NODE-OPENCPU

node-opencpu is a OpenCPU client.

Example

var opencpu = require("opencpu");

opencpu.rCall("/library/datasets/R/mtcars/json", {}, function (err, data) {
    if (!err) {
        console.log(data[0].mpg + data[1].mpg); // => 42
    } else {
        console.log("opencpu call failed.");
    }
});

opencpu.rCall("/library/stats/R/rnorm/json", {
    n: 42,
    mean: 10,
    sd: 10
}, function (err, data) {
    if (!err) {
        console.log(data.length); // => 42
    } else {
        console.log("opencpu call failed.");
    }
});

Installation

To install with npm:

npm install opencpu

Tested with Node.js 10.x and OpenCPU 2.0.5 (with R 3.4.1).

Don't forget to start the opencpu server. For instance, from R console, after installing the package opencpu. The OpenCPU server will automatically be started when the opencpu package is attached. By default, the server starts at a random port. The default port used by node-opencpu is 5307.

> library(opencpu)
...
Welcome to OpenCPU!
> ocpu_start_server(5307)
[2017-07-16 08:35:32] OpenCPU single-user server, version 2.0.3
[2017-07-16 08:35:32] Starting 2 new worker(s). Preloading: opencpu, lattice, ggplot2
[2017-07-16 08:35:33] READY to serve at: http://localhost:5307/ocpu
[2017-07-16 08:35:33] Press ESC or CTRL+C to quit!
...