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// Example 5.26
// caption: 1) composite trapizoidal rule, 2) composite simpsons rule with 2,4 ,8 equal sub-intervals,
// I=integral 1/(1+x) in the range [0,1]
deff('[y]=f(x)','y=1/(1+x)')
// when N=2;
// 1)composite trapizoidal rule
h=1/2;
x=0:h:1;
IT=comptrapezoidal(x,h,f)
// 2)composite simpsons rule
[I] = simpson13(x,h,f)
// when N=4
// 1)composite trapizoidal rule
h=1/4;
x=0:h:1;
IT=comptrapezoidal(x,h,f)
// 2)composite simpsons rule
[I] = simpson13(x,h,f)
// when N=8
// 1)composite trapizoidal rule
h=1/8;
x=0:h:1;
IT=comptrapezoidal(x,h,f)
// 2)composite simpsons rule
[I] = simpson13(x,h,f)
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