IDX

Purpose:

Returns the indices of a series or array.

IDX(series, unravel)

series

An input series

unravel

Optional. An integer indicating if "unraveled" (i.e. sequential) indices should be returned.

0:	Normal indices
1:	Unraveled indices (default)

An array or series.

W1: gnorm(5, 1)

W2: idx(W1)

W2 == {1, 2, 3, 4, 5}

W1: {{1, 2, 3},

{2, 1, 3},

{3, 2, 1}}

W2: idx(w1)

W2 == {{1, 4, 7},

{2, 5, 8},

{3, 6, 9}}

a = idx(W1, 0)

a == {{1, 1, 1},

{2, 2, 2},

{3, 3, 3}}

By default, IDX(a) returns the indices in sequential, unraveled order. This form is useful in array reference expressions.

idx(a, 0) == colidx(a)

Use XVALS to return the X axis values.

See IDXTOX to convert indices to X values.