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Function instead of polyval

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Yash
Yash il 7 Ago 2012
Is there a Matlab built in function that can be used instead of a polyval function. Or any few lines can work similarly like the polyval function because i dont want to use the polyval function.

Risposta accettata

Sean
Sean il 7 Ago 2012
fnotpolyval = @(p,x)sum(bsxfun(@(x,p)p*x.^(numel(p):-1:1),p',x))
or
fnotpolyval = @(p,x)sum(x'*p,2)'
  2 Commenti
Sean
Sean il 7 Ago 2012
Assumes row vectors for p and x
Yash
Yash il 7 Ago 2012
thanks :)

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Più risposte (1)

Azzi Abdelmalek
Azzi Abdelmalek il 7 Ago 2012
Modificato: Azzi Abdelmalek il 7 Ago 2012
fval=@(p,x) sum((x.^[length(p)-1:-1:0].*p));
%example
p=[2 4 5 3]; x=2;
result=fval(p,x) % fval is your new function
  4 Commenti
Yash
Yash il 7 Ago 2012
giving error
??? Index exceeds matrix dimensions.
Error in ==> @(p,x)sum((x.^[length(p)-1:-1:0].*p))
Yash
Yash il 7 Ago 2012
thanks but i got it done :)

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