Thank you all- with your suggestions I was able to get this simulation
to run- sorry, next time I'll post some reproduceable code- it had been
a while since I posted, so I forgot about that.
Best,
Mike
On 9/15/2011 1:40 PM, David Winsemius wrote:
On Sep 15, 2011, at 1:50 PM, Mike Treglia wrote:
Dear List Members,
I have created a function to run a simulation based on a given set of
values within a vector, such that I run the function like this:
new.data<-sapply(vector, function)
In which I run 'function' on every value within a vector that I
created. The result is a matrix of 1000 rows, and as many columns as
the length of the vector.
I modified the function to utilize two given values, such that it is:
function(x,y), and I want to run this function for not only a range
of values of 'x', but a range of values of 'y' as well, such that for
each value of 'y', I'd create another 1000 rows in the matrix. I was
trying to loop this, but in doing so, it looks like I just keep
creating datasets and replacing them with datasets for subsequent 'y'
values, rather than adding new rows. The structure of my current loop
is below. Any suggestions on what to change to accomplish what I
want? Would it be good to create a dataframe first and then somehow
add these new rows to the dataframe? Also, is it appropriate to have
the 'i' in the sapply statement?
for (i in c(seq(10,100,10))){
The c() call is extraneous.
new.data<-sapply(vector, function, i)
Perhaps:
# scrap the entire for loop(sapply()) mess and use this
newdata <- outer(Y=seq(10,100,10), X=vector, FUN=function)
Or:
mapply(function, expand.grid(x=vector, y=seq(10,100,10) ) )
# which is sort of like your last notion,
All of this is untested in the absence of a reproducible example but
you definitely should work through the examples on:
?outer
?mapply
}
Please let me know if more detail on my code would be helpful- I was
just trying to keep it simple and focus on what I saw as the problem
at hand for now.
Thank you for your help.
Sincerely,
Mike Treglia
--
Michael Treglia
Applied Biodiversity Sciences NSF-IGERT Program
Wildlife and Fisheries Sciences
Texas A&M University
Lab: (979)862-7245
ml...@tamu.edu
http://people.tamu.edu/~mlt35
______________________________________________
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PLEASE do read the posting guide
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David Winsemius, MD
West Hartford, CT
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
