make error when use isempty()

i have 2 array A and B and i need to check is item of B is available in A

i use this code but make error

code:

for k=1:length(B)
          num=B(k)
          r1=find(A==num)

            if isempty (r1)

error

Index exceeds matrix dimensions.

Error in partiton1 (line 51)
          if isempty (r1)

[Walter Roberson]

You might possibly have created a variable named "isempty"

Answer 1

[Walter Roberson]

A better way to check to see if an item in B is available in A is to use

   if ismember(B(k), A)

If you are using floating point numbers, unless the numbers were copied from A into B or copied from B into A, then B(k) might not be exactly in A, because two floating point numbers calculated different ways might have different round-off. http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F . If you want to check to see if something "close enough" to B(k) is in A, then use ismembertol()