problem with the setdiff function

Hello!

i have a problem here

A = 2:.1:15

B=[9.4000 10.4000]

C=setdiff(A,B)

the elements 9.4000 and 10.4000 are still in the C

however,if B=[9.3000 10.3000] then the setdiff works fine,and the elements are not in the C.

any idea why this happens?

[per isakson]

Try

    format  hex

[alex]

unfortunatelly the format hex is not working

Answer 1

[Azzi Abdelmalek]

Read this http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

[alex]

thanks for the answer,but i can't figure out what to do with my problem..

[Azzi Abdelmalek]

Use some tolerance

A = 2:.1:15
B=[9.4000 10.4000 1000]
tol=0.0001
s=abs(bsxfun(@minus,A',B))<tol
[ii,jj]=find(s==1);
A(ii)=[]

[alex]

thank you very much!

it works excellent!

Answer 2

[Jos (10584)]

A = 2:.1:15
B = [9.4000 10.4000]

D = 2 ; % number of digits that should match (e.g. 1.231 = 1.229)

C = setdiff(round(A*10^D),round(B*10^D)) ./ (10^D)

[alex]

thank you for your answer! very useful!