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专业: 控制理论与方法

【答案】应助回帖

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孙雯雯: 金币+3, ★有帮助 2014-10-30 15:36:30

这个题可以左右两边乘以sin()的平方，然后左边是一个平方，左右开平方，得到的函数应该是表示两条直线，不会是椭圆呀……

figure(1)
subplot(2,3,1)
ezplot('x^2/(5*5)-2*cos(45*0)*x*y/(5*5)+cos(45*0)*cos(45*0)*y^2/(5*5)-sin(45*0)*sin(45*0)', [-5 5])
grid
subplot(2,3,2)
ezplot('x^2/(5*5)-2*cos(45)*x*y/(5*5)+cos(45)*cos(45)*y^2/(5*5)-sin(45*1)*sin(45*1)', [-5 5])
grid
subplot(2,3,3)
ezplot('x^2/(5*5)-2*cos(45*2)*x*y/(5*5)+cos(45*2)*cos(45*2)*y^2/(5*5)-sin(45*2)*sin(45*2)', [-5 5])
grid
subplot(2,3,4)
ezplot('x^2/(5*5)-2*cos(45*3)*x*y/(5*5)+cos(45*3)*cos(45*3)*y^2/(5*5)-sin(45*3)*sin(45*3)', [-5 5])
grid
subplot(2,3,5)
ezplot('x^2/(5*5)-2*cos(45*4)*x*y/(5*5)+cos(45*4)*cos(45*4)*y^2/(5*5)-sin(45*4)*sin(45*4)', [-5 5])
grid

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