Lagrange Interpolation: Difference between revisions
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Line 21:
-21 + 215/6*x - 16*x^2 + 13/6*x^3
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=={{header|J}}==
From the J wiki [[j:Phrases/Polynomials|polynomial phrases]] page, we have a couple implementations:
<syntaxhighlight lang=J>lagrange=: ] +/ .* [ (] % p.~) 1 p.@;~&1\. [
lagrange1=: %.@(^/ i.@#)@[ +/ .* ]</syntaxhighlight>
Task example:
<syntaxhighlight lang=J> 1 2 3 4 lagrange 1 4 1 5
_21 215r6 _16 13r6
1 2 3 4 lagrange1 1 4 1 5
_21 35.8333 _16 2.16667</syntaxhighlight>
(The J representation of a polynomial is the list of coefficients of the polynomial such that the index of the coefficient is the power applied to the polynomial's variable.)
=={{header|Julia}}==
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