Created
March 29, 2016 17:50
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cor from matrix data.frame
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| library(data.table) | |
| DT <- as.data.table(ChickWeight)[ , lapply(.SD, as.numeric)] | |
| DF <- as.data.frame(cor(DT)) | |
| #^ here's what you have from Stata^ | |
| #convert to matrix | |
| M <- as.matrix(DF) | |
| #axe the lower triangle | |
| M[lower.tri(M, diag = TRUE)] <- NA | |
| #now to data.table w/ melt: | |
| DT <- as.data.table(M, keep.rownames = TRUE) | |
| melt(DT, id.vars="rn")[!is.na(value)] |
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