Lagrange interpolation-question on the logic
조회 수: 2 (최근 30일)
이전 댓글 표시
The following code for calculating the Lagrange interpolation is working, but I have a question: why have we placed the sum after the j-counter not before it ends? wouldn't the fx for the same i and different j overwrite?
Here is the code-I hope it's readable now-:
% function calculated_value = Lagrange (x,y,xx)
n = length(x); % Total number of values in x matrix
sum=0; % Initial summation gues
for i=1:n
fx=y(i); % Putting ith value as function value
for j=1:n
if i ~= j
fx= fx*(xx-x(j))/(x(i)-x(j)) % Calculating the products
end
% end
sum =sum+fx; % Adding fx values
end
calculated_value = sum;
댓글 수: 0
답변 (1개)
Torsten
2015년 5월 21일
First you must build the complete product, then you can add.
Best wishes
Torsten.
댓글 수: 0
참고 항목
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!