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+//newton's general interpolation formula

+//example 3.22

+//page 114

+clc;clear;close;

+x=[300 304 305 307];

+y=[2.4771 2.4829 2.4843 2.4871];

+for i=1:3

+    d1(i)=(y(i+1)-y(i))/(x(i+1)-x(i));

+end

+for i=1:2

+    d2(i)=(d1(i+1)-d1(i))/(x(i+2)-x(i));

+end

+x0=301;

+log301=y(1)+(x0-x(1))*d1(1)+(x0-x(2))*d2(1);

+printf(' valure of log(%d) is :%0.4f',x0,log301);