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

Yann DEBRAY Wed, 07 Oct 2015 00:43:10 -0700

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-boun...@lists.scilab.org] On Behalf Of Antoine 
Monmayrant
Sent: Tuesday, October 06, 2015 10:57 AM
To: Users mailing list for Scilab <users@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,AntoineLe Mardi 6 Octobre 2015 11:42 CEST, Serge Steer < <mailto:serge.st...@inria.fr> serge.st...@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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Re: [Scilab-users] How to produce a filled staircase plot

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