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我有一个简单的 csv 文件，其中包含 2 列数字，标题为“Colli_On”和“Colli_Off”。我编写了一个简单的 Rscript，它传递了 3 个参数——文件名和列名——并且想生成一个平淡无奇的奥特曼图。但是我收到以下错误消息

> Error in plot.window(...) : need finite 'xlim' values
Calls: baplot ... do.call -> plot -> plot.default -> localWindow -> plot.window
In addition: Warning messages:
1: In min(x) : no non-missing arguments to min; returning Inf
2: In max(x) : no non-missing arguments to max; returning -Inf
3: In min(x) : no non-missing arguments to min; returning Inf
4: In max(x) : no non-missing arguments to max; returning -Inf

我哪里错了？

   #!/usr/bin/Rscript
# -*- mode: R =*-

#script passes 3 arguments filename and 2 columns and does bland altman analysis
#Example BA /home/moadeep/Data/sehcat.csv Colli_on Colli_off

args <- commandArgs(TRUE)
mydata <- read.csv(file=args[1],head=TRUE,sep="\t")

baplot = function(x,y){

  bamean = (x+y)/2
  badiff = (y-x)

  plot(badiff~bamean, pch=20, xlab="mean", ylab="difference")
# in the following, the deparse(substitute(varname)) is what retrieves the
# name of the argument as data
  title(main=paste("Bland-Altman plot of collimator x and y\n",
    deparse(substitute(x)), "and", deparse(substitute(y)),
    "standardized"), adj=".5")
#construct the reference lines on the fly: no need to save the values in new 
# variable names
  abline(h = c(mean(badiff), mean(badiff)+1.96 * sd(badiff),
    mean(badiff)-1.96 * sd(badiff)), lty=2)
} 

pdf(file="test.pdf")
baplot(mydata$args[2],mydata$argss[3])
dev.off()
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1 回答 1

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问题在于这一行：

baplot(mydata$args[2],mydata$argss[3])

更别提错字了...当您要求 时mydata$args[2]，R 会在您的 data.frame 中查找名为“args”的列。显然，没有这样的列，所以你得到NULL. 从 data.frame 中提取列的编程方式是使用[. 正确的语法应该是：

baplot(mydata[args[2]],mydata[args[3]])

那应该可以解决您的问题。

(Also note that the [ operator, unlike $, will throw an error if you are trying to extract a column that does not exist: a preferable feature IMHO.)

于 2012-12-09T01:06:07.417 回答