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Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
fchamp
direction field of a 2D first order ODE
Calling Sequence
fchamp(f,t,xr,yr,[arfact,rect,strf]) fchamp(f,t,xr,yr,<opt_args>)
Arguments
- f
An external (function or character string) or a list which describes the ODE.
- -
It can be a function name
f
, wheref
is supposed to be a function of typey=f(t,xy [p1,..pn])
.f
returns a column vector of size 2,y
, which gives the value of the direction fieldf
at pointxy=[x,y]
and at timet
.- -
It can also be an object of type list,
list(f,P1,..Pn)
wheref
is a function of typey=f(t,xy,p1,..pn)
andPi
gives the value of the parameterpi
.
- t
The selected time.
- xr,yr
Two row vectors of size n1 and n2 which define the grid on which the direction field is computed.
- <opt_args>
This represents a sequence of statements
key1=value1,key2=value2
, ... wherekey1
,key2,...
can be one of the following: arfact, rect, strf (see below).- arfact,rect,strf
Optional arguments, see
champ
.
Description
fchamp
is used to draw the direction field of a 2D first
order ODE defined by the external function f
. Note that if
the ODE is autonomous, argument t
is useless, but it must be
given.
Enter the command fchamp()
to see a demo.
Examples
Authors
J.Ph.C.
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