 # Acos ( number )

Returns the arc cosine of a given number.     Average rating: 4.2 (29 votes) Log in to vote Brian Dunning - Show more from this author BrianDunning.com https://www.briandunning.com
Sample input:
Acos ( .4 )
Sample output:
66.42182152

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Returns the arc cosine, or inverse cosine, of a given number. This operates in radians, just like FileMaker's other trigonometric functions. For the input to be a valid cosine, it should be in the range of -1 to 1.

Additional thanks to Corn Walker and Jason DeLooze. Klaus, BerlinSep 8, 2011 /*------------------------------------------------------- Function Name: IsValidBankNumber Checks a Dutch banknumber for validity. Syntax: IsValidBankNumber ( banknummer ) Returns "true" if banknummer passes the '11-proef', "false" if not or an empty string if banknummer is empty. Author - Theo Ros ----------------------------------------------------------*/ If ( IsEmpty ( banknummer ) ; "" ; Let ( sNumber = Filter ( banknummer ; "0123456789" ) ; If ( sNumber = "123456789" or Length ( sNumber ) > 9 ; "false" ; Let ( nNumber = Right( "000000000" & sNumber ; 9 ) ; If ( Mod( GetAsNumber ( Left ( nNumber ; 1 ) ) * 9 + GetAsNumber ( Middle ( nNumber ; 2 ; 1 ) ) * 8 + GetAsNumber ( Middle ( nNumber ; 3 ; 1 ) ) * 7 + GetAsNumber ( Middle ( nNumber ; 4 ; 1 ) ) * 6 + GetAsNumber ( Middle ( nNumber ; 5 ; 1 ) ) * 5 + GetAsNumber ( Middle ( nNumber ; 6 ; 1 ) ) * 4 + GetAsNumber ( Middle ( nNumber ; 7 ; 1 ) ) * 3 + GetAsNumber ( Middle ( nNumber ; 8 ; 1 ) ) * 2 + GetAsNumber ( Right ( nNumber ; 1 ) ) ; 11 ) = 0 ; "true" ; "false" ) ) ) ) )