MATLAB: Select from matrix!

MATLABmatrix

could anyoen help me to understand ,what the command b will select from the matrix a ?

a=[1 3 2 ; 2 1 1 ; 3 2 3]

b= [a(1,2:3);a(2,1:2)]

Best Answer

When executing the command it outputs :

b =
     3     2
     2     1

The command :

     b= [a(1,2:3);a(2,1:2)]

selects the first line and column 2 to 3, then second line and column 1 to 2.

See here for more details.

Related Solutions

MATLAB: Take lines from array

A = repmat([1 1 1 1; 2 2 2 2; 3 3 3 3; 4 4 4 4],16,1); % Example matrix
B = zeros(32,4); % Preallocate B
B(1:2:end) = A(1:4:end,:); % Take line 1 of every 4.th line in A
B(2:2:end) = A(2:4:end,:); % Take line 2 of every 4.th line in A

results in:

A =
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
B =
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2

MATLAB: Create a matrix!

repmat(col,2,1)

repmat(col,numel(row),1)

Best Answer

Related Solutions

MATLAB: Take lines from array

MATLAB: Create a matrix!

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