Created
November 1, 2015 07:26
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2D Gaussian function in Scala
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| import scala.math._ | |
| def gauss(dim: Int, sigma: Float): Array[Array[Float]] = { | |
| if(dim%2==0) | |
| throw new Exception("dim must be odd.") | |
| val arr = Array.fromFunction(i=>{ | |
| Array.fromFunction({j=> | |
| val x = (i - (dim-1)/2).toFloat | |
| val y = (j - (dim-1)/2).toFloat | |
| (exp(-1 * pow(x/sigma,2)) * exp(-1 * pow(y/sigma,2))).toFloat | |
| })(dim)})(dim) | |
| val ret = arr.map(a=>a.map(b=>b/sum(arr))) | |
| ret | |
| } | |
| def sum(arr: Array[Array[Float]]): Float = { | |
| arr.map(row=>row.sum).sum | |
| } |
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