Function instead of polyval

2012 8 7
2 个回答
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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.

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Sean de Wolski
Sean de Wolski 2012-8-7

1 个投票

fnotpolyval = @(p,x)sum(bsxfun(@(x,p)p*x.^(numel(p):-1:1),p',x))
or
fnotpolyval = @(p,x)sum(x'*p,2)'

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-8-7
编辑：Azzi Abdelmalek 2012-8-7

1 个投票

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

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Yash
Yash 2012-8-7
can this be like having the same syntax has the polyval as in the same way i call polyval, over here i have to define the function f in terms of x and then evaluate, i need the syntax in terms of polyval.
Azzi Abdelmalek
Azzi Abdelmalek 2012-8-7
ok try this
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
Yash
Yash 2012-8-7
giving error
??? Index exceeds matrix dimensions.
Error in ==> @(p,x)sum((x.^[length(p)-1:-1:0].*p))
Yash
Yash 2012-8-7
thanks but i got it done :)

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