Hi,
Not sure if this helps.
deviceSummary <- data.frame(item = character(0) , value = numeric(0) , unit =
character(0) ,stringsAsFactors=FALSE)
newlst<- list("primitiveSpace",1.1,"mm2")
deviceSummary[nrow(deviceSummary)+1,]<- newlst
newlst2<- list("primitiveSpace",2.2,"mm2")
deviceSummary[nrow(deviceSummary)+1,]<- newlst2
str(deviceSummary)
#'data.frame': 2 obs. of 3 variables:
# $ item : chr "primitiveSpace" "primitiveSpace"
# $ value: num 1.1 2.2
# $ unit : chr "mm2" "mm2"
deviceSummary
# item value unit
#1 primitiveSpace 1.1 mm2
#2 primitiveSpace 2.2 mm2
A.K.
----- Original Message -----
From: "rolf.kem...@renesas.com" <rolf.kem...@renesas.com>
To: r-help@r-project.org
Cc:
Sent: Tuesday, October 1, 2013 9:24 AM
Subject: [R] Basic help on DF creation row by row
Dear Experts
I'm very new to R and after some days or reading and testing I tried to make
my first small application (and failed ...)
In general I would like to work with sqldf , ggplot2 to create some graphical
output.
At present I got stuck with this:
PROG
#############################################################################
deviceSummary <- data.frame(item = character(0) , value = numeric(0) , unit =
character(0) )
print ( sapply(deviceSummary, class))
newRow <- c("primitiveSpace", 1.1 , "mm2")
deviceSummary <-rbind(deviceSummary , newRow )
print(deviceSummary)
newRow <- c("primitiveCellSpace", 2.2 , "mm2")
deviceSummary <-rbind(deviceSummary , newRow )
print(deviceSummary )
OUTPUT
############################################################################
item value unit
"factor" "numeric" "factor"
X.primitiveSpace. X.1.1. X.mm2.
1 primitiveSpace 1.1 mm2
X.primitiveSpace. X.1.1. X.mm2.
1 primitiveSpace 1.1 mm2
2 <NA> <NA> mm2
Warning messages:
1: In `[<-.factor`(`*tmp*`, ri, value = "primitiveCellSpace") :
invalid factor level, NA generated
2: In `[<-.factor`(`*tmp*`, ri, value = "2.2") :
invalid factor level, NA generated
Inserting the first record went fine , but the next one will fail as you can
see.
Repeating only the first one (value1.1) went fine.
May be my imagination of DF is totally wrong. Hope someone can guide me.
Thanks a lot
Rolf
Rolf Kemper, Manager, Mixed Signal Design, Networking, Renesas Electronics
Europe GmbH, , Arcadiastr. 10, 40472, Duesseldorf, Germany, Phone:+49 211
6503-1475, Fax:+49 211 6503-1540, mailto:rolf.kem...@renesas.com,
http://www.renesas.eu
This message is intended only for the use of the address...{{dropped:24}}
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