Numpy Diff
Oct 18, 2015 numpy.diff ¶ numpy.diff(a, n=1, axis=1) source ¶ Calculate the nth order discrete difference along given axis. The first order difference is given by out n = a n+1  a n along the given axis, higher order differences are calculated by using diff recursively. The NumPy class is a highlevel abstraction of NDArray that allows NumSharp to be used in the same way as Python's NumPy, minimizing API differences caused by programming language features, allowing.NET developers to maximize Utilize a wide range of NumPy code resources to seamlessly translate python code into.NET code. Numpy.diff ¶ numpy.diff(a, n=1, axis=1, prepend=, append=) source ¶ Calculate the nth discrete difference along the given axis. The first difference is given by out i = a i+1  a i along the given axis, higher differences are calculated by using diff recursively. The Python numpy comparison operators and functions used to compare the array items and returns Boolean True or false. The Python Numpy comparison functions are greater, greaterequal, less, lessequal, equal, and notequal. The problem is that you have a structured array instead of a regular 2dimensional array, so numpy does not know how to subtract one tuple from another. Convert your structured array to a regular array (from this SO question): myarray = myarray.view(numpy.uint8).reshape((myarray.shape0, 1)) and then do numpy.diff(myarray, axis=0).
Calculate the nth discrete difference along given axis.
The first difference is given by out[n]=a[n+1]a[n]
alongthe given axis, higher differences are calculated by using diff
recursively.
Parameters:  a : array_like n : int, optional
axis : int, optional


Returns:  diff : ndarray

Notes
Numpy Diff
For boolean arrays, the preservation of type means that the resultwill contain False when consecutive elements are the same andTrue when they differ.
Numpy Differential
For unsigned integer arrays, the results will also be unsigned. This shouldnot be surprising, as the result is consistent with calculating thedifference directly:
Diff Function In Python
If this is not desirable, then the array should be cast to a larger integertype first:
Examples