number of parameters to simulate between the minimum
and maximum parameter values.
.factor
a numeric vector used to divide and multiply the
parameter value thus generating the minimum and maximum parameter values,
respectively, for the sequence; if .factor is length 1 it will be
recycled to length 2; the first value is used to divide the nominal
value generating the minimum value; the second value is used to multiply
the nominal value generating the maximum value.
.geo
if TRUE a geometric sequence is generated (evenly
spaced from min to max on log scale); otherwise, the sequence is
evenly spaced on Cartesian scale.
.digits
if numeric, the number of significant digits in the
parameter sensitivity values are set using base::signif().