Multiple Linear Regression - Cannot read property 'e' of nul

[FMGordillo]

First of all, thank you for this awesome lib!

Dataset (without null values)

,TV,radio,newspaper,sales
1,230.1,37.8,69.2,22.1
2,44.5,39.3,45.1,10.4
3,17.2,45.9,69.3,9.3
4,151.5,41.3,58.5,18.5
5,180.8,10.8,58.4,12.9
6,8.7,48.9,75,7.2
7,57.5,32.8,23.5,11.8

Then gathering X and Y to analyze later:

function dressData(csvData) {
	let X = [],
		Y = []
	csvData.forEach(row => {
		let k = []
		k.push(f(row['TV']))
		k.push(f(row['radio']))
		k.push(f(row['newspaper']))
		X.push(k)
		Y.push(f(row['sales']))
	})

	return [X, Y]
}

When I train the model, everything seems OK:

const ml = require('shaman')

function performRegression(X, Y) {
	const lr = new ml.LinearRegression(X, Y, {
		debug: true,
		algorithm: 'NormalEquation'
	})
	lr.train(err => {
		if (err) console.log(err)
		else predictOutput(lr)
	})
}

The prediction works when I use Linear Regression, but with Multiple Linear Regression it fails with the error in the title: Cannot read property 'e' of null.

Stack trace: at LinearRegression.predict (C:\Users\facun\xxxxx\node_modules\shaman\lib\linear_regression.js:263:17)

[FMGordillo]

Sorry, theory error. I was giving to predict only one parameter, when I had to give 3 instead.