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Map range: Difference between revisions
Add Swift
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(Add Swift) |
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11. | 10 10 |
+----------+</pre>
=={{header|Swift}}==
<lang Swift>import Foundation
func mapRanges(_ r1: ClosedRange<Double>, _ r2: ClosedRange<Double>, to: Double) -> Double {
let num = (to - r1.lowerBound) * (r2.upperBound - r2.lowerBound)
let denom = r1.upperBound - r1.lowerBound
return r2.lowerBound + num / denom
}
for i in 0...10 {
print(String(format: "%2d maps to %5.2f", i, mapRanges(0...10, -1...0, to: Double(i))))
}</lang>
{{out}}
<pre> 0 maps to -1.00
1 maps to -0.90
2 maps to -0.80
3 maps to -0.70
4 maps to -0.60
5 maps to -0.50
6 maps to -0.40
7 maps to -0.30
8 maps to -0.20
9 maps to -0.10
10 maps to 0.00</pre>
=={{header|Tcl}}==
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