This summary list of intrinsic functions is useful as a quick reference. The function syntax specification has formal syntactic definitions for intrinsic functions.

Common Numeric Functions

abs(numeric)                 Absolute value
ln(numeric)                  Natural log
log(numeric)                 Log base 10
log2(numeric)                Log base 2
max(numeric, numeric)        Maximum value of two signed arguments
min(numeric, numeric)        Minimum value of two signed arguments
mod(numeric, numeric)        Modulus of two signed arguments
remainder(numeric, numeric)  Division remainder two signed arguments
root(numeric)                Square root; integers are unsigned; reals are signed

Real Number Functions

[a]cos[h](real)              Cosign functions
[a]sin[h](real)              Sine functions
[a]tan[h](real)              Tangent functions
atan(realA, realB)           Inverse tangent of realA / realB
exp(real)                    Raise e to the power of the argument
ceiling(real)                Round to the next higher integer
floor(real)                  Round to the next lower integer
integer(real)                Truncated integer part
round(real)                  Round to the nearest integer

Unsigned Integer Functions

borrow(integer, integer)     1 if a borrow from the arguments
carry(integer, integer)      1 if sum of arguments carry
positive(integer)            zero extend the argument

String Manipulation Functions

chop(String [, Word])        Erase from the front of a String
left(String [, Word])        Substring from the front of a String
length(String)               Length of a String
lower(String [, Word])       Lower case a String or character
right(String [, Word])       Substring from the end of a String
string(String [, Word])      Cast integer or extract character
string(String, Word, Word)   Substring of a String
trim(String [, Word])        Erase from the end of a String
upper(String [, Word])       Upper case a String or character

Type Attribute and Cast Functions

@parcel(Integer)             Used to set a pointer to a Parcel expression
@cast(Pointer)               Cast a pointer to the outer type
alignment(Type)              Type alignment in bytes
alignment(@)                 Alignment of a pointer
span(Type)                   Width in bytes of a type
span(@)                      Width of a pointer
context(Variable)            State of a context variable
signal(Variable)             ???

Enumeration(*)               Maximum position in an enumerated type.
Enumeration(.Name)           Position of the, .Name, item.
Enumeration(Integer)         Position given as an integer constant.
Enumeration(Expression)      Position given as a Word expression.

byte(Expression)             Cast to a Byte
parcel(Expression)           Cast to a Parcel
parcel(@Pointer)             Value if the pointer is a parcel
word(Expression)             Cast to a Word
cell(Expression)             Cast to a Cell
single(Expression)           Cast to a Single
double(Expression)           Cast to a Double
string(Expression)           Cast to a String

Form Functions

form( String,      String_Format )
form( Integer,     Integer_Format )
form( Real,        Real_Format )
form( Enumeration, Enumeration_Format )
form( Structure,   Structure_Format )