View source for Moodle: Math Function untuk Calculated Questions

The calculated question type could benefit of the EvalMath module to increase the math functions useable in the Calculated, Simple calculated et Multiple choice calculated question types.
==Available functions==

Calculated questions can use more than simple arithmetic operators. 
The following functions are allowed in versions 1.5 and newer.
In 2,9 we should continue to support the previous functions unless they can be unsafe.
All functions will use either the EvalMath code or a more specific CalculatedEvalMath code.
In the following table 
to be improved as ... there is some ambiguity on  columns names (
  # means that the function exists. 
  new means that the function needs to be created in EvalMath or only in  CalculatedEvalMath. (... to be explained more clearly )
   OK  will be used in test column to confirm that this property has been coded and testing code have been added in  2.9
   NO i.e. no more supported in 2,9
{| width="97%" border="1px"
!Function
!1,5+
!Math
lib
!Eval
Math
!Calc
!coded
!tested
!Explanation
|-
|abs
| #
| #
| #
| #
|
|
|Absolute value
|-
|acos
| #
| #
| #
| #
|
|
|Arc cosine -- output in radians.
|-
|acosh
| #
| #
| #
| #
|
|
|Inverse hyperbolic cosine -- output in radians.
|-
|asin
| #
| #
| #
| #
|
|
|Arc sine -- output in radians.
|-
|asinh
| #
| #
| #
| #
|
|
|Inverse hyperbolic sine.-- output in radians.
|-
|atan2
| #
| #
|
|
|
|
|Arc tangent of two variables -- pass in two values like (y, x), and you'll get the atan(y/x), adjusted to the proper quadrant. (Note: The variables are in the reverse order to atan2(x,y) in Excel) Output is radians.
|-
|atan
| #
| #
| #
| #
|
|
|Arc tangent -- output in radians.   
|-
|atanh
| #
| #
| #
| #
|
|
|Inverse hyperbolic tangent-- output in radians.
|-
|bindec
| #
| #
|
|
|
|
|Binary to decimal
|-
|ceil
| #
| #
| #
| #
|
|
|Round fractions up
|-
|cos
| #
| #
| #
| #
|
|
|Cosine -- in radians!!!  Convert your degree measurement to radians before you take the cos of it.
|-
|cosh
| #
| #
| #
| #
|
|
|Hyperbolic cosine -- in radians!!!  Convert your degree measurement to radians before you take the cosh of it.
|-
|decbin
| #
| #
|
|
|
|
|Decimal to binary
|-
|decoct
| #
| #
|new
|
|
|
|Decimal to octal
|-
|deg2rad
| #
| #
|new
|
|
|
|Converts the number in degrees to the radian equivalent
|-
|exp
| #
| #
| #
| #
|
|
|Calculates the exponent of e
|-
|expm1
|
|
|new
|
|
|
|Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
|-
|floor
|
| #
| #
| #
|
|
|Round fractions down
|-
|fmod
| #
|new
|
|
|
|
|Returns the floating-point modulus of two numbers - i.e. the remainder when the first is divided by the second.
|-
|is_finite
| #
| #
|new
|
|
|
|Finds whether a value is a legal finite number
|-
|is_infinite
| #
| #
|??
|
|
|
|Finds whether a value is infinite
|-
|is_nan
| #
| #
|??
|
|
|
|Finds whether a value is not a number
|-
|log10
| #
| #
|new
|
|
|
|Base-10 logarithm
|-
|log1p
| #
| #
|new
|
|
|
|Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
|-
|log
| #
| #
| #
| #
|
|
|
|-
|Natural logarithm (''ln'')
| #
| #
| #
| #
|
|
|
|-
|max
| #
| #
| #
| #
|
|
|Find highest value
|-
|min
| #
| #
| #
| #
|
|
|Find lowest value
|-
|octdec
| #
| #
|new
|
|
|
|Octal to decimal
|-
|pi()
| #
| #
| #
| #
|
|
|Get value of pi - the function does not take an argument, like in Excel.
|-
|pow (numberToRaise, NumberRaisedTo)
| #
| #
|new 
|
|
|
|
|-
|power (numberToRaise, NumberRaisedTo)
|
| # 
|new
|
|
|
|Exponential expression
|-
|rad2deg
| #
| #
|
|
|
|
|Converts the radian number to the equivalent number in degrees
|-
|rand
| #
| #
|new
|
|
|
|Generate a random integer
|-
|-
|rand_int
|
|
| #
|
|
|
|Generate a random integer
|-
|-
|rand_float
|
|
| #
|
|
|
|Generate a random float
|-
|round
| #
| #
| #
| #
|
|
|Rounds a float
|-
|sin
| #
| #
| #
| #
|
|
|Sine -- in radians!!!  Convert your degree measurement to radians before you take the sin of it.
|-
|sinh
| #
| #
| #
| #
|
|
|Hyperbolic sine -- in radians!!!  Convert your degree measurement to radians before you take the sinh of it.
|-
|sqrt
| #
| #
| #
| #
|
|
|Square root
|-
|tan
| #
| #
| #
| #
|
|
|Tangent -- in radians!!!  Convert your degree measurement to radians before you take the tan of it.
|-
|tanh
| #
| #
| #
| #
|
|
|Hyperbolic tangent -- in radians!!!  Convert your degree measurement to radians before you take the tanh of it.
|}
to be completed --[[User:Pierre Pichet|Pierre Pichet]] ([[User talk:Pierre Pichet|talk]]) 12:12, 12 December 2014 (AWST)