[R] Loop FOR with histogram() from lattice

[Jeff Newmiller]

If you have read the Posting Guide, you will know that you should have read ALL the FAQs before posting your question.

http://cran.r-project.org/doc/FAQ/R-FAQ.html

That said, this particular FAQ applies to any library that depends on grid graphics, including lattice and ggplot2.
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Sent from my phone. Please excuse my brevity.

Xochitl CORMON <Xochitl.Cormon at ifremer.fr> wrote:

>Hi Jim,
>
>Thank you a lot. Is it a FAQ concerning lattice or FOR loop in general?
>
>Regards,
>
>Xochitl C.
>
>
>Le 05/06/2013 10:55, Jim Holtman a écrit :
>> This is an FAQ.  you have to explicitly 'print' the histogram:
>>
>> print(histogram(~ Mpool[[2]]$LngtClas | Mpool[[2]]$SpCode, type =
>"count", col = "lightgrey", xlab= "LngtClas", main = paste("Length
>distribution per species for Mpool", "2", sep = "_")))
>>
>> Sent from my iPad
>>
>> On Jun 5, 2013, at 4:37, Xochitl CORMON<Xochitl.Cormon at ifremer.fr> 
>wrote:
>>
>>> Hi all,
>>>
>>> I'm encountering a problem I do not understand on my data:
>>>
>>> library (lattice)
>>>
>>> Mpool1<- Table[Table$Subarea %in% c("52E9", "51E9"),]
>>> Mpool2<- Table[Table$Subarea %in% c("53F0", "52F0"),]
>>> Mpool3<- Table[Table$Subarea %in% c("51F0", "50F0"),]
>>> Mpool4<- Table[Table$Subarea %in% c("51F1", "52F1"),]
>>>
>>> Mpool<- list(Mpool1, Mpool2, Mpool3, Mpool4)
>>>
>>>
>>> histogram(~ Mpool[[2]]$LngtClas | Mpool[[2]]$SpCode, type = "count",
>col = "lightgrey", xlab= "LngtClas", main = paste("Length distribution
>per species for Mpool", "2", sep = "_"))
>>>
>>> #### This part works perfectly and I obtain the graph reprensenting
>Mpool2 length class count per species.
>>> #### Now when I want to automatize this with a "for" loop nothing is
>plotted.
>>>
>>> for (i in c(2)){
>>> windows()
>>> histogram(~ Mpool[[i]]$LngtClas | Mpool[[i]]$SpCode, type = "count",
>col = "lightgrey", xlab= "LngtClas", main = paste("Length distribution
>per species for Mpool", i, sep = "_"))
>>> print (i)
>>> }
>>>
>>> ### Running this loop I obtained  windows filled grey (no plot drawn
>at all) but the print (i) print a "2" as expected. I really dont
>understand what's wrong with the loop. There is no error message and no
>notification in R. You can find enclosed my data in txt file.
>>>
>>> Thank you very much for any help,
>>>
>>> Xochitl C.
>>>
>>> <><  <><  <><  <><
>>>
>>> Xochitl CORMON
>>> +33 (0)3 21 99 56 84
>>>
>>> Doctorante en sciences halieutiques
>>> PhD student in fishery sciences
>>>
>>> <><  <><  <><  <><
>>>
>>> IFREMER
>>> Centre Manche Mer du Nord
>>> 150 quai Gambetta
>>> 62200 Boulogne-sur-Mer
>>>
>>> <><  <><  <><  <><
>>>
>>> <Table.txt>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>
>______________________________________________
>R-help at r-project.org mailing list
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>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.