12

MATLAB: Simple question

using

ChangesN = find(diff(S))

would demonstrate where the value was changing and then to see how many time this happens:

length(ChangesN)

Best Answer

Related Solutions

MATLAB: Is it possible to extract the values with a vector of indices for each row without using the for statement from the matrix

MATLAB: Simple question

Related Question