numarray Manual

15.2 Global constants

These constants specify what part of the result the convolve and correlate functions of this module return. Each of the following examples assumes that the following code has been executed:

arr = numarray.arange(8)

FULL

Return the full convolution or correlation of two arrays.

>>> conv.correlate(arr, [1, 2, 3], mode=conv.FULL)
array([ 0,  3,  8, 14, 20, 26, 32, 38, 20,  7])

PASS

Correlate the arrays without padding the data.

>>> conv.correlate(arr, [1, 2, 3], mode=conv.PASS)
array([ 0,  8, 14, 20, 26, 32, 38,  7])

SAME

Return the part of the convolution or correlation of two arrays that corresponds to an array of the same shape as the input data.

>>> conv.correlate(arr, [1, 2, 3], mode=conv.SAME)
array([ 3,  8, 14, 20, 26, 32, 38, 20])

VALID

Return the valid part of the convolution or correlation of two arrays.

>>> conv.correlate(arr, [1, 2, 3], mode=conv.VALID)
array([ 8, 14, 20, 26, 32, 38])

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