summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/doc/asymptote/examples/imagehistogram.asy
diff options
context:
space:
mode:
Diffstat (limited to 'Master/texmf-dist/doc/asymptote/examples/imagehistogram.asy')
-rw-r--r--Master/texmf-dist/doc/asymptote/examples/imagehistogram.asy47
1 files changed, 47 insertions, 0 deletions
diff --git a/Master/texmf-dist/doc/asymptote/examples/imagehistogram.asy b/Master/texmf-dist/doc/asymptote/examples/imagehistogram.asy
new file mode 100644
index 00000000000..d3bdc783757
--- /dev/null
+++ b/Master/texmf-dist/doc/asymptote/examples/imagehistogram.asy
@@ -0,0 +1,47 @@
+import stats;
+import graph;
+import palette;
+import contour;
+
+size(20cm);
+
+scale(false);
+
+pair[] data=new pair[50000];
+for(int i=0; i < data.length; ++i)
+ data[i]=Gaussrandpair();
+
+// Histogram limits and number of bins
+pair datamin=(-0.15,-0.15);
+pair datamax=(0.15,0.15);
+int Nx=30;
+int Ny=30;
+
+int[][] bins=frequency(data,datamin,datamax,Nx,Ny);
+
+real[] values=new real[Nx*Ny];
+pair[] points=new pair[Nx*Ny];
+int k=0;
+real dx=(datamax.x-datamin.x)/Nx;
+real dy=(datamax.y-datamin.y)/Ny;
+for(int i=0; i < Nx; ++i) {
+ for(int j=0; j < Ny; ++j) {
+ values[k]=bins[i][j];
+ points[k]=(datamin.x+(i+0.5)*dx,datamin.y+(j+0.5)*dy);
+ ++k;
+ }
+}
+
+// Create a color palette
+pen[] InvGrayscale(int NColors=256) {
+ real ninv=1.0/(NColors-1.0);
+ return sequence(new pen(int i) {return gray(1-17*i*ninv);},NColors);
+}
+
+// Draw the histogram, with axes
+bounds range=image(points,values,Range(0,40),InvGrayscale());
+draw(contour(points,values,new real[] {1,2,3,4,8,12,16,20,24,28,32,36,40},
+ operator--),blue);
+xaxis("$x$",BottomTop,LeftTicks,above=true);
+yaxis("$y$",LeftRight,RightTicks,above=true);
+