[Scilab-users] display of complex/not real numbers, again

[Samuel Gougeon]

Le 12/09/2019 à 18:55, Stéphane Mottelet a écrit :
> 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 to this 
> display mixing "v" and "e" mode...


... and IMO it's very suitable. The only rule should be that, */for a 
given format's width/*, */the more the number of significant displayed 
figures the better./* When the exponent format is used, it takes 4 or 5 
digits (D+12, D+123). As a consequence, in v mode, small (absolute) 
values should be displayed in normal mode down to 4 non-significant 0 
(e.g. 0.000012), and switched to "e" mode beyond.

In v mode, forcing the display of 0.0123456  in "e" mode on the (bad) 
reason that some other huge or tiny numbers in the matrix are displayed 
in this mode, would print 1.234D-02, and so make invisible 2 significant 
figures.
I do not see any reason that would impose the display mode to be 
homogeneous over all elements of a matrix, possibly canceling the 
display of significant figures in the given format's width.

Regards

Samuel


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