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N^N — compute exponential
expr & expr — evaluate in conjunction
expr \ i — limit generator
expr1 | expr2 — evaluate alternatives
L|||L — concatenate lists
N%N — compute remainder
N+N — compute sum
N/N — compute quotient
N1∗N2 — compute product
N<=N — numerically less than or equal
N<N — numerically less than
N=N — numerically equal
N>=N — numerically greater than or equal
N>N — numerically greater than
N~=N — numerically not equal
N–N — compute difference
R.f — get field of record
s ? expr — scan string
s<<=s — lexically less than or equal
s<<s — lexically less than
s==s — lexically equal
s>>=s — lexically greater than or equal
s>>s — lexically greater than
s||s — concatenate strings
s~==s — lexically not equal
v op:=x — augmented assignment
v:=:v — exchange values
v:=x — assign value
v<–>v — exchange values reversibly
v<–x — assign value reversibly
x++x — compute cset or set union
x===x — value equal
x@C — transmit value to co-expression
x~===x — value not equal
x––x — compute cset or set difference
x∗∗x — cset or set intersection

Index of Function Types:
affects &pos
character sets
co-expressions
control structures
file processing
generators
infix operations
keywords
lists, sets and tables
math
metadata
output formatting
pattern matching
prefix operations
records
strings
windows and keyboards

Index of Subsystems:
base
digitcnt.icn
SNOBOL4 functions
basemath
atan
 
compute arc tangent
 
Description

r3 atan(r1, r2)
atan(r1, r2) produces the arc tangent of r1 / r2 in the range of –π to π with the sign
of r1.
 
Parameters
r1
real, dividend of optional divide, or argument to be converted
r1
real, divisor of optional divide
 
Defaults
r2
1.0
 
Errors
102 r1 or r2 not real
 
See Also
  • tan — compute tangent