Loop FOR with histogram() from lattice

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 ?crit :

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.

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Xochitl CORMON
+33 (0)3 21 99 56 84

Doctorante en sciences halieutiques
PhD student in fishery sciences

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IFREMER
Centre Manche Mer du Nord
150 quai Gambetta
62200 Boulogne-sur-Mer

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<Table.txt>