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fec Scilab Group Scilab Function fec
NAME
fec - contour level of a function defined on a triangular mesh
CALLING SEQUENCE
fec(x,y,triangles,func,[strf,leg,rect,nax,zminmax,colminmax])
PARAMETERS
x,y : two vectors of size n, (x(i),y(i)) gives the coordinates of
node i
func : a vector of size n : func(i) gives the value of the function
for which we want the level curves.
triangles : 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 constitutes the triangle. number is
the number of the triangle and flag is an integer not used in
the fec function
strf,leg,rect,nax
: see plot2d
zminmax : useful only for animation with fec, zminmax is a vector of
size 2 [zmin zmax] which gives the z values associated with
the first and the last color (of the current colormap). (More
exactly if the colormap have nc colors and if we note dz =
(zmax-zmin)/nc, then the part of the triangulation where zmin
+ (i-1)dz <= z < zmin + i dz is filled with the color i). By
default zmin = min(func) and zmax = max(func). If you want to
do an animation with func values that varie in time, take for
zmin and zmax the global minimum and maximum or something
close. CAUTION : for func values greather than zmax the last
color is used and for func values less than zmin this is the
first color (so you don't see that the zminmax levels are
crossed).
colminmax : a vector of 2 positives integers colminmax=[colmin colmax]
with 1 <= colmin < colmax <= nc (where nc is the number of
colors of the current colormap). By default all the colors of
the colormap are used but with colminmax you may choose a
sub-part of the (current) colormap.
DESCRIPTION
See the demo files demos/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.ex2 is an example for which the mesh and the function value where
computed by an external mesh builder (amdba type mesh) and an external
program. A set of macros ( provided in file macros.sci) can be used to
read the data files in Scilab and plot the results.
SEE ALSO
Sfgrayplot, Sgrayplot
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