使用 r-script 连接 NodeJS 和 R 的启动问题

Question

I am trying to call a R-script from a js-file but I always get null as a return value

My folder-structure is as following

-R_test
--example.js
--helloWorld.R

example.js looks as follows:

var R = require("r-script");

var out = R('helloWorld.R')
    .callSync();

console.log(out);

and helloWorld.R looks as like this:

print("Hello World")

Looking at the only other question I could find similar to mine here my syntax is correct. Changing the js-file to

var R = require("r-script");

var out = R('helloWorld.R')
    .data("Hello World)
    .callSync();

console.log(out);

and helloWorld.R to

print(input)

should according to the readme of r-script print the data Hello World but it also just returns null

If there is any better way to run a R-script from a nodeJS-file please let me know

Answer 1

Thanks to dcruvolo I got it working. Here is how the js-file needs to look:

const { R } = require('@fridgerator/r-script')

let r = new R('./members.R')

r.call()
  .then(response => console.log(response))
  .catch(e => console.log('error : ', e))

And here is the .R-file:

members <- c(129, 1, 5,  3,  2,  1,  21,  1,  8,  7,  0,  1,  1,  1,  110,  0,  0,  5,  1,  0,  0,  0)

membersSorted <- sort(members, decreasing = TRUE)

# Graph cars using blue points overlayed by a line 
plot(membersSorted, type="o", col="blue")

# Create a title with a red, bold/italic font
title(main="Members", col.main="red", font.main=4)

png(filename="members.png")
plot(membersSorted, type="o", col="blue")
dev.off()