This command scans a list of numeric values for the minimum and maximum values. The range is computed as the maximum minus the minimum. The returned result is a three element list: {minimum maximum range}. If the input list is empty, the result "{} {} {}" is returned. The returned values are always formatted as floating point numbers. The global variable, tcl_precision, discussed under tclvars, sets the precision of the result.
range "2.4 1.8 8.2 4.5" 1.8 8.2 6.4