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Questions tagged [data-science]

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3
votes
0answers
73 views

Approximate Nearest Neighbors in Mathematica?

Is there any support for Approximate Nearest Neighbors (ANN) in Mathematica or third-party packages? I'm looking for a good implementation of locality sensitive hashing for applications where ...
1
vote
1answer
45 views

Rule based list manipulation

I'm trying to restructure the following expression: start = Table[{1, 2, 3, 4}, 5]; Join[{ToString /@ {first, second, third, fourth}},start] Into this: ...
11
votes
3answers
1k views

Noise filtering in images with PCA

I have a stack of images (usually ca 100) of the same sample. The images have intrinsic variation of the sample, which is my signal, and a lot of statistical noise. I did a principal components ...
11
votes
1answer
2k views

How to interpret the results of PCA

There is a larger matrix (1500 rows x 40 columns), 1500 observations x 40 variables. then I follow the procedures of PCA(Principal components analysis), 1. find correlation 2. find eigenvalues 3. ...
30
votes
1answer
1k views

How does Dataset compare to DataFrame in pandas?

Pandas is a Python package providing fast, flexible, and expressive data structures designed to make working with “relational” or “labeled” data. Just like ...