how to define a matrix element in matlab

any help please , I need to replace the first colunm in matrix with diffrent size by another value!!!

as example :

input

A=[1 2; 3 4];

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

Output

B=[1 2; 3 4 ;9 1; 1 4]

Answer 1

[Matt J]

B(1:2,1:2)=A

Answer 2

[Torsten]

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

B = 4×2

1 2 3 4 9 1 1 4

Answer 3

[Image Analyst]

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