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Numerical integration: Difference between revisions
Updated both D entries
(Updated D versions) |
(Updated both D entries) |
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Line 893:
template integrate(alias method) {
double integrate(F, Float)(in F f, in Float a,
in Float b, in int steps) {
double s = 0.0;
immutable double h = (b - a) / steps;
foreach (i; 0 .. steps)
s += method(f, a + h * i, h);
return h * s;
}
Line 910:
double rectangularMiddle(F, Float)(in F f, in Float x, in Float h)
pure nothrow {
return f(x + h / 2);
}
Line 925:
double simpson(F, Float)(in F f, in Float x, in Float h)
pure nothrow {
return (f(x) + 4 * f(x + h / 2) + f(x + h)) / 6;
}
Line 988:
immutable Float h = (b - a) / steps;
foreach (i; 0 .. steps)
s += method!(f, Float)(a + h * i, h);
return h * s;
}
Line 1,001:
double rectangularMiddle(alias f, Float)(in Float x, in Float h)
pure nothrow {
return f(x + h / 2);
}
Line 1,016:
double simpson(alias f, Float)(in Float x, in Float h)
pure nothrow {
return (f(x) + 4 * f(x + h / 2) + f(x + h)) / 6;
}
double f1(in double x) pure nothrow { return x ^^ 3; }▼
double f2(in double x) pure nothrow{ return 1 / x; }▼
double f3(in double x) pure nothrow{ return x; }▼
alias TypeTuple!(f1, f2, f3, f3) funcs;▼
void main() {
▲ static double f1(in double x) pure nothrow { return x ^^ 3; }
▲ static double f2(in double x) pure nothrow { return 1 / x; }
▲ static double f3(in double x) pure nothrow { return x; }
▲ alias TypeTuple!(f1, f2, f3, f3) funcs;
alias TypeTuple!("rectangular left: ",
"rectangular middle: ",
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