将参数从R返回到bash(Returning an argument from R to bash)

将参数从R返回到bash(Returning an argument from R to bash)

我有以下bash脚本，其中调用R脚本

#!/bin/bash declare -x a=33 declare -x b=1 declare -x c=0 Rscript --vanilla MWE.R $a $b $c echo $a $b $c

我想修改R脚本中的bash变量并在bash脚本中返回它们的修改后的值，因为我随后将修改后的变量传递给其他地方。 R脚本是

#!/usr/bin/env Rscript args = commandArgs(trailingOnly=TRUE) Rb = as.numeric(args[2]) Rc = as.numeric(args[3]) Rb = Rb + 1 Rc = Rc + 1 args[2]=Rb args[3]=Rc print(c(args[1],args[2],args[3]))

但是， print和echo的输出分别是：

[1] "33" "2" "1" 33 1 0

这表明新值不会从R传递给bash。 我究竟做错了什么？

I have the following bash script in which an R script is called

#!/bin/bash declare -x a=33 declare -x b=1 declare -x c=0 Rscript --vanilla MWE.R $a $b $c echo $a $b $c

I want to modify the bash variables in the R script and return their modified values in the bash script because I am then passing the modified variables somewhere else. The R script is

#!/usr/bin/env Rscript args = commandArgs(trailingOnly=TRUE) Rb = as.numeric(args[2]) Rc = as.numeric(args[3]) Rb = Rb + 1 Rc = Rc + 1 args[2]=Rb args[3]=Rc print(c(args[1],args[2],args[3]))

However, the output of the print and echo respectively are:

[1] "33" "2" "1" 33 1 0

which shows that the new values aren't passed from R to bash. What am I doing wrong?

最满意答案

由于Rscript不允许环境变量操作，因此您需要从bash程序中捕获R输出。

许多可能性之一是使用array ：

#!/bin/bash declare a=33 declare b=1 declare c=0 declare -a RESULT RESULT=($(Rscript --vanilla MWE.R $a $b $c)) a=${RESULT[1]} b=${RESULT[2]} c=${RESULT[3]}

As Rscript does not allow environment variable manipulation you will need to capture the R output from the bash program.

One of the many possibilities is to use an array:

#!/bin/bash declare a=33 declare b=1 declare c=0 declare -a RESULT RESULT=($(Rscript --vanilla MWE.R $a $b $c)) a=${RESULT[1]} b=${RESULT[2]} c=${RESULT[3]}