[Scilab-users] Can't understand different answer's on sqrt(x^2+1)

[Modestas Bunokas]

Trying to work with vectors, and getting weird results. Example:

m=[9 16];
sqrt(m^2+1)
ans = 9.0553851    16.03122 

I will get same values if I will use input as vector, or will put values
manually. But if I use negative numbers like:

m=[-10 -3];
sqrt(m^2+1)
ans =10.049876    3.1622777
------------------------------
sqrt(-10^2+1)
ans =  9.9498744i 
sqrt(-2^2+1)
ans = 2.8284271i

Questions would be - why do I getting complex number as a result by
inputting m by hand and different result by giving it as vector? Is scilab
irc channel active for some more arithmetic questions, as I stuck a bit on
such things with scilab, if not maybe exist any other places to look for
real time help? I fully understand that it's all because of lack of my
expierence

p.s. Scilab version 5.4.1, on octave and wolframalpha for sqrt(-2^2+1)
getting 1.73205i.

Regards





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