if (Logical1){command1;command2;...} elseif (Logical2){...}[else{...}]
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Usage
'elseif' is a syntax element used in conjuction with 'if' and optionally
with 'else'.
A typical usage would be
Cmd> if(x > 1){y <- 1}elseif(x < 0){y <- -1}else{y <- 0}
The condition tested (x < 0 in the example) must be a scalar LOGICAL
variable or expression. The immediately following '{' must be on the
same line as elseif.
Type help("if") for complete information.