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NRPAS13
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POLIN2.DEM
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1991-04-29
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45 lines
PROGRAM d3r9 (input,output);
(* driver for routine POLIN2 *)
CONST
n=5;
pi=3.1415926;
TYPE
glmarray = ARRAY [1..n] OF real;
glnarray = glmarray;
glmbyn = ARRAY [1..n,1..n] OF real;
VAR
i,j : integer;
dy,f,x1,x2,y : real;
x1a,x2a : glmarray;
ya : glmbyn;
(*$I MODFILE.PAS *)
(*$I POLINT.PAS *)
(*$I POLIN2.PAS *)
BEGIN
FOR i := 1 to n DO BEGIN
x1a[i] := i*pi/n;
FOR j := 1 to n DO BEGIN
x2a[j] := 1.0*j/n;
ya[i,j] := sin(x1a[i])*exp(x2a[j])
END
END;
(* test 2-dimensional interpolation *)
writeln;
writeln ('Two dimensional interpolation of sin(x1)exp(x2)');
writeln;
writeln ('x1':9,'x2':12,'f(x)':13,'interpolated':16,'error':11);
FOR i := 1 to 4 DO BEGIN
x1 := (-0.1+i/5.0)*pi;
FOR j := 1 to 4 DO BEGIN
x2 := -0.1+j/5.0;
f := sin(x1)*exp(x2);
polin2(x1a,x2a,ya,n,n,x1,x2,y,dy);
writeln (x1:12:6,x2:12:6,f:12:6,y:12:6,dy:15:6)
END;
writeln ('***********************************');
END
END.