?x⍴2
when
⎕io←0
Index
<<
>>
b←?1e6⍴2
13.1 13.2 time 6.64e¯2 3.76e¯2 space 5000056 1125040
b←?1e6⍴2
then time
+/b
13.1 13.2 +/b 3.42e¯3 1.22e¯4