Re: 3D plot from a matrix

[guido.bonalumi]

Yes I think so, but I am not sure. I am trying to implement /quiver/ in my
code but I am having some troubles with the vectors /u/ and /v/.

Here is my code:

/X=[0, 6.8, 13.6, 20.4, 27.2, 34, 40.7, 47.5, 52.1, 56.6, 61.1, 65.6, 67.9];
X=X/(2*max(X));
Y=linspace(0,1,30);
Z=load("data.dat");
[XX YY]=meshgrid(X,Y);
save("-ascii", "matrix", '[XX YY]');
map=jet(256);
colormap (map);
surf(YY,XX,Z);
shading interp;

#title("Vista frontale");
xlabel("tg");
ylabel("rad");
colorbar("EastOutside");
view(2)
print -color perdite3D_vista_frontale.eps

#title("Vista in prospettiva");
xlabel("tg");
ylabel("rad");
zlabel("\\zeta");
colorbar("EastOutside");
view (25, 30);
print -color perdite3D.eps/

I am plotting a coefficient (Kinetic Energy Loss Coefficient) which is saved
in the file "data.dat" for each point defined by an couple of coordinates
(X, Y). For each point I know the three components of the Mach number and so
I created two matrix: one for the tangential coordinate and another one for
the radial (and saved them in two file: "tg.dat" and "rad.dat"). Then I
tried with this:
/
tg=("tg.dat");
rad=("rad.dat");
h=quiver(XX, YY, tg, rad);
set(h, "maxheadsize", 0.33);/

I have two problem:

- the result is not what I was expecting and it does not agree with my
vortex;
- /quiver/ create another graph while I want that these vectors show up in
my graph (the one that show the vortex), like two overlapping layers.

Any idea?



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