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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: if statement
Replies: 3   Last Post: Aug 20, 2013 12:48 PM

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Alan

Posts: 48
Registered: 7/30/13
Re: if statement
Posted: Aug 20, 2013 12:11 PM
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"Roger Stafford" wrote in message <kv03b8$mcl$1@newscl01ah.mathworks.com>...
> "S C.Carl" wrote in message <kuvtvb$gv5$1@newscl01ah.mathworks.com>...
> > a =
> > 0.0188
> > b =
> > 0.0188

> - - - - - - - - -
> The fact that the 'format short' displays of a and b are the same doesn't mean that a and b are equal. That display is rounded off to four decimal places and they could very easily be unequal. I suggest you try 'format hex' on them.
>
> Roger Stafford


With the data that you've given, your if statement could just as easily be

if abs(a-b) < 0.0001

It all depends on how exact you want to be, but matlab is able to carry a lot of places pass the decimal



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