[R] Writing Graphs to Files
Jerry Floren
jerry.floren at state.mn.us
Wed Jan 27 16:14:05 CET 2010
Greetings,
I am trying to write multiple .emf graphs to individual files.
Our data is from agricultural laboratories where individual soil samples are
tested for various plant nutrients, for example, ammonium nitrogen,
phosphorus, and zinc. Basically, there are three important columns: the
laboratory performing the tests, the type of test for each soil sample, and
the results
Lab_ID Anlysis_Soil Results
55001 AmmonumN_Soil1 5.3
55002 AmmoniumN_Soil2 5.4
55003 AmmoniumN_Soil3 8.8
55004 AmmoniumN_Soil4 6.9
55001 Phosphorus_ Soil1 15.3
55002 Phosphorus_ Soil2 25.8
55003 Phosphorus_ Soil3 37.8
55004 Phosphorus_ Soil4 46.9
55001 Zinc_ Soil1 1.3
55002 Zinc_ Soil2 1.4
55003 Zinc_ Soil3 1.8
55004 Zinc_ Soil4 1.9
Here is the introductory code:
#Set the working directory
setwd("C:\\Documents and Settings\\jfloren\\My Documents\\TestRSoil")
napt <- read.table(file = "./readin_all_for_2010_cert.csv ", header = TRUE,
sep = ",")
attach(napt)
## Set up the subset for statistics and graphs -- "myV" cycles through
Nitrogen_Soil1 to Zinc_Soil4. ##
myVars <- levels(Anlysis_Soil)
for (myV in myVars)
{
rsubset <- subset(napt, Anlysis_Soil %in% myV)
if (nrow(rsubset) > 8)
{
########### These are the start of the statistical results for each subset
########### with more than 8 labs submitting results #######
attach(rsubset)
count = length(Results)
amed = median(Results)
aMAD = mad(Results, constant
### Many more statistical results and a table is written. Then generate the
graphs ###
## INSERT FOR GRAPHS NEW MATERIAL
#Use "par(mfrow= 3,1) " to set up a report with 3 graphs in one columns (3 X
1 matrix)
par(mfrow=c(3,1))
plot(Results,main=myV)
# The following give lines at plus or minus 3 MAD units and + or – 15% from
median
abline(h=amed, lty="dashed")
abline(h=m2aMAD)
abline(h=p2aMAD)
abline(h=m4aMAD, lty ="dotted")
abline(h=p4aMAD, lty ="dotted")
hist(Results)
boxplot(Results, horizontal=TRUE)
### I see the graphs generated on the R GUI screen, but how do I get them
into individual .emf files?
### I think I need something like the following, but how do I substitute
"myV" instead of "Graphs.emf" into the file name?
dev.copy(win.metafile, file = "C:\\Documents and Settings\\jfloren\\My
Documents\\TestRSoil\\Graphs.emf", width = 7, height = 10, pointsize = 12)
dev.off()
Thanks,
Jerry Floren
Minnesota Department of Agriculture
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