# Questions tagged [vectorization]

Vectorization refers to a programming paradigm where functions operate on whole arrays in one go. Use this tag if your code contains vectorized operations

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### C# System.Numerics.Vector<T> Clamp

The software that I develop uses large floating-point arrays up to the maximum size that can be allocated in C#. I have a large number of algorithms such as convolutions and filters that get executed ...
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### Converting Array of Float32 (float) to Array of UINT8 (unsigned char) Using AVX2 [closed]

Given input array of Float32 (float) with numElements how could one efficiently convert it ...
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### Converting Array of UINT8 (unsigned char) to Array of Float32 (float) Using AVX2

Given input array of UINT8 (unsigned char) with numElements how could one efficiently ...
60 views

### Optimising multiplication of matrix rows with matrix slice/page

I've recently vectorized most of the code for an optimization problem but this one still eludes me. As the procedure and not the actual values are important here, I have replaced the original matrices ...
105 views

### Vectorized N-Dimensional Random Walk in Cartesian Coordinates

I have written a random-walk routine that I hope to build upon in the future. Before doing so, I was hoping to get some critique. I believe the implementation is correct. I noticed that many other ...
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### Vectorizing a polar coordinate conversion loop in a fingerprint-matching process

I am working on a fingerprint matching technique and it takes a lot of computation time to obtain the result. I am trying to implement the matching process given in A Minutia Matching Algorithm in ...
2k views

### Rolling regressions in R

I want to run rolling regressions over each group and store the coefficient. The following works, but it's slow, since I have too many series and I want to run too many regressions for each group. ...
411 views

### Jacobian product

Do you have in mind a way to compute the following sum $$R_{i,j,k} = \sum_{l=0}^{2} J_{i,j,l+3k} v_{i,j,l}$$ obviously in a vectorised fashion? This may sound like an equivalent of: ...
7k views

### Remove duplicates in list of lists where an item in each list is ignored when determining duplicity

I have lines_list_copy of the form: [['a1', 'b1', 'c1', 'd1', 'e1'], ['a2', 'b2', 'c2', 'd2', 'e2'], ... ] I needed to ...
145 views

### Matlab Computer Vision

The code below takes a video as input (a drop onto a fabric surface) and I want it to return the area of the drop. Currently the code works, but I'm no Matlab expert, and wrote it entirely through ...
424 views

### Weighted dice with n faces

Here you find some code that returns the value of a multivariate Bernoulli density function - for a dice with n faces, where each face has its weight (weight must be positive reals, not necessarily ...
615 views

### Operating multiple columns of one pandas DataFrame using data from another

I have a DataFrame of data from a survey that was repeated over several years, asking people about their income and how much money they had in savings. For simplicity, let's pretend it looks like this:...
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### Updating an inventory with R using apply functions

I have created an inventory that works via QR codes. Briefly: the QR code codes for an email with the book/student checking it out. The email is downloaded into R using the gmailR package (code not ...
148 views

### Vectorizing in Python [closed]

I have the following code: ...