Loading data issues

问题

Datalink: Data

Code:

 ccfsisims <- read.csv(file = "F:/Purdue University/RA_Position/PhD_ResearchandDissert/PhD_Draft/GTAP-CGE/GTAP_NewAggDatabase/NewFiles/GTAP_ConsIndex.csv", header=TRUE, sep=",", na.string="NA", dec=".", strip.white=TRUE)
 ccfsirsts <- as.data.frame(ccfsisims)
 ccfsirsts[7:25] <- sapply(ccfsirsts[7:25],as.numeric)
 ccfsirsts <- droplevels(ccfsirsts)
 ccfsirsts <- transform(ccfsirsts,sres=factor(sres,levels=unique(sres)))
 ccfsirsts[1:5,]

Issue:

So, if you check the column "pSVIPM", the values displayed in the dataframe "ccfsirsts" are different from what is actually saved in the .csv file. This problem occured when uploading a different set of data.

In the initial upload, i.e. "ccfsisims", everything seems to check out. It is afterward that the problem occurs.

Any thoughts on why this happens?

回答1:

when you load ccfsisims do str(ccfsisims )...(get in the habit of doing this)

you will see that pSVIPM is a factor. So as.numeric will simply change the factors to numbers in the order the levels appear.

Because if you look at your csv you have #DIV/0! characters in there.

try it yourself:

> length(ccfsisims$pSVIPM[ccfsisims$pSVIPM == "#DIV/0!"])
[1] 350

来源：https://stackoverflow.com/questions/14880753/loading-data-issues