From help-request at octave dot org Tue Apr 11 12:29:26 2006
Subject: Re: square waves
From: NZG <ngustavson at emacinc dot com>
To: help at octave dot org
Cc: Paul Kienzle <pkienzle at users dot sourceforge dot net>,         Doug Stewart <dastew@sympatico.ca>
Date: Tue, 11 Apr 2006 12:24:16 -0500

> What is wrong with the following?
Nothing at all, it's quite elegant actually.
thank you.

NZG
>    axis([-0.1 1.1 -1.1 1.1])
>    t=[0:0.001:1];
>
>    # A 7 Hz square wave sampled at 1kHz with a .25 duty cycle
>    plot(t,square(2*pi*t*7,0.25))
>
>    # A 7 Hz sine wave
>    plot(t,sin(2*pi*t*7))
>
> If you are using really coarse sampling then you are probably better
> off using a stem plot:
>
>    t=[0:0.01:1];stem(t,square(2*pi*t*7,0.25))
>
> Stairs is misleading because of the aliasing.
>
>    t=[0:0.01:1];stairs(t,square(2*pi*t*7,0.25))
>
> If you just want to plot the edges, then you can use e.g.,
>
>    f=7;duty=0.25;
>    t=[[0:1/f:1];[0:1/f:1]+duty/f](:);
>    stairs(t,(-1).^[0:length(t)-1])
>
> - Paul
>
>
>
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