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# Samuel L. Polk

##### Last seen: 15 days ago
11 total contributions since 2018

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Question

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 ...

1 month ago | 1 answer | 0

### 1

Question

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...

1 month ago | 1 answer | 0

### 1

Question

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...

2 months ago | 1 answer | 0

### 1

Question

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...

2 months ago | 1 answer | 0

### 1

Question

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...

2 months ago | 2 answers | 0

### 2

Question

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...

2 months ago | 1 answer | 0

### 1

Question

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...

3 months ago | 1 answer | 0

### 1

Question

.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...

5 months ago | 1 answer | 0

### 1

Question

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...

6 months ago | 1 answer | 0

### 1

Question

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...

2 years ago | 0 answers | 0