MATLAB: How tonsert Column and Row in all dimensions of a matrix

matrix

For Example I have a matrix-

A = [1 2 3; 4 5 6; 7 8 9]

now i need a matrix

   B = [1 1 1 1 1;1 1 2 3 1;1 4 5 6 1; 1 7 8 9 1; 1 1 1 1 1]

Means i need to add an equal number of elements around the matrix. Thanks in advance.

Best Answer

[rows, cols] = size(A);
B = [ones(1, cols+2); ones(rows, 1), A, ones(rows, 1); ones(1,cols+2)]

Alternately if you have the Image Processing Toolbox,

B = padarray(A,[1,1],1);

Related Solutions

MATLAB: Append rows at the end of Matrix

a = [1 2 3 ; 4 5 6; 7 8 9];
b=[5 5 5]  
c=[a;b]% add one row
c=[a;repmat(b,7,1)]  %add 7rows

MATLAB: Managing maximum and minimum values in the elements of an matriz.

This should work. The idea is to first find out the base number, adjust the offset if needed, and add the base back.

A = [2.1  3.0  4.4  5.5   6.1
    2.3   3.2   4.2   5.4   6.3
    2.1   3.1   4.1   5.2   6.2
    2.2   3.1   4.1   5.1   6.6
    2.0   3.3   4.3   5.3   6.4];
lim=0.1;
base=repmat(1+(1:size(A,2)),size(A,1),1);
dist_to_base=A-base;
dist_to_base(dist_to_base<=   lim   )=lim;
dist_to_base(dist_to_base>= (1-lim) )=1-lim;
B=base+dist_to_base;

Best Answer

Related Solutions

MATLAB: Append rows at the end of Matrix

MATLAB: Managing maximum and minimum values ​​in the elements of an matriz.

Related Question

MATLAB: Managing maximum and minimum values in the elements of an matriz.