getmin: getmin can be used to define the lower bound for a plot
Description
getmin generates a lower bound for a plot where it is unknown
whether the minumum is less than zero of not. If less than 0 then
multiplying by the default mult of 1.05 works well but if the outcome if
> 0 then the multiplier is adjusted appropriately so that the minimum
is slightly lower than the minimum of the data
Usage
getmin(x, mult = 1.05)
Arguments
x
the vector of data to be tested for its minimum
mult
the multiplier for both ends, defaults to 1.05 (=0.95 if >0)