Le 12/09/2019 à 11:55, Antoine ELIAS a écrit :
Hello Stéphane,
In Scilab 6.0.2 without format("e", 24)
--> h = %eps/128, x0=%pi/4
h =
1.735D-18
x0 =
0.7853982
--> (cos(x0+h)-cos(x0-h))/2/h
ans =
0.
--> cos(x0+%i*h)
ans =
0.7071068
--> imag(cos(x0+%i*h))/h
ans =
Hello all,
The subject has been already discussed a lot but I would like it to be
discussed again because I now have a real rationale to promote a change
in the way complex numbers with small imaginary part are displayed.
I don't know if some of you were aware of the clever technique of
Hello Stéphane,
In Scilab 6.0.2 without format("e", 24)
--> h = %eps/128, x0=%pi/4
h =
1.735D-18
x0 =
0.7853982
--> (cos(x0+h)-cos(x0-h))/2/h
ans =
0.
--> cos(x0+%i*h)
ans =
0.7071068
--> imag(cos(x0+%i*h))/h
ans =
-0.7071068
--> -sin(x0)
ans =
-0.7071068
It
Hello,
> De la part de Stéphane Mottelet
> Envoyé : jeudi 12 septembre 2019 10:26
>
> I now have a real rationale to promote a change in
> the way complex numbers with small imaginary part are displayed.
I agree with you.
I would add another advantage:
the user is not always aware that the
Le 12/09/2019 à 14:19, Dang Ngoc Chan, Christophe a écrit :
Hello,
De la part de Stéphane Mottelet
Envoyé : jeudi 12 septembre 2019 10:26
I now have a real rationale to promote a change in
the way complex numbers with small imaginary part are displayed.
I agree with you.
I would add
I prefer the display after applying
https://codereview.scilab.org/#/c/20981/:
--> x0=%pi/4;h=%eps/2
h =
1.110D-16
--> cos(x0+%i*h)
ans =
0.7071068 - 7.850D-17i
However, we could discuss if the arbitrary switch to "e" mode is
desirable or not, but since Scilab 6.0 we have got used
