[Numpy-discussion] Scalar array - a trap for the unwary
Colin J. Williams
cjw at sympatico.ca
Sat Jan 21 16:12:02 EST 2006
In the script below, b is presented as an integer, either with str or
repr, but it is an array and needs further processing to treat it as in
integer.
I much prefer the numarray treatment, particularly in a matrix context.
I suggest that, if it looks like an integer, b[1] should return a Python
scalar.
Script:
# tScalar.py Scalar vs rank 0
import numpy.core.multiarray as _mu
a= _mu.array([1, 2, 4])
print 'a:', a, 'repr(a):', repr(a), 'shape:', a.shape, 'dtype:', a.dtype
b= a[1]
print 'b:', b, 'repr(b):', repr(b), 'shape:', b.shape, 'dtype:', b.dtype
Result:
a: array([1, 2, 4], 'l') repr(a): array([1, 2, 4], 'l') shape: (3,)
dtype: <type 'int32_arrtype'>
b: 2 repr(b): 2 shape: () dtype: <type 'int32_arrtype'>
Colin W.
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