[GRASS-stats] Create new vectors within a (double) loop in R

[Nikos Alexandris]

Hi list.

(Apologies in advance since this is actually a non-spatial R-related
question.)

I use the following one-liner to create a new vector made out of 10
values. Each value is _some_ sum of a column from a "Source" data frame.

# code:
for (i in 1:10) print ( sum ( !is.na (Source[ ,i]) ) ) -> TargetV[i]

I want to construct a loop over a set of "Source" data frames ( say they
are 10 ) and create, in total, 10 new vectors at once. All new vectors
will be made out of 10 values as in the example above.

Finally, I would like to have all this in a custom function (once it
works line-per-line).

I am stuck on the following "code" which gives me 10 new vectors but
each of them has only 1 numeric value instead of the desired 10.

# the data are:
# "classifications" is _just_ a list with names
# 10 vectors with a "_thresholds" suffix contain 10 columns with values
I want to use
# I want to create 10 vectors named with a "sums" suffix.


# the code:
# loop over Source data frames
for (x in classifications) {

 # loop over sequence 1 to 10
 for (i in 1:10)

  # store sum's per "source" column
  assign ( (paste ( x, "_sums", sep = "" )[i],
    sum ( !is.na (
      get ( paste ( x, "_thresholds", sep = "" ) )[ ,i]
      )
    )
  )
}


Question:

What is the correct way to create new variable(s) within a (double)
loop? The command "paste()" prints its results within quotes which, I
think, is a problem here??

Thanks, Nikos