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The following demonstrate the different rounding operations:
$ ( echo X ; seq -1.25 0.25 1.25 ) \
| datamash --full -H round 1 ceil 1 floor 1 trunc 1 frac 1
X round(X) ceil(X) floor(X) trunc(X) frac(X)
-1.25 -1 -1 -2 -1 -0.25
-1.00 -1 -1 -1 -1 0
-0.75 -1 0 -1 0 -0.75
-0.50 -1 0 -1 0 -0.5
-0.25 0 0 -1 0 -0.25
0.00 0 0 0 0 0
0.25 0 1 0 0 0.25
0.50 1 1 0 0 0.5
0.75 1 1 0 0 0.75
1.00 1 1 1 1 0
1.25 1 2 1 1 0.25