Tagged Questions
1
vote
4answers
2k views
Python/NumPy first occurrence of subarray
In Python or NumPy, what is the best way to find out the first occurrence of a subarray?
For example, I have
a = [1, 2, 3, 4, 5, 6]
b = [2, 3, 4]
What is the fastest way (run-time-wise) to find ...
1
vote
1answer
2k views
Python/Numpy - Extract a 2-d Sub-array from a 2-d array using variables
Ok, So I have a 2-d array of data which has the shape(23025, 1000), it's called 'allfiles'.
I need to go through the array 50 columns at a time and extract them to a sub-array for manipulation. The ...
0
votes
2answers
228 views
“Splitting” the output of a RLE (groupby) depending on a defined value ( the “character” to split the RLE on )
Consider the "string" ( treat it as an array of digits )
0 0 1 8 8 8 1 0
The RLE ( "groupby" ) is:
[(0,2), (1, 1), (8,3), (1, 1), (0, 1)]
We then enrich the above RLE with the sum of the run ...
0
votes
2answers
564 views
Calculating conditional probabilities from joint pmfs in numpy, too slow. Ideas? (python-numpy)
I have a conjunctive probability mass function array, with shape, for example (1,2,3,4,5,6) and I want to calculate the probability table, conditional to a value for some of the dimensions (export the ...
