MATLAB: How should i subtract two matrices

matrix subtraction

i need to subtrabt the first row B with the first number A
A=[ 6 12 15]
B=[50 70 80 90
20 50 40 30 % please note that vector B is a result of a for loop
10 60 80 90]
answer [44 64 74 84
8 38 28 18
-5 45 65 75]

Best Answer

A=[ 6 12  15];
B=[50  70   80 90;
      20  50  40  30;             
      10  60  80  90];
C = B-repmat(A',1,4);
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