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2007 Jan 30
4
Speed of for loops
Hi Everyone,
I have a question about for loops. If you have something like:
f <- function(x) {
y <- rep(NA,10);
for( i in 1:10 ) {
if ( i > 3 ) {
if ( is.na(y[i-3]) == FALSE ) {
# some calculation F which depends on one or more of the previously
generated values in the series
y[i] = y[i-1]+x[i];
} else {
y[i] <- x[i];
}
}
}
y
}
e.g.
>
2007 Jan 30
4
Speed of for loops
Hi Everyone,
I have a question about for loops. If you have something like:
f <- function(x) {
y <- rep(NA,10);
for( i in 1:10 ) {
if ( i > 3 ) {
if ( is.na(y[i-3]) == FALSE ) {
# some calculation F which depends on one or more of the previously
generated values in the series
y[i] = y[i-1]+x[i];
} else {
y[i] <- x[i];
}
}
}
y
}
e.g.
>