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

[Stéphane Mottelet]

Le 13/09/2019 à 13:07, Samuel Gougeon a écrit :
> 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.
>
I agree Samuel.
>
> Regards
>
> Samuel
>
>
>
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-- 
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet

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