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arduino:math:max

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arduino:math:max [2013/02/15 20:45] (current)
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 +======max(x, y)   ======
 +
 +====Description   ====
 +
 +Calculates the maximum of two numbers.
 +
 +====Parameters   ====
 +
 +x: the first number, any data type
 +
 +y: the second number, any data type
 +
 +====Returns   ====
 +
 +The larger of the two parameter values.
 +
 +====Example   ====
 +<code arduino>sensVal = max(senVal, 20); // assigns sensVal to the larger of sensVal or 20
 +                           // (effectively ensuring that it is at least 20)</code>
 +====Note   ====
 +Perhaps counter-intuitively, max() is often used to constrain the lower end of a variable's range, while min() is used to constrain the upper end of the range.
 +
 +====Warning   ====
 +Because of the way the max() function is implemented, avoid using other functions inside the brackets, it may lead to incorrect results
 +
 +<code arduino>
 +max(a--, 0);   // avoid this - yields incorrect results
 +
 +a--;           // use this instead -
 +max(a, 0);     // keep other math outside the function
 +</code>
 +
 +
 +====See also   ====
 +
 +* [[arduino:math:Min]]
 +* [[arduino:variable scope and qualifiers:Constrain]]
 +
 +
 +
 +Source: arduino.cc
  
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arduino/math/max.txt · Last modified: 2013/02/15 20:45 (external edit)

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