[exp] Fix awk sdev computation

2851e89b · aumgn · b97a98b3 · 2851e89b
Commit 2851e89b authored Sep 25, 2017 by aumgn
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bin/mc-2/exp bin/mc-2/exp +2 -2

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--- a/bin/mc-2/exp
+++ b/bin/mc-2/exp
@@ -228,8 +228,8 @@ run_iterations() {
        printf '.'
    done

-    avg=$(awk '{ sum += $1 } END { if (NR > 0) print sum / NR; else print NaN }'     $exp_dir/*/time)
-    sd=$(awk '{ sum += $1; sum2 += $0^2 } END { print sqrt(sum2 / NR - (sum/NR)^2)}' $exp_dir/*/time)
+    avg=$(awk '{ sum += $1 } END { if (NR > 0) print sum / NR; else print NaN }' $exp_dir/*/time)
+    sd=$(awk '{ sum += $1; sum2 += $0^2 } END { print sqrt(abs(sum2 / NR - (sum/NR)^2)) } function abs(x){return ( x >= 0 ) ? x : -x }' $exp_dir/*/time)
    printf ' | Avg: %6.2f  ~%3.2f\n' $avg $sd
 }