Context: SCOM metric to measure software class cohesion
Paper: A SENSITIVE METRIC OF CLASS COHESION by Luis Fernández and Rosalía Peña.
The equation in question is on page 86:
$S(m,a) = \frac 12[1 + int(\frac {m-1}a)][mod(\frac {m-1}a) + m -1]$
Where m is the number of methods of a class and a is the number of attributes of the class.
I believe the int() function used here is the Integer Part function. But what is the meaning of the mod() function? I can't find a reference to the modulus function where it takes just one argument therefore I can't say for sure that that's what it means.
By comparing with the line immediately above it in the paper, and assuming the authors didn't make a typo, it must be the fractional part, which is sometimes considered as "modulo 1". I suppose for these authors, the second argument of "mod" can be dropped when it is 1.