floor — rounds a real number down to its integer value.
floor (number)
Any number. Non-numbers are treated as zero.
The largest integer which is less than or equal to the number.
Gamma> floor(1.2); 1 Gamma> floor(1.9); 1 Gamma> floor(-1.2); -2 Gamma> floor(-1.9); -2 Gamma>
ceil, round
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