solutions-ch9-jasik.txt

Problem 11
Description
f = @(x)(2.+(x-1.45).^2)./(3+3.5.*(0.8.*x.^2-0.6.*x+2));
x1 = fminbnd(f,-9^9,9^9);
g = @(x)(-1).*f(x);
x2 = fminbnd(g,-9^9,9^9);
a = linspace(-3,3);
b = f(a);
plot(x1,f(x1),'--o',x2,f(x2),'--o',a,b)


Problem 18
Description
A = integral(@(x)(1.+0.5.*x.^3-x.^2).^(1/4),0,3)
B = integral(@(x)(x.*cosd(x)+2.*x.^2)./exp(x),0,8)

Problem 20
Description
x = [ 0, 0.4, 0.8, 1.2, 1.6, 2.0, 2.4, 2.8 ];
F = [ 0, 0.85, 1.30, 1.60, 1.87, 2.14, 2.34, 2.52 ];
W = trapz(x./12,F)

Problem 34
Description
ode45(@(x,y)(-x^2 + (exp(-y).*x.^3)/4),[1 5],1)