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In fact, I haven't written informations about the command fec
fec is used to plot contour level of a function defined
on a mesh constituted of triangles
and assuming that f is linear on triangles
The best way to undersantd how it works is to look at the two demo
files in demos/fec ( and source code for fec in routines/graphics/Fec )
===================================================================
fec.ex1 is a simple demo file in which a mesh and a function
on that mesh is completely built in Scilab syntax
Fec is used as folows :
let no be the number of nodes
and Ntr the number of traiangles
fec(x,y,triangles,func,no,Ntr,strflag,legend,brect,aaint)
x and y are two vectors of size no
(x(i),y(i)) gives the coordinates of node i
func is also a vector of size no :
func(i) gives the value of the function for which we want
the level curves.
trianles : is a [Ntr,5] matrix
each line of triangles specifies a triangle of the
mesh
triangle(j) = [number,node1,node2,node3,flag]
node1,node2,node3 : are the number of the nodes
which constitues triangle(j)
number : is the number of the triangle
flag is an integer not used in the fec function
for the remaining arguments
strflag,legend,brect,aint : see plot2d
===================================================================
fec.ex2 is an example for which the mesh and the function value where
computed by an external `mesh builder (amdba type mesh) and external program
A set of macros ( provided in file fec_demos.sci) were used to read the to data files in Scilab
and plot the results
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