summaryrefslogtreecommitdiff
path: root/Master/texmf/doc/asymptote/examples/vectorfield3.asy
diff options
context:
space:
mode:
Diffstat (limited to 'Master/texmf/doc/asymptote/examples/vectorfield3.asy')
-rw-r--r--Master/texmf/doc/asymptote/examples/vectorfield3.asy26
1 files changed, 26 insertions, 0 deletions
diff --git a/Master/texmf/doc/asymptote/examples/vectorfield3.asy b/Master/texmf/doc/asymptote/examples/vectorfield3.asy
new file mode 100644
index 00000000000..a7bdbdb36c9
--- /dev/null
+++ b/Master/texmf/doc/asymptote/examples/vectorfield3.asy
@@ -0,0 +1,26 @@
+import graph3;
+
+size(12cm,0);
+
+currentprojection=orthographic(1,-2,1);
+currentlight=(1,-1,0.5);
+
+real f(pair z) {return abs(z)^2;}
+
+path3 gradient(pair z) {
+ static real dx=sqrtEpsilon, dy=dx;
+ return O--((f(z+dx)-f(z-dx))/2dx,(f(z+I*dy)-f(z-I*dy))/2dy,0);
+}
+
+pair a=(-1,-1);
+pair b=(1,1);
+
+triple F(pair z) {return (z.x,z.y,0);}
+
+add(vectorfield(gradient,F,a,b,red));
+
+draw(surface(f,a,b,Spline),gray+opacity(0.5));
+
+xaxis3(XY()*"$x$",OutTicks(XY()*Label));
+yaxis3(XY()*"$y$",InTicks(YX()*Label));
+zaxis3("$z$",OutTicks);