Reference.Map History
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August 24, 2012, at 05:51 PM
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Changed line 40 from:
[@
to:
(:source lang=arduino:)
Changed lines 50-52 from:
@]
to:
(:sourceend:)
February 06, 2010, at 03:26 AM
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Changed lines 70-72 from:
* [[Mathh|math.h]]
to:
February 05, 2010, at 09:20 PM
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Changed lines 69-70 from:
* [[constrain]]()
to:
* [[constrain]]()
* [[Mathh|math.h]]
* [[Mathh|math.h]]
August 04, 2008, at 03:03 PM
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Changed lines 13-15 from:
The function also handles negative numbers well so
this example
this example
to:
The function also handles negative numbers well, so
that this example
that this example
August 03, 2008, at 11:55 PM
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Changed lines 16-17 from:
[@ y = map(x, 1, 50, -50, -100); @]
to:
[@ y = map(x, 1, 50, 50, -100); @]
August 03, 2008, at 11:55 PM
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Changed lines 38-39 from:
!!!!Examples
to:
!!!!Example
Added line 41:
/* Map an analog value to 8 bits (0 to 255) */
August 03, 2008, at 11:53 PM
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Added line 10:
August 03, 2008, at 11:51 PM
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Changed lines 19-20 from:
The map() function uses integer math so will not generate fractions, when the math might indicate that is should do so. Fractional remainders are truncated, and are not rounded or averaged.
to:
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.
Deleted lines 64-67:
August 03, 2008, at 11:50 PM
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Changed lines 7-9 from:
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 constrained ranges are desired.
Note that the "lower bounds" of either range may be larger or smaller than the "upper bounds" so the function may be used to reverse a range of numbers, for example
Note that the "lower bounds" of either range may be larger or smaller than the "upper bounds" so the function may be used to reverse a range of numbers, for example
to:
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
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
August 03, 2008, at 11:47 PM
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Changed lines 50-54 from:
Note that the lower and upper bounds are just markers that define the ranges
to:
August 03, 2008, at 11:47 PM
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Added lines 9-20:
Note that the "lower bounds" of either range may be larger or smaller than the "upper bounds" so the 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
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 is should do so. Fractional remainders are truncated, and are not rounded or averaged.
[@ y = map(x, 1, 50, 50, 1); @]
The function also handles negative numbers well so
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 is should do so. Fractional remainders are truncated, and are not rounded or averaged.
Added lines 49-54:
Note that the lower and upper bounds are just markers that define the ranges
August 03, 2008, at 11:30 PM
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Changed lines 7-8 from:
Does not constrain values to within the range, because out-of-range values are sometimes intended and useful.
to:
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 constrained ranges are desired.
Changed lines 25-26 from:
!!!!Example
to:
!!!!Examples
Changed lines 37-38 from:
!!! Apendix
to:
!!! Appendix
August 03, 2008, at 02:35 PM
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Deleted line 36:
August 03, 2008, at 02:34 PM
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Added lines 38-55:
!!! Apendix
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;
}
@]
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;
}
@]
April 23, 2008, at 12:44 AM
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Changed lines 7-8 from:
Does not constrain values to within the range, because out-of-range values are something intended and useful.
to:
Does not constrain values to within the range, because out-of-range values are sometimes intended and useful.
March 29, 2008, at 10:31 AM
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Added lines 25-37:
!!!!Example
[@
void setup() {}
void loop()
{
int val = analogRead(0);
val = map(val, 0, 1023, 0, 255);
analogWrite(9, val);
}
@]
[@
void setup() {}
void loop()
{
int val = analogRead(0);
val = map(val, 0, 1023, 0, 255);
analogWrite(9, val);
}
@]
March 29, 2008, at 10:15 AM
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Added lines 1-27:
!!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 something intended and useful.
!!!!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.
!!!!See Also
* [[constrain]]()
!!!!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 something intended and useful.
!!!!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.
!!!!See Also
* [[constrain]]()
