Technical Solutions

Why does COLON return a vector that does not seem to be correct?

Date Last Modified: Friday, June 26, 2009

Solution ID:		1-536MAS
Product:		MATLAB
Reported in Release:		No Release
Platform:		All Platforms
Operating System:		All OS

 

Subject:

Why does COLON return a vector that does not seem to be correct?

Problem Description:

When I create a vector using the COLON operator or the LINSPACE function, and then compare one of the elements to a variable with the same value, they are not equal. For example:
a = 0:0.1:1;
a(4)==0.3


ans =

     0

Solution: This behavior is related to floating-point arithmetic and the way numbers are represented in a computer. For more information on this subject, see the related Solution below.

 

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