svdSafe: Safe SVD-like matrix decomposition
In RefFreeEWAS: EWAS using Reference-Free DNA Methylation Mixture Deconvolution

Description Usage Arguments Details Value Author(s) See Also

SVD that traps errors and switches to QR when necessary

1	svdSafe(X)

`X`	Matrix to decompose

This function traps errors in the svd function due to numerically zero singular values, and replaces the operation with a QR decomposition. Technically, the R component of the decomposition fails the orthogonality constraint required for the SVD decomposition, but this function exists to save bootstraps from rudely failing; since the critical component of the SVD (in this application) is the left orthogonal matrix, this is a reasonable approximation for bootstrap purposes. If there are too many svd failures (which will will be reported by the function) then it is worth looking into the design matrix.

A list as in what svd produces: U and V matrices as well as the d vector of singular values.

E. Andres Houseman

svd

RefFreeEWAS documentation built on May 2, 2019, 5:52 a.m.