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Intervals defined by their center : center2interval

center2interval takes as argument a vector V of reals and optionnally a real as second argument (by default V[0]-(V[1]-V[0])/2).
center2interval returns a vector of intervals having the real values of the first argument as centers, where the value of the second argument is the left boundary of the first interval.
Input :
center2interval([3,5,8])
Or (since the default value is 3-(5-3)/2=2) :
center2interval([3,5,8],2)
Output :
[2..4,4..6,6..10]
Input :
center2interval([3,5,8],2.5)
Output :
[2.5..3.5,3.5..6.5,6.5..9.5]



giac documentation written by Renée De Graeve and Bernard Parisse