[R] vector manipulations

From: Pete Dorothy <croero_at_gmail.com>
Date: Tue, 04 Mar 2008 18:38:16 +0100


I have simulated a set of data which i called "nir" (a vector).

I have created a function "logl" which calculates the log-likelihood.

logl is a function of 2 real parameters : "beta" and "zeta" (of length 1).

This function works perfectly well when I try for example "logl(0.1,0.2)"

Now if I try :


I get an error.

The problem seems to be that inside "logl", the following expression is calculated : "sum( log( beta+(nir-1)*zeta ) )". So it is a vector manipulation. The error tells me that "nir" is not the size of "zeta". Yet usually it is no problem since "length(zeta)=1".

When I replace "sum( log( beta+(nir-1)*zeta ) )" by a loop, I get no mistake. But I think it slows down the program.

Do you have an idea where the problem is ?

Thank you very much.

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