select specific row in a matrix

A=[1;2;237;250;800;805];
B=[1,1,0.5;2,1,2;3,1,1;4,1,3;16,1,1;237,4,5;240,2,3;250,2,4;280,6,7;800,4,5;805,7,8];

I want to select A in B

result should be

New_B=[1,1,0.5;2,1,2;237,4,5;250,2,4;800,4,5;805,7,8];

I use this code

New_B=B(unique(A)==B(:,1),:)

but have this error

Matrix dimensions must agree.

Answer 1

[madhan ravi]

B(ismember(B(:,1),A),:)