getmax: getmax generates the upper bound for a plot
Description
getmax generates an upper bound for a plot where it
is unknown whether the maximum is greater than zero of not.
If > 0 then multiplying by the default mult of 1.05 works well
but if the outcome if < 0 then the multiplier needs to be
adjusted appropriately so the maximum is slightly higher than
the maximum of the data
Usage
getmax(x, mult = 1.05)
Arguments
x
the vector of data to be tested for its maximum
mult
the multiplier for both ends, defaults to 1.05 (=0.95 if < 0)