Dear all,
I have a code that looks like the following (I am sorry that this is not a
reproducible example)
indexSkipped<-NULL
....code Skipped that might alter indexSkipped
if (length(indexSkipped)==0)
spatial_structure<-spatial_structures_from_measurements(DataList[[i]]$Lon,DataList[[i]]$Lat,meanVector)
else
spatial_structure<-spatial_structures_from_measurements(DataList[[i]]$Lon[-indexSkipped],DataList[[i]]$Lat[-indexSkipped],meanVector)
#
What I am doing here is that I am processing files. Every files has a
measurement table and Longtitude and Latitude fields. If one file is marked as
invalid I keep a number of of the skipped index so to remove the element of the
Longtitude and Latitide vectors.
1) That works correct, I was just wondering if it would be possible to remove
some how the given if statement and initialize the indexSkipped in such a way
so
the DataList[[i]]$Lon[-indexSkipped],DataList[[i]]$Lat[-indexSkipped] do
nothing, aka remove no element, in case the indexSkipped remains unchanged (in
its initial value).
2) When u define a variable as empty, I usually use NULL, how I can check
afterwords if that holds or not. If I use the
(indexSkipped==NULL)
logical(0)
this does not return true or false. How I can do that check?
Iwould like to thank you in advance for your help
B.R
Alex
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