On 9/24/16 8:29 AM, Christian Franke wrote:
> - Method-2 could be significantly speed up if the order of the array
> accesses is reversed:
>
> for (( i=0; i<N-1; i++)); do
> if (( -(Pi[i] - Pi[i+1]) < min )); then
> min=$((-(Pi[i]-Pi[i+1])))
> fi
> done
>
> Result: ~3 seconds
> (using 'let' in the 'min' assignment failed with syntax error - Bug?)
I assume you mean that you used something like
let min=-(Pi[i]-Pi[i+1])
That's a syntax error because `(' is a shell operator, and it needs to be
quoted if you want it to appear in a word. Since `let' is a builtin, not
part of the shell syntax, you have to make sure that all arguments to it
are valid shell words.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/
