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Results tagged with matrix
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user 34755
Questions on the manipulation of matrices in Mathematica.
2
votes
How to convert a matrix into a sparse matrix
According to the link (How to | Work with Sparse Matrices) : "https://reference.wolfram.com/language/howto/WorkWithSparseMatrices.html". Hope this help.
mat = SparseArray[{{1, 0, 0, 4}, {0, 0, 0, 0}, …
- 479
13
votes
1
answer
4k
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. find … The projection Matrix "w" as the following
w = dataCorrEigenvectors[[All, 1 ;; 4]];
I try to calculate the dot product of W against data, however, it seems the result is not same as expectation. …
- 479