Axis specification - OADL array axis numbering
arr.meth(... AXIS)
All array methods which can take an axis specifier
Several array methods take an axis specifier, such as .reduce() and .accum(). OADL axes are
numbered from 0, and correspond to the axis'th entry of the
array shape. If the axis specifier is
omittited, typically the last axis of the array is used. If the
axis specifier is negative, then it indicates that the actual
axis to be used is the array rank plus the
given axis. Therefore, an axis of -1 typically
corresponds to the default (omitted) axis specification.
a = [2,3,4].iterate()
a
0 1 2 3
4 5 6 7
8 9 10 11
12 13 14 15
16 17 18 19
20 21 22 23
// Default is across the last axis - the columns
a.accum(`+)
0 1 3 6
4 9 15 22
8 17 27 38
12 25 39 54
16 33 51 70
20 41 63 86
// Accumulate across axis 0 - the slices
a.accum(`+,0)
0 1 2 3
4 5 6 7
8 9 10 11
12 14 16 18
20 22 24 26
28 30 32 34
// Accumulate across axis 1 - the rows
a.accum(`+,1)
0 1 2 3
4 6 8 10
12 15 18 21
12 13 14 15
28 30 32 34
48 51 54 57
a.accum(`+) == a.accum(`+,2)
true
a.accum(`+)== a.accum(`+,-1)
true
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rank
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