How to pass arguments from node to Rserve?

[liyuqi]

How to pass arguments from node to Rserve, that takes the string from database?

ex:

Rmongo.js

var field1 = req.query.fieldName
rio.sourceAndEval(__dirname + "/test.R", {
    entryPoint: "createDummyPlot",
    param: field1,
    callback: getPlot
});

test.R

xlab1<-list(args[0])
ylab1<-list(args[1])

plot(x,y,xlab=xlab1,ylab=ylab1)

i use Rserve for ploting image...

environment : node - Rserve - mongoDB environment = web - statistic - data

or take a look at https://github.com/kriloBT/nodeSS/tree/master/test_rmongo

[albertosantini]

Hey, I am out of town.

You may give a look at the second example (examples/ex2.js).

Basically you pass a json object and in R script you can extract the params using the RJSONIO package.

The same approach is used for the returned values.

Hope that helps.

[albertosantini]

Any news?

[liyuqi]

thanks alot

i solve it by using example/ex2.js.

the R reads exactly what args pass to

ex: Rmongo.js

var args = {
        db:'rmongodb',      collection:'iris',
        xdata:'Petal.Length',       ydata:'Petal.Width',
        xlab:'Petal.length',        ylab:'petal.width1'
    };

test.R

...
src = fromJSON(data);
cursor <-mongo.find(mongo,paste(src['db'],src['collection'],sep='.'),query='{}');
...
plot(res[,src['xdata']],res[,src['ydata']],xlab=src['xlab'],ylab=src['ylab']);