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The function F(x) is a polynomial of degree 3.
And given the values of x and y = F(x) mod 251
it is required to reconstruct the polynomial F(x)
x is finite and has only 3 discrete values
how could we solve this using lagrange interpolation

hi
if i have used modulo function in the polynomial then how can i use lagrange interpolation
Posted 31-Dec-12 2:20am
Edited 31-Dec-12 21:02pm
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## Solution 1

Start from here and it should help you out: Matlab - Lagrange Interpolation Polynomial[^]
General info about the same: Wiki Lagrange polynomial[^]

Try out!
hi if i have used modulo function in the polynomial then how can i use lagrange interpolation
terasajan - 2-Jan-13 3:09am

Did you go through the MATLAB mathwork's link?
Sandeep Mewara - 2-Jan-13 4:08am

thank u sir yes i did went through the links
terasajan - 3-Jan-13 4:17am

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## Solution 2

hi
if i have used modulo function in the polynomial then how lagrange interpolation function can be used
Do not post questions as Solutions. If you have question to ask someone who has replied then use the "Have a Question or Comment" link below their answer.
Richard MacCutchan - 1-Jan-13 5:23am