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-.. _arduino-map:
-
-map(value, fromLow, fromHigh, toLow, toHigh)
-============================================
-
-Description
------------
-
-Re-maps a number from one range to another. That is, a **value** of
-**fromLow** would get mapped to **toLow**, a value of **fromHigh**
-to **toHigh**, values in-between to values in-between, etc.
-
-
-
-Does not constrain values to within the range, because out-of-range
-values are sometimes intended and useful. The constrain() function
-may be used either before or after this function, if limits to the
-ranges are desired.
-
-
-
-Note that the "lower bounds" of either range may be larger or
-smaller than the "upper bounds" so the map() function may be used
-to reverse a range of numbers, for example
-
-
-
-``y = map(x, 1, 50, 50, 1);``
-
-
-
-The function also handles negative numbers well, so that this
-example
-
-
-
-``y = map(x, 1, 50, 50, -100);``
-
-
-
-is also valid and works well.
-
-
-
-The map() function uses integer math so will not generate
-fractions, when the math might indicate that it should do so.
-Fractional remainders are truncated, and are not rounded or
-averaged.
-
-
-
-Parameters
-----------
-
-value: the number to map
-
-
-
-fromLow: the lower bound of the value's current range
-
-
-
-fromHigh: the upper bound of the value's current range
-
-
-
-toLow: the lower bound of the value's target range
-
-
-
-toHigh: the upper bound of the value's target range
-
-
-
-Returns
--------
-
-The mapped value.
-
-
-
-Example
--------
-
-::
-
- /* Map an analog value to 8 bits (0 to 255) */
- void setup() {}
-
- void loop()
- {
- int val = analogRead(0);
- val = map(val, 0, 1023, 0, 255);
- analogWrite(9, val);
- }
-
-
-
-Appendix
-~~~~~~~~
-
-For the mathematically inclined, here's the whole function
-
-
-
-::
-
- long map(long x, long in_min, long in_max, long out_min, long out_max)
- {
- return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
- }
-
-
-
-See Also
---------
-
-
-- `constrain <http://arduino.cc/en/Reference/Constrain>`_\ ()