매트랩과제

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과제.

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본문내용

%1
n=1:10;
x=0.5.^n;
fx=9*((x+27).^(1/3)-3)./x;
A=[x; fx;]`;
disp(` x fx`);
disp(A)
%3
plot(x,fx)
xlabel(`x`)
ylabel(`fx`)
grid on
title(`0근방에서 fx=9*((x+27).^(1/3)-3)./x 그래프`)
%4
syms x
limit(fx,x,0)

syms x
diff(tan(5*x))
ans =
5+5*tan(5*x)^2
6번
h=0.01;
x=-pi/2:h:3*pi/2;
fx=cos(x);
plot(x,fx,`--r`)
grid on
hold on
x0=pi/2;
fprimeX0=(cos(x0+h)-cos(x0))/h;
a=fprimeX0;
y0=cos(x0);
tanline=@(x)(a*x+y0);
ytan=tanline(x);
plot(x,ytan,`r`)
axis([-pi/2 3*pi/2 -1.5 1.5])
t=-pi/2:.3:3*pi/2;
er=abs(tanline(t)-cos(t));
errorbar(t,cos(t),er)
7번
1.
2.
%1
ezplot(`cos(x)/(x^4-3*x^2+4)`)
%2
h=0.001;
x=-4:h:4;
fx=cos(x)./(x.^4-3*x.^2+4);
fprime=diff(fx)/h;
plot(x(1:end-1),fprime)
xlabel(`x`)
ylabel(`y`)
grid on
title(`fprime의 그래프`)
%3
fx=@(x)(cos(x)/(x^4-3*x^2+4));
[x1 fval1]=fminbnd(fx,0,3)
fxmin=@(x)-(cos(x)/(x^4-3*x^2+4));
[x2 fval2]=fminbnd(fxmin,0,3)
x1 = 1.94427848913611
fval1 = -0.*************0
x2 =0.*************8
fval2 =-0.*************5

참고 자료

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