Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


dpb
Posts:
9,288
Registered:
6/7/07


Re: Indexing
Posted:
Mar 7, 2013 2:24 PM


On 3/7/2013 12:56 PM, Eric wrote: > dpb <none@non.net> wrote in message <kh80br$98u$1@speranza.aioe.org>... ...
>> ix=find(A==DROP,1); % the first index >> A(ix) % the value at that index >> >> NB: If A is floating point and not integervalue, the problem of exact >> comparisons for floating point values may rear its head...the values >> you've shown are integers well withing DP resolution so will be stored >> exactly, but that's not necessarily so in general of course.
> Thanks for this. You were correct that the problem of exact comparisons > for floating point values became an issue because all numbers in A were > nonintegers. I rounded the values using floor since I do not need to be > accurate to a tenths decimal place with the data I am working with.
There's a submission on the FEX that handles approximate comparisons I'm pretty sure I recall being mentioned. I don't know the name/link, but if it's a continuing issue you may want to take a look...




