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&errout — standard error output
&input — standard input
&output — standard output
chdir — change directory
close — close file
digitcnt — count the number of digits in a file.
flush — flush output
open — open file
read — read line
reads — read string
remove — remove file
rename — rename file
seek — seek to position in file
stop — stop execution
where — produce position in file
write — write line
writes — write string

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

r2 tan(r1)
tan(r1) produces the tangent of r1 radians.
 
Parameters
r1
angle in radians, not π/2
returns
tangent of r1
 
Errors
102 r1 is not real
204 r1 singular point of tangent
 
See Also
  • atan — compute arc tangent