triangularPdf function
Triangular probability density function
with non-zero support over the interval (xMin, xMax)
.
The maximum occurs at (xMax - xMin) / 2
.
Throws an error of type ErrorOfType<InvalidFunctionParameter>
if xMin >= xMax
.
Implementation
double triangularPdf(num x, num xMin, num xMax) {
if (xMin >= xMax) {
throw ErrorOfType<InvalidFunctionParameter>(
message: 'Error in triangularPdf($x, $xMin, $xMax)',
invalidState: 'min: $xMin >= max: $xMax',
expectedState: 'min < max',
);
}
if (x <= xMin) return 0.0;
if (x >= xMax) return 0.0;
final h = (xMax - xMin) / 2;
if (x > xMin && x < xMin + h) {
return (x - xMin) / (h * h);
} else {
return (xMax - x) / (h * h);
}
}