7 days confusion over lists
Could you make a reproducible example? [http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example] I can't run any of your code as is. A few comments inline.
On Thu, Jul 5, 2012 at 9:44 AM, Wageningen-eR <igor.milosavljevic at wur.nl> wrote:
Hello, I am a Masters student and I am working on my thesis modelling smallholder farms using a program in R. I have modified the original code and I am having some issues with lists that I cannot figure out. Originally, I had list file defining lists such as: Param, Crop1, Crop1, Soil, etc. (ex. Param <- list() ). Their subsets were listed as Crop1$CContent for example and there was quite a few of them. There is a run file that gets the list file going in the following code: #--Initialising the lists to store variable values tmp <- init_lists() Param <- tmp[[1]] Crop1 <- tmp[[2]] Fert <- tmp[[3]] Meteo <- tmp[[4]] Soil <- tmp[[5]] RainPattern <- tmp[[6]] Crop2 <- tmp[[7]] Cropres <- tmp[[8]] rm(tmp) The problem here is that the lists get confused with each other; that is elements of Soil appear in Crop2. In the run file, I changed the order of the lists (for example Fert <- tmp[[5]] and Crop2 <-tmp[[3]]) and it changes which ones are confused with what; with some lists not being confused at all. I cannot find why this is a problem as the tmps are removed at the end of the command list shown below and each element is clearly defined as a part of its given list with (list name)$(Sublist maybe)$(specific element name) Either way, I changed the original lists to be more specific, for example: Crop$ <- list( CContent <- NA, NContent <- NA, PContent <- NA, KContent <- NA, K <- list( uptakegivenN, uptakegivenP), dryMatterContent ...etc.
This almost certainly doesn't work. "Crop$ <- ... " should be a syntax error.
The issue then became that it stops at a certain point accepting the assigned values and keeps them as null. That is, the list contains an element that states Crop2$minYieldN <- NA but the value becomes NULL when it is run. Also, the list, say Param, contains both: [[1]] [1] NA [[2]] [1] NA [[3]] [[3]][[1]] [1] NA [[3]][[2]] [1] NA and some of the value names (up to a point) $inertCRTR [1] 0.001 $humificationFactor [1] 0.25 $fractionStabilisedSOMC [1] 0.2 $growthEffectMicroorganisms [1] 0.6 Is it perhaps that the list is too long? Please let me know if anything comes to mind, it would be great help.
No, it's not a length thing. It might be a partial matching thing though. x <- list() x$a <- 5 x$ab <- 10 x$ba <- 15 print(x$b) # where's x$b? It's recommended to use the double `[[` in programming applications to avoid this trouble. Best, Michael
Thank you! Regards, -Igor Milosavljevic Wageningen University and Research Center -- View this message in context: http://r.789695.n4.nabble.com/7-days-confusion-over-lists-tp4635489.html Sent from the R help mailing list archive at Nabble.com.
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