Compare elements of an array with all elements in a matrix

I have a matrix P (18x10), and one array C (1x10). I want to compare each element of C with each element of each row in P (see if elements in C are bigger than elements in P).

(As an illustration, I want to see if: C(1)> P(1,1); C(1)> P(1,2); ... C(2)>P(2,1); C(2)>P(2,2)...).

P = randn(18,10);

C = randn(1,10);

I tried to do this as follows:

for a = 1:length(C)
    for m = 1:size(P,2)
    	for m_row = 1:size(P,1)
        		logvec= length(C(a))>P(m_row, m:end);
    	end
    end
end

I get the following error: Unable to perform assignment because the left and right sides have a different number of elements.

I expect as an output a matrix 18x10, with 0s and 1s.

I'd appreciate your help! Thank you!

Answer 1

[KSSV]

No loop needed. You can use straight away like shown:

P = randn(18,10);
C = randn(1,10);
C1 = repmat(C,18,1) ; 

idx = C1 > P 

[Chunru]

even repmat is not needed as array will be automatically expanded.

[Arlinda Gashi]

This just made my life way easier :) !

Thanks a lot!

[KSSV]

@Chunru yes you are right. It is redundant. Can be removed.

Answer 2

[Chunru]

P = randn(5,4)

P = 5×4

0.4430 1.0634 -0.8297 -0.4101 -1.1517 -2.1151 1.2150 0.3174 1.2722 1.9258 -2.0465 -0.1428 0.2521 1.2782 -0.3429 -0.4121 0.4291 0.8109 -1.9595 -0.0784

C = randn(1,4)

C = 1×4

1.3790 -1.2752 -0.2469 -0.1746

lv = C > P

lv = 5×4 logical array
   1   0   1   1
   1   1   0   0
   1   0   1   0
   1   0   1   1
   1   0   1   0

[Arlinda Gashi]

Amazing! Thanks a lot!