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Lagrange Interpolation code error

Asked by Charitha Heshan on 28 Mar 2018
Latest activity Answered by Roger Stafford on 28 Mar 2018
Please tell me whats wrong with this code, it was given by the professor but when i try to use it it gives me errors.
if true
function yi = LagrangeInterp(x,y,xi)
x = [ -0.200 0.000 0.200 0.400 0.600 0.800 1.000]; y = [ 0.5000 1.0000 0.5000 0.2000 0.1000 0.0588 0.0385 ];
n = length (x) ; L = zeros (1,n) ; for i =1:n, L(i) = 1; for j = 1:n, if j ~= i, L(i) = L(i) * (xi - x(j)) / (x(i) - x(j)); end end end
yi = sum(y.*L);
% code
end
*Not enough input values *Error in line 3
I want to find Y values when x= 0.3 & x = 0.9
please give me a correct method to find this .
thank you

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1 Answer

Answer by Roger Stafford on 28 Mar 2018

The message is caused by your not defining or properly entering the value of vector 'xi'.

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