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python Programming Glossary: np.fromitermajor memory problems reading in a csv file using numpy http://stackoverflow.com/questions/10264739/major-memory-problems-reading-in-a-csv-file-using-numpy line yield item with open filename 'r' as infile data np.fromiter items infile float64 1 data data.reshape 1 num_cols np.save..
Flatten a nested list of variable sized sublists into a SciPy array http://stackoverflow.com/questions/15366053/flatten-a-nested-list-of-variable-sized-sublists-into-a-scipy-array numpy scipy share improve this question How about np.fromiter In 49 timeit np.hstack lst 1000 10 loops best of 3 25.2 ms per.. 1000 1000 loops best of 3 1.81 ms per loop In 52 timeit np.fromiter chain.from_iterable lst 1000 dtype 'int' 1000 loops best of..
Numpy grouping using itertools.groupby performance http://stackoverflow.com/questions/4651683/numpy-grouping-using-itertools-groupby-performance groups k len list g for k g in groupby values index np.fromiter groups dtype 'u4 u2' if __name__ '__main__' from timeit import.. groups k len list g for k g in groupby values index np.fromiter groups dtype 'u4 u2' def group_gnibbler import numpy as np from.. groups k sum 1 for i in g for k g in groupby values index np.fromiter groups dtype 'u4 u2' def group_christophe import numpy as np..
http://stackoverflow.com/questions/6367589/saving-numpy-array-in-mongodb x record 'feature1' x.tolist # deserialize 1D array x x np.fromiter record 'feature1' For multidimensional data I believe you'll..
How to convert pointer to c array to python array http://stackoverflow.com/questions/7543675/how-to-convert-pointer-to-c-array-to-python-array . It is the same loop as in your question but faster a np.fromiter Data dtype np.float count DataLength.value # copy To create..
Python out of memory on large CSV file (numpy) http://stackoverflow.com/questions/8956832/python-out-of-memory-on-large-csv-file-numpy yield dtype item iter_loadtxt.rowlength len line data np.fromiter iter_func dtype dtype data data.reshape 1 iter_loadtxt.rowlength..
NumPy vs. multiprocessing and mmap http://stackoverflow.com/questions/9964809/numpy-vs-multiprocessing-and-mmap results pool.imap calculation chunks data results np.fromiter results dtype np.float def chunks data chunksize 100 Overly.. results pool.imap calculation chunks data results np.fromiter results dtype np.float def chunks data chunksize 100 Overly..
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