Dear R Users.
This seems like a simple task, but I'm stuck.
I have a list with 3 elements: (2 vectors and 1 matrix). I wish to extract
each of these data elements using index subscripts and multiply them with a
vector multiplier.
What I have:
> betas
[1] 0.01 0.01 0.01
> LData[1]
$int
[1] 1 1 1 1 1 1 1 1 1 1
$date
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 152 153 154 155 156 157 158 159 160 161
[2,] 163 164 165 166 167 168 162 163 164 165
$land
[1] 0 0 0 0 1 0 1 1 0 0
What I'm trying to do:
I would like to have the elements in the vector, betas[1:3] multiplied by
corresponding data elements in LData[[1:3]].
This is how I initially try to do it, but does not work:
> probs <- betas[1:3] * LData[[1:3]]
Error in LData[[1:3]] : recursive indexing failed at level 2
Apparently, the above is not allowed. But, if I try
> probs <- betas[1:3] * LData[1:3]
Error in betas[1:3] * LData[1:3] :
non-numeric argument to binary operator
I can see that the list keys get in the way of the multiplication operation.
There just has to be a way to do this. I have searched archives and find
plenty of examples of extracting data elements individually, and even
extraction of multiple vector elements (unfortunately one of mine is an
matrix), but not my situation. In particular, no examples attempting to
vectorize the math operation. yapply and mapply don't seem to be what I want,
but what I've read of them confuses me. Want to avoid for loops, unless its
the only way.
All help is much appreciated!
Thanks.
*******************************************************************
Jeff P. Hollenbeck
USGS Forest and Rangeland Ecosystem Science Center
3200 SW Jefferson Way
Corvallis, OR 97331
541-750-0966
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