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# Samuel L. Polk

##### Last seen: 6일 전
11 2018 이후 총 참여 횟수

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Fast restricted nearest neighbor search using KD Tres.
I would like to implement a restricted nearest neighbor search for each point in a data matrix X. Specifically, I would like to ...

23일 전 | 답변 수: 1 | 0

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MATLAB is running the wrong version of Python
I am working on a project in MATLAB (on a fully-updated Mac) but need some functions from a C++ library with Python bindings (th...

26일 전 | 답변 수: 1 | 0

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Find distance between one point and a subset of other points.
I would like to find the distance between a point and all points in a matrix , where : a subset of . Mathematically, this woul...

약 1달 전 | 답변 수: 1 | 0

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Fast matrix multiplication with diagonal matrices
Let be a large, sparse matrix. Let and be diagonal matrices of the same size. I would like to calculate . However, these matri...

약 2달 전 | 답변 수: 1 | 0

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Preserving numerical symmetry in large nxn matrix
Let be a sparse, symmetric nxn matrix and a sparse, diagonal nxn matrix. These matrices are very large (n~250,000) so both mus...

약 2달 전 | 답변 수: 2 | 0

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Row-normalizing large sparse matrix
I have a large (n x n), sparse matrix with N entries per row, named W. I would like to normalize this matrix so that each row su...

약 2달 전 | 답변 수: 1 | 0

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Issue with path is breaking some built-ins
I recently reset my path to default. Ever since, when I try to use the isnan function, I get the following error message: Check...

2달 전 | 답변 수: 1 | 0

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.mexmaci64 mac
Hello, I am using someone else's toolbox in MATLAB, which contains .mexmaci64 files. I downloaded it from the internet on my co...

4달 전 | 답변 수: 1 | 0

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Inequality Indexing using Optimization Toolbox
I would like to optimize an objective function with a constraint that is based on logical indexing. However, it seems like I can...

6달 전 | 답변 수: 1 | 0

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How does the multiclass logistic regression's optimization work?
Hi all, I am working on a 3-class classification problem (call our classes 1, 2, and 3) with two different datasets (call them...

약 2년 전 | 답변 수: 0 | 0

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How does k-fold cross validation work in KNN?
My understanding is that KNN uses the classifications of the k data nearest to a query point in order to inform the classificati...

2년 이상 전 | 답변 수: 1 | 0

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