C# method to scale values?

Question

I have a value range from 0 to 255.

There is a method that returns an array with a min and max values within this range, i.e: 13, 15, 20, 27, 50 ... 240 where 13 is the min and 240 is the max

I need to scale these values so that 13 becomes 0 and 240 becomes 255 and scale all the other values between them proportionally.

Is there any C# method that does that?

thanks!

Answer 1

Use this formula

y=mx+c

where m = (255-0)/(244-13) and c= -13*m

So you have to just transform the array as such

 public double[] GetScaling(double[] arr, double min, double max)
{
    double m = (max-min)/(arr.Max()-arr.Min());
    double c = min-arr.Min()*m;
    var newarr=new double[arr.Length];
    for(int i=0; i< newarr.Length; i++)
       newarr[i]=m*arr[i]+c;
    return newarr;
}