mir.interpolate.constant

import mir.ndslice;
import mir.math.common: approxEqual;

static immutable x = [0, 1, 2, 3];
static immutable y = [10, 20, 30, 40];

auto interpolant = constant!int(x.rcslice, y.rcslice!(const int));

assert(interpolant(-1) == 10);
assert(interpolant(0) == 10);
assert(interpolant(0.5) == 10);

assert(interpolant(1) == 20);

assert(interpolant(3) == 40);
assert(interpolant(4) == 40);

Constant!(F, N, X) constant(F, size_t N = 1, X = F)(Repeat!(N, Slice!(RCI!(immutable(X)))) grid, Slice!(RCI!(const(F)), N) values);

Constructs multivariate constant interpolant with nodes on rectilinear grid.

Parameters:

Repeat!(N, Slice!(RCI!(immutable(X)))) grid	x values for interpolant
Slice!(RCI!(const(F)), N) values	f(x) values for interpolant

Constraints grid, values must have the same length >= 1

Returns:

Constant

struct Constant(F, size_t N = 1, X = F) if (N && (N <= 6));

Multivariate constant interpolant with nodes on rectilinear grid.

Slice!(RCI!(const(F)), N) _data;

Aligned buffer allocated with mir.internal.memory. For internal use.

Repeat!(N, RCI!(immutable(X))) _grid;

Grid iterators. For internal use.

@nogc @safe this(Repeat!(N, Slice!(RCI!(immutable(X)))) grid, Slice!(RCI!(const(F)), N) data);

const @property Constant lightConst()();

const @property scope Slice!(RCI!(immutable(X))) grid(size_t dimension = 0)() return
if (dimension < N);

const @property scope @trusted immutable(X)[] gridScopeView(size_t dimension = 0)() return
if (dimension < N);

const @property scope size_t intervalCount(size_t dimension = 0)();

Returns:

intervals count.

const @property scope size_t[N] gridShape()();

enum uint derivativeOrder;

template opCall(uint derivative = 0) if (derivative <= derivativeOrder)

const scope @trusted auto opCall(X...)(in X xs)
if (X.length == N);

(x) operator.

Complexity O(log(grid.length))