R help - Sep 2009 - if else and loop for code in R

I am using if else and loop to sortout the data set that is the values  
less than o or more than 100 will be chosen.I could not get outTable  
with loop.
Please help me to correct the code:
I USED:

# Read
a_data <- read.table("D:/SNP/copy.sas", header=T,
sep="\t")
tr <- a_data$truck
ca <- a_data$cars
length <- nrow(a_data)
outTable <- matrix(nrow=length,ncol=3)

stat <- for (i in 1:length) {
if (tr<0) {0} else
if (ca>100) {0}else
{ca}
outTable <- c(i, stat, tr)
}
# Writing the output file
   colnames(outTable) <- c("number", "stat",
"tr")
    
write.table(outTable,"D:/SNP/mixed.txt",append=FALSE,quote=FALSE,sep='\t',
row.names=F)
# Graph
plot(stat, type="o", col="red", axes=FALSE, ann=FALSE)
# Create a title with a red, bold/italic font title(main="Autos",  
col.main="red", font.main=4)
# Start PNG device driver to save output to figure.png
png(filename="D:/SNP/figure.png", height=295, width=300,
bg="white")
.....................
COMPLAIN
Error: object 'stat' not found
In addition: Warning message:
In if (tr < 0) { :
   the condition has length > 1 and only the first element will be used
...................

Thank alot

It looks like you are trying to mimic the SAS data step. In R you can
vectorise this.

a_data <- read.table("D:/SNP/copy.sas", header=T,
sep="\t")
a_data$stat <- with(a_data, ifelse(truck < 0, 0, ifelse(cars > 100, 0,
cars)))
a_data$i <- seq_len(nrow(a_data))
outTable <- a_data[, c("i", "stat", "truck")]

HTH,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Minh Duy Mai
Verzonden: vrijdag 25 september 2009 13:53
Aan: r-help at R-project.org
CC: minhmaiduy at yahoo.com
Onderwerp: [R] if else and loop for code in R

I am using if else and loop to sortout the data set that is the values
less than o or more than 100 will be chosen.I could not get outTable
with loop.
Please help me to correct the code:
I USED:

# Read
a_data <- read.table("D:/SNP/copy.sas", header=T,
sep="\t") tr <-
a_data$truck ca <- a_data$cars length <- nrow(a_data) outTable <-
matrix(nrow=length,ncol=3)

stat <- for (i in 1:length) {
if (tr<0) {0} else
if (ca>100) {0}else
{ca}
outTable <- c(i, stat, tr)
}
# Writing the output file
   colnames(outTable) <- c("number", "stat",
"tr")
    
write.table(outTable,"D:/SNP/mixed.txt",append=FALSE,quote=FALSE,sep='\t
',
row.names=F)
# Graph
plot(stat, type="o", col="red", axes=FALSE, ann=FALSE) #
Create a title
with a red, bold/italic font title(main="Autos",
col.main="red",
font.main=4) # Start PNG device driver to save output to figure.png
png(filename="D:/SNP/figure.png", height=295, width=300,
bg="white")
.....................
COMPLAIN
Error: object 'stat' not found
In addition: Warning message:
In if (tr < 0) { :
   the condition has length > 1 and only the first element will be used
...................

Thank alot

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