33 lines
1.2 KiB
Markdown
33 lines
1.2 KiB
Markdown
# Map
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Re-maps a number from one range to another. That is, a value of ``from low`` would get mapped to ``to low``, a value of ``from high`` to ``to high``, values in-between to values in-between, etc.
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Does not constrain values to within the range, because out-of-range values are sometimes intended and useful. The `math->clamp` function may be used either before or after this function, if limits to the ranges are desired.
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```sig
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pins.map(0, 0, 4, 0, 1023);
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```
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### Parameters
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* ``value``: [Number](/microbit/reference/types/number) - the value to map
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* ``from low``: [Number](/microbit/reference/types/number) - lower bound of the origin interval
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* ``from high``: [Number](/microbit/reference/types/number) - upper bound of the origin interval
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* ``to low``: [Number](/microbit/reference/types/number) - lower bound of the target interval
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* ``to high``: [Number](/microbit/reference/types/number) - upper bound of the target interval
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## Example
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Map the value read from the analog pin ``P0`` to an LED index between ``0`` and ``4``.
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```blocks
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let value1 = pins.analogReadPin(AnalogPin.P0)
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let index = pins.map(value1, 0, 1023, 0, 4)
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led.plot(0, index)
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```
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### See also
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[analog read pin](/microbit/reference/pins/analog-read-pin)
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