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authorKarl Berry <karl@freefriends.org>2013-04-07 18:26:53 +0000
committerKarl Berry <karl@freefriends.org>2013-04-07 18:26:53 +0000
commitb04c2e1a42573e9735547702356c7b9a769a6855 (patch)
treec0753443f39500a062d7698fe6b94359c813f871 /Master/texmf-dist/doc/asymptote/examples/imagehistogram.asy
parentfb0bf13304a356f197bfc1add17f98c07e96f17b (diff)
texmf -> texmf-dist: doc
git-svn-id: svn://tug.org/texlive/trunk@29714 c570f23f-e606-0410-a88d-b1316a301751
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+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);
+