<s>
In	O
mathematics	O
,	O
a	O
nonrecursive	B-Algorithm
filter	I-Algorithm
only	O
uses	O
input	O
values	O
like	O
x[ n	O
−	O
1 ]	O
,	O
unlike	O
recursive	O
filter	O
where	O
it	O
uses	O
previous	O
output	O
values	O
like	O
y[ n	O
−	O
1 ]	O
.	O
</s>
