Independently shuffles the column elements within each row of an array.
COLRANDOMIZE(s, idx)
(r, k) = COLRANDOMIZE(s, idx)
s |
- |
A series or array, the input to randomize. |
idx |
- |
An optional series, the indices of a previous randomize used to unscramble the input. |
A series or array, the randomly column reordered array.
(r, k) = COLRANDOMIZE(s) returns the randomly column reordered array and the indices used to perform the reordering. The returned indices can be used to restore the result to the original order.
W1: 1..5
W2: colrandomize(w1)
W1 contains the series {1, 2, 3, 4, 5}.
W2 contains the series {1, 2, 3, 4, 5}. For a single column, COLRANDOMIZE does not alter the input.
W1: ravel(1..12, 4);table
W2: (r, k) = colrandomize(w1);r
W3: colrandomize(w2, k)
W1 == {{1, 5, 9},
{2, 6, 10},
{3, 7, 11},
{4, 8, 12}}
W2 == {{5, 1, 9},
{6, 2, 10},
{7, 3, 11},
{8, 4, 12}}
The actual result in W2 may differ.
W3 == {{1, 5, 9},
{2, 6, 10},
{3, 7, 11},
{4, 8, 12}}
The columns of W1 are randomly reordered in W2 and restored in W3.
COLRANDOMIZE independently shuffles the column elements within each row of an array.
For a single column input, the original series is returned.
See COLPERM to randomly permute the columns of an array.
See ROWRANDOMIZE to independently shuffle the row elements within each column of an array.
See RANDOMIZE to arbitrarily reorder an array.
See RANDSAMPLE to return K random samples from a population.