Hi
The function *clean *does that:
clean(cos(%pi)+%i*sin(%pi))
Note that the limited precision of floating point numbers is a general
issue in computer science.
http://en.wikipedia.org/wiki/Floating_point#Representable_numbers.2C_conversion_and_rounding
You should be aware of that for instance when testing numbers, as in:
if cos(%pi)+%i*sin(%pi) == -1
disp("i am a mathematician")
else
disp("i am a computer")
end
if abs(cos(%pi)+%i*sin(%pi) +1)<1d-8
disp("yep")
else
disp("nope")
end
or when you calculate indefinite integrals.
Also note that some modules on ATOMS and scilabfilexchange allow to make
computation with arbitrary (but not infenitesimal) precision.
On 19/02/2014 15:15, Lester Anderson wrote:
Hello,
Just a quick query. Not been using Scilab for a while, so maybe I have
missed something, but is there a built-in precision setting for
working with real and imaginary functions?
Tried the Euler formula (special case) in Scilab 5.4.1:
-->x=cos(%pi)+(%i*sin(%pi))
x =
- 1. + 1.225D-16i
-->y=%e^(%i*%pi)
y =
- 1. + 1.225D-16i
The real part is fine, but the complex has a measured value
(approaching zero). Is there a way to tell Scilab if this gets beyond
a limit to round off at zero say?
Sure this is an easy one!
Cheers
Lester
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Adrien Vogt-Schilb
PhD Student (Cired)
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