subtracting columns of one matrix from the other and chaining the awnsers

i have a matrix A=[1,2,3; 4,5,6 ; 7,8,9] and matrix B=[10,20,30,40; 10,20,30,40; 10,20,30,40]

i want to substract A(:,1)-B and chain it to A(:,2)-B and so on.

without using a loop!

any ideas??

Answer 1

[Image Analyst]

What is your definition of "chain"? Do you mean concatenate?

A(:, 1) is a column vector while B is a matrix. Were you planning on using automatic expansion?

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

A = 3×3

1 2 3 4 5 6 7 8 9

B=[10,20,30,40; 10,20,30,40; 10,20,30,40]

B = 3×4

10 20 30 40 10 20 30 40 10 20 30 40

% "i want to substract A(:,1)-B and chain it to A(:,2)-B and so"
m1 = A(:,1) - B

m1 = 3×4

-9 -19 -29 -39 -6 -16 -26 -36 -3 -13 -23 -33

m2 = A(:, 2) - B

m2 = 3×4

-8 -18 -28 -38 -5 -15 -25 -35 -2 -12 -22 -32

% Concatenate m1 to the right of m2
output = [m2, m1]

output = 3×8

-8 -18 -28 -38 -9 -19 -29 -39 -5 -15 -25 -35 -6 -16 -26 -36 -2 -12 -22 -32 -3 -13 -23 -33