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Re: How to plot multiple variables in scrolling window


From: Juan Pablo Carbajal
Subject: Re: How to plot multiple variables in scrolling window
Date: Mon, 14 Jul 2014 10:59:38 +0200

On Mon, Jul 14, 2014 at 9:17 AM, Helios de Rosario
<address@hidden> wrote:
>>>> El día 11/07/2014 a las 1:31, jmb <address@hidden> escribió:
>> I am trying to make octave plot more than one variable in a
>> 'pseudo‑scrolling' manner using the code I found at:
>>
>> http://octave.1599824.n4.nabble.com/plot‑in‑a‑for‑loop‑td3331507.html
>
>> N = 200;
>> figure (1)
>> x = 0:(N‑1);
>> y = rand(1, length(x));
>> plot(x(1), y(1));
>> axis([0 N 0 1]);
>> vh = get(gca,'children');
>> for i=1:length(x)
>>    set(vh, 'xdata',x(1:i), 'ydata', y(1:i));
>>    pause(10);
>> endfor
>>
>> which works for one variable 'y'
>>
>> Then I have tried some variations of the above for 2 variables, but
> have
>> been unsuccessful.  Can somebody suggest how it can be done?
>
> The following should work:
>
> N = 200;
> figure (1)
> x = 0:(N-1);
> # Use sine and cosine for clearer plots
> y1 = sin(pi/100*x);
> y2 = cos(pi/100*x);
> hold on
> plot(x(1), y1(1), '.-b');
> plot(x(1), y2(1), '.-r');
> axis([0 N -1 1]);
> vh = get(gca,'children');
> for i=1:length(x)
>    set(vh(1), 'xdata',x(1:i), 'ydata', y1(1:i));
>    set(vh(2), 'xdata',x(1:i), 'ydata', y2(1:i));
>    pause(0.10);
> endfor
>
>
> Plotting over the previous lines (as suggested by Kai) looks the same,
> but overloads the axes with superimposed, unncecessary objects, and it
> may work slower -- very slow, for too many data.
>
> Helios
>
>
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Maybe this code is helpful.
http://agora.octave.org/snippet/dW3e/



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