劉衛(wèi)國全套配套課件MATLAB程序設(shè)計(jì)與應(yīng)用第3版第5章 MATLAB繪圖-習(xí)題答案

未知驅(qū)動(dòng)探索，專注成就專業(yè)劉衛(wèi)國全套配套課件MATLAB程序設(shè)計(jì)與應(yīng)用第3版第5章MATLAB繪圖_習(xí)題答案1.習(xí)題1題目：使用MATLAB繪制函數(shù)f(x)=x^2-2x+3在區(qū)間[-5,5]上的圖像，并增加相應(yīng)的標(biāo)注。解答：x=-5:0.1:5;

y=x.^2-2*x+3;

plot(x,y);

title('Graphoff(x)=x^2-2x+3');

xlabel('x');

ylabel('y');

gridon;2.習(xí)題2題目：使用MATLAB繪制函數(shù)f(x)=sin(x)和g(x)=cos(x)的圖像，并在圖中繪制函數(shù)之間的交點(diǎn)。解答：x=-pi:0.1:pi;

y1=sin(x);

y2=cos(x);

plot(x,y1,x,y2);

holdon;

plot(x(find(y1==y2)),y1(find(y1==y2)),'ro');

title('Graphoff(x)=sin(x)andg(x)=cos(x)');

xlabel('x');

ylabel('y');

legend('f(x)=sin(x)','g(x)=cos(x)','Intersection');

gridon;3.習(xí)題3題目：使用MATLAB繪制函數(shù)f(x)=exp(x)和g(x)=log(x)的圖像，并確定它們的交點(diǎn)。解答：x=0.1:0.1:5;

y1=exp(x);

y2=log(x);

plot(x,y1,x,y2);

holdon;

plot(x(find(y1==y2)),y1(find(y1==y2)),'ro');

title('Graphoff(x)=exp(x)andg(x)=log(x)');

xlabel('x');

ylabel('y');

legend('f(x)=exp(x)','g(x)=log(x)','Intersection');

gridon;4.習(xí)題4題目：使用MATLAB繪制函數(shù)f(x)=sqrt(x)和g(x)=x^2的圖像，并確定它們的交點(diǎn)。解答：x=0:0.1:5;

y1=sqrt(x);

y2=x.^2;

plot(x,y1,x,y2);

holdon;

plot(x(find(y1==y2)),y1(find(y1==y2)),'ro');

title('Graphoff(x)=sqrt(x)andg(x)=x^2');

xlabel('x');

ylabel('y');

legend('f(x)=sqrt(x)','g(x)=x^2','Intersection');

gridon;5.習(xí)題5題目：使用MATLAB繪制函數(shù)f(x)=0.5x^3-2x^2+3x-1在區(qū)間[-4,4]上的圖像，并標(biāo)注關(guān)鍵點(diǎn)。解答：x=-4:0.1:4;

y=0.5*x.^3-2*x.^2+3*x-1;

plot(x,y);

holdon;

plot(x(find(y==0)),y(find(y==0)),'ro');

plot(x(find(y==max(y))),max(y),'go');

plot(x(find(y==min(y))),min(y),'bo');

title('Graphoff(x)=0.5x^3-2x^2+3x-1');

xlabel('x');

ylabel('y');

legend('f(x)','ZeroPoint','MaxPoint','MinPoint');

grid