I have a Dat file generated from XCODE with C

I want to graph with Dat file in C but don't know how

I'm not very familiar with c or xcode so need help

I made an main.c and put code to solve

calculates the value of Px0x1xn(x) for each x by working itself through the matrix from left to right,

starting from the support points, using the recursion formula for Nevilles algorithm

The code then prints x, f (x), Px0 x1 xn (x), and Px0 x1 xn (x) f (x) to a Dat file

Need to graph to see the different but don't know how