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Re: index precision issues


From: Joan Picanyol i Puig
Subject: Re: index precision issues
Date: Wed, 27 Apr 2005 00:34:19 +0200
User-agent: Mutt/1.5.6i

* Hall, Benjamin <address@hidden> [20050426 20:29]:
> How about using round to force octave to recognize your step size as an
> integer, e.g.:
> 
> >>> lsnapshots = ps (:, 1:round(model.dts / model.dt):__end__)
 
I want to protect myself from this (although I'm aware that fractional
oversampling factors are common).

> When I try to use selected samples from my long vector I get:
> 
> error: expecting integer index, found 1001.000000
> error: in /usr/home/joan/wd/simulacions--mainline--0.6--current/rx_signal.m
> near line 33, column 20:
> 
> >>> lsnapshots = ps (:, 1:model.dts / model.dt:__end__)

What is wrong in this indexing approach?

> 
> keyboard: stopped in
> /usr/home/joan/wd/simulacions--mainline--0.6--current/one_drop.m at line 33
> debug> disp(size(ps))
>         3  1000000
> debug> disp(model.dts/model.dt)
> 1000.0

This is unexplainable to me: octave complains about 1001.000000 not
being and integer index, but tells me that that value was 1000.0
instead?

tks
-- 
pica



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