[Scilab-users] Inconsistency in polynomial coefficient order?

[Stéphane Mottelet]

Hello 

I think this is due to the Matlab convention, as filter syntax is the same in Scilab.

S.

> Le 25 oct. 2019 à 23:25, Federico Miyara <fmiyara at fceia.unr.edu.ar> a écrit :
> 
>  
> Dear all,
> 
> I'm somewhat puzzled by what appears to be an inconsistency in polynomial coefficient order.
> 
> Consider the polynomial
> 
> A = 1 + 2*x + 3*x^2;
> 
> If I want to create it using poly I must write
> 
> A = poly([1 2 3], 'x', 'coeff');
> 
> But if I want to use it as the denominator of a filter (whose numerator we can call B) I must write
> 
> y = filter(B, [3 2 1], x);
> 
> Is there a reason for this?
> 
> Regards,
> 
> Federico Miyara
> 
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