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When you index a multi-dimensional array, very often you want to let one or more dimensions be “spectators”. In Yorick, you accomplish this by leaving the corresponding index blank:
x(3,) x(,5:7) y(,::-1,) x(,) |
In these examples, x is a 2-D array, and y is a 3-D array. The first example, x(3,), represents the 1-D array of all the elements of x with first index 3. The second represents a 2-D array of all of the elements of x whose second indices are 5, 6, or 7. In the third example, y(,::-1,) is the y array with the elements in reverse order along its middle index. The fourth expression, x(,), means the entire 2-D array x, unchanged.
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