vectorization

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Best way to vectorize C code by hand

I want to vectorize by hand some C code, in order to it speedup. For that purpose (SPE on the Cell processor or CBE) I want to use SIMD math. The code originally uses some physical vector calculations[详细]

2023-01-13 20:11 分类：问答
inconsistent results using isreal

Take this simple example: a = [1 2i]; x = zeros(1,length(a)); for n=1:length(a) x(n) = isreal(a(n)); end In an attempt to vectorize the code, I tried:[详细]

2023-01-13 13:34 分类：问答
Grouping functions (tapply, by, aggregate) and the *apply family

Whenever I want to do something \"map\"py in R, I usually try to use a function in the apply family.[详细]

2023-01-12 12:28 分类：问答
Using Numpy Vectorize on Functions that Return Vectors

numpy.vectorize takes a function f:a->b and turns it into g:a[]->b[]. This works fine when a and b are scalars, but I can\'t think of a reason why it wouldn\'t work with b as an ndarray or list,[详细]

2023-01-09 12:46 分类：问答
Finding islands of zeros in a sequence

Imagine you have a very long sequence. What is the most efficient way of finding the intervals where the sequence is all zeros (or more precisely the sequence drops to near-zero values abs(X)<eps):[详细]

2023-01-07 23:39 分类：问答
Compiler errors while building a project which uses Eigen, the C++ template library for linear algebra

in my project I\'m making use of Eigen C++ library for linear algebra and ONLY when I turn on the vectorization flags (mfpu=neon -mfloat-abi=softfp) for ARM NEON, I get compiler errors. I\'m not able[详细]

2023-01-07 20:23 分类：问答
Can this piece of matlab script be vectorized further?

So what I am trying to do with this code is find all pixels on a line of an image that are below a certain threshold. The problem, however, is that this code is executed in a double for loop (yeah I k[详细]

2023-01-07 10:51 分类：问答
Server-side conversion of raster images to vector images

I would like to convert images that have been uploaded by the user (in various formats and conditions) to a vector image format such as .eps. I\'m primarily开发者_运维知识库 working in PHP.[详细]

2023-01-06 17:48 分类：问答
MATLAB: comparison of cell arrays of string

I have two cell arrays of strings, and I want to check if they contain the same strings (they do not have to be in the same order, nor do we know if they are of the same lengths).[详细]

2023-01-06 17:34 分类：问答
how to avoid loops

HI All, I\'m new to R. I have two panel data files, with columns \"id\", \"date\" and \"ret\" file A has a lot more data than file B,[详细]

2023-01-06 15:16 分类：问答