FNX – Evaluation of single-variable function

Block SymbolLicensing group: STANDARD

Function Description
The FNX block evaluates basic math functions of single variable. The table below shows the list of supported functions with corresponding constraints. The ifn parameter determines the active function.
List of functions:


ifn: shortcut	function	constraints on u

1: acos	arccosine	$u \in < - 1.0, 1.0 >$
2: asin	arcsine	$u \in < - 1.0, 1.0 >$
3: atan	arctangent	–
4: ceil	rounding towards the nearest higher integer	–
5: cos	cosine	–
6: cosh	hyperbolic cosine	–
7: exp	exponential function $e^{u}$	–
8: exp10	exponential function $1 0^{u}$	–
9: fabs	absolute value	–
10: floor	rounding towards the nearest lower integer	–
11: log	logarithm	$u > 0$
12: log10	decimal logarithm	$u > 0$
13: random	arbitrary number $z \in < 0, 1 >$ (u independent)	–
14: sin	sine	–
15: sinh	hyperbolic sine	–
16: sqr	square function	–
17: sqrt	square root	$u > 0$
18: srand	changes the seed for the random function to u	$u \in ℕ$
19: tan	tangent	–
20: tanh	hyperbolic tangent	–

Note: All trigonometric functions process data in radians.

The error output is activated ( $E = on$ ) in the case when the input value u falls out of its bounds or an error occurs during evaluation of the selected function (implementation dependent), e.g. square root of negative number. The output is set to substitute value in such case ( $y = yerr$ ).

Input

u	Analog input of the block	Double (F64)

Outputs

y	Result of the selected function	Double (F64)
E	Error flag	Bool

Parameters

ifn	Function type (see table above) $⊙$ 1	Long (I32)
yerr	Substitute value for an error case	Double (F64)

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