vectorization

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Efficient evaluation of a function at every cell of a NumPy array

Given a NumPy array A, what is the fastest/most effic开发者_运维知识库ient way to apply the same function, f, to every cell?[详细]

2023-04-11 13:12 分类：问答
pdist2 equivalent in MATLAB version 7

I need to calculate the euclidean distance between 2 matrices in matlab. Currently I am using bsxfun and calculating the distance as below( i am attaching a snippet of the code ):[详细]

2023-04-11 09:59 分类：问答
Matlab: Optimize this (pt 2)

Here\'s another one: ValidFirings = ((DwellTimes > 30/(24*60*60)) | (GroupCount > 1)); for i = length(ValidFirings):-1:2[详细]

2023-04-10 08:03 分类：问答
vectorization vs. parallelization in R

As a toy example, suppose that we have a function called \'my_func\' (the code is below) that takes two parameters \'n\' and \'p\'. Our function, \'my_func\', will generate a random matrix \'x\' with[详细]

2023-04-09 05:10 分类：问答
'for' loop vs vectorization in MATLAB

I was programming something in MATLAB and, as recommended, I am always trying to use vectorization. But in the end the program was quite slow. So I found out that in one place the code is significantl[详细]

2023-04-08 05:44 分类：问答
Why isn't this loop vectorized?

One particular hot spot when I profile a code I am working on, is the following loop: for(int loc = start; loc<end; ++loc)[详细]

2023-04-06 19:06 分类：问答
Is there any OSS library or paper that does Vector path tracing of mono bitmaps?

i am just interested in how these things work and am after a library or paper that describes the approach that most of these take. At a guess they pro开发者_开发百科bably support a few basic construct[详细]

2023-04-05 20:37 分类：问答
Loop optimization by the IBM xlC compiler with Altivec

I was just playing around with the Altivec extension on a power6 cluster we have.I noticed that when I compiled the code below without any optimizations, my speedup was 4 as I was expecting.However, w[详细]

2023-04-05 19:07 分类：问答
how to use numpy.vectorize or numpy.frompyfunc

[EDIT:I sort of brush this example up so I didn\'t clean up my code very well. My question is more on, how do I pass a subarray into a numpy.vectorize-d function, not specifically about this example.][详细]

2023-04-05 03:53 分类：问答
Apply lm to subset of data frame defined by a third column of the frame

I\'ve got a data frame containing a vector of x values, a vector of y values, and a vector of IDs: x <- rep(0:3, 3)[详细]

2023-04-04 14:41 分类：问答