delete a row with condition

Let's say:

 A=[ 1  222        ----> labelling "1"    
     2  555        ----> labelling "2"  
     3  999        ----> labelling "3"  
     4  3333       ----> labelling "4"  
     6  111        ----> labelling "5"  
     7  5000       ----> labelling "6"  
     8  2000]      ----> labelling "7"

and

 B=[ 3; 7];

I wanna delete the row in matrix A in which the first column have the same value as value in matrix B

The result (C) will as follow:

 A=[ 1  222           
     2  555        
     3  999        ----> delete this row 
     4  3333         
     6  111         
     7  5000       ----> delete this row   
     8  2000]

Ww have:

 C=[ 1  222           
     2  555             
     4  3333        
     6  111          
     8  2000]

How to do it?

Answer 1

[Image Analyst]

Use ismember() to figure out what rows, then [] to extract all but those rows

A=[ 1  222
  2  555
  3  999        %----> delete this row
  4  3333
  6  111
  7  5000       %----> delete this row
  8  2000]

B=[ 3 7];
[ia, ib] = ismember(A(:, 1), B)
A = A(~ia, :)