rowdoMatVec_Bygroup: the driver of grouped version calculations, enpowering...
In nickytong/GenAnalysis: Genomic Analysis

This calculated result between rows of mat and vec but at each group at a time as specified by the group vector It should be more flexible than rowcorMatMat which requires the same genomic mat; instead, here different group of analysis can have different sample size in genomics

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rowdoMatVec_Bygroup(mat, vec, group, fn, addAll = FALSE, addAllName = "all",
  parallel = FALSE, core = 1, returnArray = TRUE, returnEarly = FALSE,
  ...)

`mat`	a matrix, i.e. gene expression
`vec`	a vector of phenotype, continuous variable
`group`	a vector, categorical variable
`fn`	function to apply, e.g. rowttestMatVec, rowcorMatVec
`addAll`	whether to calculate correlation by using all data ignoring group; this is the overall correlation
`parallel`	deprecated; parallel is automatically enabled when core>1
`core`	number of cores to use; when core>1, parallel execution is enabled
`returnEarly`	return early for the fitted list; useful for rowanovamatVec since array is not feasible due to different dimensions of fits
`...`	additional parameters to fn