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Results tagged with performance
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user 76626
Performance is a subset of Optimization: performance is the goal when you want the execution time of your program or routine to be optimal.
2
votes
2
answers
56
views
Get list of indices from searching for values in list of lists
Performance is an issue
def get_indices(list_of_lists):
indices = [0]*len([n for l in list_of_lists for n in l])
for i in range(len(indices)):
indices[i] = [ k for k,n in enumerate(list_of_lists …
- 521
4
votes
1
answer
819
views
Randomly split a vector into N bins of random lengths
Performance does matter, so I'm wondering if I should initialize the empty bins outside of the function. …
- 521
3
votes
2
answers
23k
views
Efficiently index rows of numpy array by exclusion
I need a function that takes a numpy array and a row number as inputs and returns the array (or copy of the array) excluding the given row. I want to do this as efficiently as possible.
# Test array
…
- 521
2
votes
Efficiently index rows of numpy array by exclusion
I was able to come up with a function that uses np.take that runs faster than the list method.
def index_rows_by_exclusion_nptake(arr, i):
"""
Return copy of arr excluding single row of posit …
- 521
5
votes
5
answers
356
views
Create matrices of a certain format
I need to create matrices that follow a specific format: the matrix is a square NxN matrix and the off-diagonals all have the same value (param) and the diagonals have values such that the rows sum to …
- 521
6
votes
1
answer
13k
views
Create symmetrical matrix from list of values
I need to make a matrix (in the form of a numpy array) by taking a list of
parameters of length N and returning an array of dimensions N+1 x N+1 where the off-diagonals are symmetric and each triangle …
- 521