[Scilab-users] How to produce a filled staircase plot

[Yann DEBRAY]

Hello Raphael,

Nice plot, but sadly it doesn't rescale.
Do you have an idea how to make it fit the axes, to rescale automatically?

Yann

Le 07/10/2015 00:17, Rafael Guera a écrit :
> Hello Antoine,
>   
> An attempt below, not particularly clean but I hope not too dirty either:
>   
> //INPUT
> t = [ 0  2  5 10 12 17 20 30 35 45 60]'*0.1;
> N = [20 18 15 14 12  9  6  4  3  2  1]';
>   
> t2=[];N2=[];
> ns= length(t);
> t2(1:2:2*ns) = t;
> t2(2:2:2*ns) = [t(2:$)-%eps; t($)];
> N2(1:2:2*ns-1) = N;
> N2(2:2:2*ns) = N;
> clf;
> xfpoly([t2(1)-%eps;t2;t2($)+%eps],[0;N2;0]);
> h = gce();
> h.line_mode = "off";
> h.background = color('gray');
> plot(t2,N2,'black', t2,21*exp(-t2/2),'red');
>   
>   
> Regards,
>   
> Rafael
>   
> -----Original Message-----
> From: users [mailto:users-bounces at lists.scilab.org] On Behalf Of Antoine Monmayrant
> Sent: Tuesday, October 06, 2015 10:57 AM
> To: Users mailing list for Scilab <users at lists.scilab.org>
> Subject: Re: [Scilab-users] How to produce a filled staircase plot
>   
> Thank you Serge for this solution, but it does not work for me: the "bars" in my case are not regular.
> I am simulating an exponential random decay: starting from a number N0, my population decreases by jumps of N0->N0-1 that occur at random times, following an exponential law (see the attached plot).
> For the moment, I just build my polygon by hand, but it adds quite a lot of "noise" on top of the code that I intent to show to my students.
> I was hoping for a cleaner solution.
>   
> Thanks anyway,
>   
> Cheers,
>   
> Antoine
>   
> Le Mardi 6 Octobre 2015 11:42 CEST, Serge Steer < <mailto:Serge.Steer at inria.fr> Serge.Steer at inria.fr> a écrit:
>   
>> Le 06/10/2015 00:01, Antoine Monmayrant a écrit :
>>> Hi everyone,
>>>
>>> I'm trying to do a filled staircase plot (ie a staircase where the area between the staircase and the x axis is filled with a solid color).
>>> Is there a given combination of polyline_style and fill_mode, etc ... that can do this?
>>> Or should I resort to building a polygon by hand?
>>>
>>> Thanks in advance,
>>>
>>> Antoine
>>>
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>> May be the bar mode can help you
>> x=linspace(0,%pi,10);y=sin(x);
>> clf;plot(x,y);e=gce();e=e.children;
>> e.polyline_style=6;e.bar_width=0.5;
>> e.background=2;
>> e.line_mode="off";
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