File:Hermigaplot.jpg

#include<math.h>
#include<stdio.h>
#include<stdlib.h>
#define DB double
#define DO(x,y) for(x=0;x<y;x++)

DB HermiteNo[14]={1, 2, 8, 48, 384, 3840, 46080, 645120, 10321920, 185794560,
3715891200, 81749606400, 1961990553600, 51011754393600};

DB HermitH0[7][7]= // COEFFICIENTS OF EVEN HERMITEH
{{1, 0, 0, 0, 0, 0, 0}, {-2, 4, 0, 0, 0, 0, 0},
{12, -48, 16, 0, 0, 0, 0}, {-120, 720, -480, 64, 0, 0, 0},
{1680, -13440, 13440, -3584, 256, 0, 0},
{-30240, 302400, -403200, 161280, -23040, 1024, 0},
{665280, -7983360, 13305600, -7096320, 1520640, -135168, 4096}};

DB HermitH1[7][7]= // COEFFICIENTS OF ODD HERMITЕH
{{2, 0, 0, 0, 0, 0, 0}, {-12, 8, 0, 0, 0, 0, 0},
{120, -160, 32, 0, 0, 0, 0}, {-1680, 3360, -1344, 128, 0, 0, 0},
{30240, -80640, 48384, -9216, 512, 0, 0},
{-665280, 2217600, -1774080, 506880, -56320, 2048, 0},
{17297280, -69189120, 69189120, -26357760,4392960, -319488, 8192}};

DB HermitH(int n,DB x){ int m,M; DB s, xx;
if(n==0) return 1.;
if(n==1) return x+x;
if(n>13) {printf("hermite number %2d is not yet implemented (max. is 13)\n consider to stop..",n); getchar(); return 0;}
xx=x*x; //printf("Hernith called with n=%3d x=%8.2lf\n",n,x);
if(n/2*2==n){M=n/2; s=0.;for(m=M;m>0;m--) {s+=HermitH0[M][m]; s*=xx;}
                                       return (HermitH0[M][0]+s);}
  else{ M=(n-1)/2; s=0.; for(m=M;m>0;m--) {s+=HermitH1[M][m]; s*=xx;}
                                      return (HermitH1[M][0]+s)*x; }
}

DB hermiten(int n,DB x){ if(n>13) {printf("hermite number %2d is not yet implemented (max. is 13)\n consider to stop..",n); getchar(); return 0;}
return HermitH(n,x)/sqrt(sqrt(M_PI)*HermiteNo[n]);
}

#include"ado.cin"

int main(){ // printf("%16d %16d\n",INT_MIN,INT_MAX);
int M,m,n; DB x,xx,y,z,s;
FILE *o; o=fopen("hermigaplo.eps", "w");
ado(o,804,204);
fprintf(o,"402 102 translate 100 100 scale 2 setlinecap 1 setlinejoin\n");
#define M(x,y) fprintf(o,"%6.4lf %6.4lf M\n",x+0., y+0.);
#define L(x,y) fprintf(o,"%6.4lf %6.4lf L\n",x+0., y+0.);
for(m=-4; m<5; m++) {M(m,-1)L(m,1)}
for(n=-1; n<2; n++) {M(-4,n)L(4,n)}
fprintf(o,".01 W 0 0 0 RGB S\n");
DO(n,201){x=.05*(n-100); y= hermiten(0,x)*exp(-x*x/2.); if(n==0)M(x,y) else L(x,y) } fprintf(o,"0 0 0 RGB .016 W S\n ");
DO(n,201){x=.05*(n-100); y= hermiten(1,x)*exp(-x*x/2.); if(n==0)M(x,y) else L(x,y) } fprintf(o,"0 0 0 RGB .016 W S\n ");
DO(n,201){x=.05*(n-100); y= hermiten(2,x)*exp(-x*x/2.); if(n==0)M(x,y) else L(x,y) } fprintf(o,"0 0 0 RGB .016 W S\n ");
DO(n,201){x=.05*(n-100); y= hermiten(3,x)*exp(-x*x/2.); if(n==0)M(x,y) else L(x,y) } fprintf(o,"1 0 0 RGB .016 W S\n ");
DO(n,201){x=.05*(n-100); y= hermiten(4,x)*exp(-x*x/2.); if(n==0)M(x,y) else L(x,y) } fprintf(o,"0 .7 0 RGB .016 W S\n ");
DO(n,201){x=.05*(n-100); y= hermiten(5,x)*exp(-x*x/2.); if(n==0)M(x,y) else L(x,y) } fprintf(o,"0 0 1 RGB .016 W S\n ");
DO(n,201){x=.05*(n-100); y= hermiten(6,x)*exp(-x*x/2.); if(n==0)M(x,y) else L(x,y) } fprintf(o,".8 0 .9 RGB .016 W S\n ");
fprintf(o,"showpage\n%c%cTrailer\n",'%','%'); fclose(o);
system("epstopdf hermigaplo.eps");
system("open hermigaplo.pdf");
}

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