Indexing routines¶
See also
Generating index arrays¶
| c_ | Translates slice objects to concatenation along the second axis. |
| r_ | Translates slice objects to concatenation along the first axis. |
| s_ | A nicer way to build up index tuples for arrays. |
| nonzero (a) | Return the indices of the elements that are non-zero. |
| where (condition, [x, y]) | Return elements, either from x or y, depending on condition. |
| indices (dimensions[, dtype]) | Return an array representing the indices of a grid. |
| ix_ (*args) | Construct an open mesh from multiple sequences. |
| ogrid | Construct a multi-dimensional open “meshgrid”. |
| unravel_index (x, dims) | Convert a flat index into an index tuple for an array of given shape. |
Indexing-like operations¶
| take (a, indices[, axis, out, mode]) | Take elements from an array along an axis. |
| choose (a, choices[, out, mode]) | Use an index array to construct a new array from a set of choices. |
| compress (condition, a[, axis, out]) | Return selected slices of an array along given axis. |
| diag (v[, k]) | Extract a diagonal or construct a diagonal array. |
| diagonal (a[, offset, axis1, axis2]) | Return specified diagonals. |
| select (condlist, choicelist[, default]) | Return an array drawn from elements in choicelist, depending on conditions. |
Inserting data into arrays¶
| place (arr, mask, vals) | Changes elements of an array based on conditional and input values. |
| put (a, ind, v[, mode]) | Changes specific elements of one array by replacing from another array. |
| putmask (a, mask, values) | Changes elements of an array based on conditional and input values. |
Iterating over arrays¶
| ndenumerate | Multidimensional index iterator. |
| ndindex | Pass in a sequence of integers corresponding to the number of dimensions in the counter. This iterator will then return an N-dimensional counter. |
| flatiter |
