next
|
previous
|
forward
|
backward
| up |
top
|
index
|
toc
|
home
number -- count how many elements of a list satisfy a condition
Description
number(x,f)
the number of elements
e
of the list
x
for which
f(e)
is true.
See also
positions
-- which elements of a list satisfy a condition
select
-- select from a list, hash table, or string