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Samuel L. Polk


Last seen: 1 year ago |  Active since 2018

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Matching the labels of a clustering with ground truth labels for performance analysis
I'm working on clustering a dataset I have ground truth labels. I want to evaluate the confusion matrix between the predicted ...

3 years ago | 1 answer | 0

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Question


Implement Single Linkage Clustering with Specified Initialization
Suppose I have an dataset that I would like to implement single-linkage clustering (SLC) on. In addition to the dataset, I am ...

3 years ago | 0 answers | 0

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answers

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 ...

3 years ago | 1 answer | 0

1

answer

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...

3 years ago | 1 answer | 0

1

answer

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...

3 years ago | 1 answer | 0

1

answer

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...

3 years ago | 1 answer | 0

1

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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...

3 years ago | 2 answers | 0

2

answers

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...

4 years ago | 1 answer | 0

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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...

4 years ago | 1 answer | 0

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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...

4 years ago | 1 answer | 0

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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...

4 years ago | 1 answer | 0

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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...

6 years ago | 0 answers | 0

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Question


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...

6 years ago | 1 answer | 0

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