[Solved] Calling variable in matrix with another variable, R

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It looks like you’re talking about a data frame, not a matrix. You can use names(Fires) to get a vector of column names, and use that to go from your variables to a column reference:

X <- 1
Y <- 1
column.name <- paste0( X, Y )
Fires[ , column.name ]

EDIT: in fact, you can even skip the match step.

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solved Calling variable in matrix with another variable, R