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python Programming Glossary: np.emptyFitting a 3D array of data to a 1D function with numpy or scipy http://stackoverflow.com/questions/15094619/fitting-a-3d-array-of-data-to-a-1d-function-with-numpy-or-scipy y sz 100 # size z # creating the reference parameters tmp np.empty 4 sy sz tmp 0 1.2 0.8 np.random.random_sample sy sz 0.8 tmp.. tmp 2 np.ones sy sz tmp 3 np.ones sy sz np.pi 4 param_ref np.empty 4 sy sz sx # param_ref in this shape will allow an for i in..
numpy 3d to 2d transformation based on 2d mask array http://stackoverflow.com/questions/15469302/numpy-3d-to-2d-transformation-based-on-2d-mask-array as it import numpy as np def apply_mask field indices data np.empty indices.shape #It seems highly likely that there is a more numpy.. nicer import numpy as np def apply_mask field indices data np.empty indices.shape for idx_tup zidx in np.ndenumerate indices data..
ode integration in python versus mathematica results http://stackoverflow.com/questions/16222302/ode-integration-in-python-versus-mathematica-results .set_integrator 'dopri5' solver.set_initial_value u0 u np.empty len dt 6 u 0 u0 for ii in range 1 len dt u ii solver.integrate..
creating small arrays in cython takes a humongous amount of time http://stackoverflow.com/questions/18410342/creating-small-arrays-in-cython-takes-a-humongous-amount-of-time double ndim 1 u cdef np.ndarray np.int_t ndim 1 r np.empty u.shape 0 dtype int cdef int i j 0 for i in range u.shape 0.. 'test.UntypedWithLoop a u r ' sstr print time for just np.empty timeit.timeit 'numpy.empty 10 int ' sstr The binary search implementation.. inputs and doing N iterations 0.244267940521 time for just np.empty 1.0983929634 Why is the np.empty step taking so much time and..
http://stackoverflow.com/questions/3374878/with-the-python-imaging-library-pil-how-does-one-compose-an-image-with-an-alp a 9166671 190597 src np.asarray src dst np.asarray dst out np.empty src.shape dtype 'float' alpha np.index_exp 3 rgb np.index_exp..
Numpy grouping using itertools.groupby performance http://stackoverflow.com/questions/4651683/numpy-grouping-using-itertools-groupby-performance values idx np.concatenate np.where diff 0 len values index np.empty len idx 1 dtype 'u4 u2' index 'f0' values idx 1 index 'f1' np.diff..
Is it possible to specify your own distance function using Scikits.Learn K-Means Clustering? http://stackoverflow.com/questions/5529625/is-it-possible-to-specify-your-own-distance-function-using-scikits-learn-k-means 2 issparse X issparse Y if sxy 0 return cdist X Y kwargs d np.empty X.shape 0 Y.shape 0 np.float64 if sxy 2 for j x in enumerate..
Use binary COPY table FROM with psycopg2 http://stackoverflow.com/questions/8144002/use-binary-copy-table-from-with-psycopg2 'i4' 'ts' 'i2' 's' str x 'f4' for x in range shape 0 data np.empty shape 1 shape 2 dtype data 'id' np.arange shape 1 shape 2 1.. field '_length' ' i4' field dtype.replace ' ' ' ' pgcopy np.empty dat.shape pgcopy_dtype pgcopy 'num_fields' len dat.dtype for..
Convert RGBA PNG to RGB with PIL http://stackoverflow.com/questions/9166400/convert-rgba-png-to-rgb-with-pil object front np.asarray front back np.asarray back result np.empty front.shape dtype 'float' alpha np.index_exp 3 rgb np.index_exp..
Performance comparison of OpenCV-Python interfaces, cv and cv2 http://stackoverflow.com/questions/9357696/performance-comparison-of-opencv-python-interfaces-cv-and-cv2 'sir.jpg' 0 width gray.shape 0 height gray.shape 1 h np.empty width height 3 t time.time for i in xrange width for j in xrange.. cv2.imread 'lena_full.jpg' 0 height width gray.shape h np.empty height width 3 np.uint8 t time.time for i in xrange height for..
Simple Digit Recognition OCR in OpenCV-Python http://stackoverflow.com/questions/9413216/simple-digit-recognition-ocr-in-opencv-python thresh cv2.RETR_LIST cv2.CHAIN_APPROX_SIMPLE samples np.empty 0 100 responses keys i for i in range 48 58 for cnt in contours..
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