Created
November 22, 2011 21:01
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LinearFit full code
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| object LinearFit { | |
| def through (points : (Double,Double)*) : (Double, Double) = { | |
| val (xTotal,yTotal) = ((0.0,0.0) /: points) { case ((xA, yA), (x, y)) => (xA + x, yA + y) } | |
| val (xAverage, yAverage) = (xTotal / points.size , yTotal / points.size) | |
| val (squareSumXX, squareSumXY) = ((0.0,0.0) /: points) { | |
| case ((ssxx, ssxy), (x, y)) => (ssxx + pow(x - xAverage, 2), | |
| ssxy + (x - xAverage) * (y - yAverage)) | |
| } | |
| val b = (squareSumXY / squareSumXX) | |
| (yAverage - b * xAverage, b) | |
| } | |
| def through (points : Map[Double,Double]) : (Double, Double) = { | |
| through(points.toSeq:_*) | |
| } | |
| } |
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