Map range: Difference between revisions
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</pre> |
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=={{header|Groovy}}== |
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<lang groovy> |
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def mapRange(a1, a2, b1, b2, s) { |
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b1 + ((s - a1) * (b2 - b1)) / (a2 - a1) |
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} |
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(0..10).each { s -> |
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println(s + " in [0, 10] maps to " + mapRange(0, 10, -1, 0, s) + " in [-1, 0].") |
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} |
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</lang> |
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Output: |
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<pre> |
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0 in [0, 10] maps to -1 in [-1, 0]. |
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1 in [0, 10] maps to -0.9 in [-1, 0]. |
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2 in [0, 10] maps to -0.8 in [-1, 0]. |
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3 in [0, 10] maps to -0.7 in [-1, 0]. |
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4 in [0, 10] maps to -0.6 in [-1, 0]. |
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5 in [0, 10] maps to -0.5 in [-1, 0]. |
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6 in [0, 10] maps to -0.4 in [-1, 0]. |
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7 in [0, 10] maps to -0.3 in [-1, 0]. |
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8 in [0, 10] maps to -0.2 in [-1, 0]. |
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9 in [0, 10] maps to -0.1 in [-1, 0]. |
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10 in [0, 10] maps to 0 in [-1, 0]. |
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</pre> |
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=={{header|Haskell}}== |
=={{header|Haskell}}== |
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Rather than handling only floating point numbers, the mapping function takes any number implementing the <tt>Fractional</tt> typeclass, which in our example also includes exact <tt>Rational</tt> numbers. |
Rather than handling only floating point numbers, the mapping function takes any number implementing the <tt>Fractional</tt> typeclass, which in our example also includes exact <tt>Rational</tt> numbers. |
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