On Oct 17, 2007, at 10:18 AM, Waterman, DG ((David)) wrote:
> I agree. Avoid the lines like:
> iv = c( iv, min(i, j) )
>
> I had code that was sped up by 70 times after fixing the size of my
> output object before entering a loop.
I'm in the process of replacing that very kind of command. In my
case, I'm trying to iterate over a non-integer sequence that doesn't
begin at 1.
x<-seq(15,25,0.10)
So when I'm iterating over that sequence in my for loop, I don't have
nice, easy integers that I can also use for the assignment to my
vector. Is there a way to know where I am in the for loops progress
through the vector x, without having to create a separate variable
that I increment each time the loop executes? Something along the
lines of this:
y<-numeric(length(x))
for(i in x) {
y[i] <- GBSGreeks(Selection = 'delta', TypeFlag="c", S=i, X=20,
Time=1/12, r=.05, b=.05, sigma=0.4)
}
But that obviously doesn't work. The vector x is length=101. My
vector assignment only works on the 11 integers from 15 to 25.
Is there a clever way to fix this without the use of a separate
variable to track the loops progress through the vector x and for
assignment to the equal size y vector?
thanks
James
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