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- PROGRAM d9r6(input,output);
- (* driver for routine RTSEC *)
- CONST
- n=100;
- nbmax=20;
- x1=1.0;
- x2=50.0;
- TYPE
- glnbmax = ARRAY [1..nbmax] OF real;
- VAR
- i,nb : integer;
- root,xacc : real;
- xb1,xb2 : glnbmax;
-
- (*$I MODFILE.PAS *)
- (*$I BESSJ0.PAS *)
-
- FUNCTION fx(x: real): real;
- BEGIN
- fx := bessj0(x)
- END;
-
- (*$I ZBRAK.PAS *)
-
- (*$I RTSEC.PAS *)
-
- BEGIN
- nb := nbmax;
- zbrak(x1,x2,n,xb1,xb2,nb);
- writeln;
- writeln('roots of bessj0:');
- writeln('x':20,'f(x)':15);
- FOR i := 1 to nb DO BEGIN
- xacc := (1.0e-6)*(xb1[i]+xb2[i])/2.0;
- root := rtsec(xb1[i],xb2[i],xacc);
- writeln(' root ',i:2,' ',root:12:6,fx(root):14:6)
- END
- END.
-