index

The operator can be placed on the canvas in two ways:

• From the Tensor Operations (``tensor'') toolbar ; or
• By typing the letters ``index'' on the canvas and then pressing the Enter key.

Returns the index within the hypecube where the input is true (ie ). For example, where

$$\begin{eqnarray*} \iota(3,3) & = & \left(\begin{array}{ccc} 0 & 3 & 6\\ 1 & 4 &... ...& 3 & nan\\ 1 & 4 & nan\\ 2 & nan & nan \end{array}\right),\\ \end{eqnarray*}% WIDTH=610 HEIGHT=253$$

Note that the output array has the same shape as the input, with unused values padded with NANs (missing value).

Dimension and argument parameters are unused.