Created
August 8, 2020 01:01
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How to assign from a function which returns more than one value?
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# (https://stackoverflow.com/questions/1826519/how-to-assign-from-a-function-which-returns-more-than-one-value) | |
':=' <- function(lhs, rhs) { | |
frame <- parent.frame() | |
lhs <- as.list(substitute(lhs)) | |
if (length(lhs) > 1) | |
lhs <- lhs[-1] | |
if (length(lhs) == 1) { | |
do.call(`=`, list(lhs[[1]], rhs), envir=frame) | |
return(invisible(NULL)) | |
} | |
if (is.function(rhs) || is(rhs, 'formula')) | |
rhs <- list(rhs) | |
if (length(lhs) > length(rhs)) | |
rhs <- c(rhs, rep(list(NULL), length(lhs) - length(rhs))) | |
for (i in 1:length(lhs)) | |
do.call(`=`, list(lhs[[i]], rhs[[i]]), envir=frame) | |
return(invisible(NULL)) | |
} | |
functionReturningTwoValues <- function() { | |
return(list(1, matrix(0, 2, 2))) | |
} | |
c(a, b) := functionReturningTwoValues() |
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