From help-octave-request at bevo dot che dot wisc dot edu Thu Jan 16 07:34:53 2003
Subject: newbie question - unsigned conversion
From: "James Ridewood" <James dot Ridewood at cern dot ch>
To: <help-octave at bevo dot che dot wisc dot edu>
Date: Thu, 16 Jan 2003 14:32:52 +0100

Hi,

Just a fairly simple one I hope:

just did this to plot a simple waveform:

x = (0:1:720)';
data = [x, sin((x-15)*(pi/180)), sin((x-105)*(pi/180)),
sin((x-135)*(pi/180)), sin((x-225)*(pi/180)), sin((x-255)*(pi/180)),
sin((x-345)*(pi/180))];
gplot [0:720] [-1.1:1.1] data with lines, data using 1:2 with lines, data
using 1:3 with lines, data using 1:4 with lines, data using 1:5 with lines,
data using 1:6 with lines, data using 1:7 with lines

I realise my code may be pretty dodgy but it does what i want. What i would
like to know now is how to change the negative half of the cycle to positive
as if rectified. multiplying by 1 doesnt seem to do it. I see there is an
ability to convert to unsigned (%u) but i'm not sure how to apply it and
even if it will do what i require.

Very grateful for any help,

Jimmy.



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