作业帮matlab画响应曲线出错,请大侠们帮忙,程序如下：syms f g k m jsyms s ta=g/(j*s^3+m*s^2+k*s);b=ilaplace(a);j=0.003242;m=0.044;k=769;g=k*pi/9-m;b=1/k*(1-exp(-1/2*t/j*m)*cosh(1/2*t/j*(m^2-4*j*k)^(1/2))-exp(-1/2*t/j*m)*m/(m^2-4*j*k)^(1/2)*s
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matlab画响应曲线出错,请大侠们帮忙,程序如下：syms f g k m jsyms s ta=g/(j*s^3+m*s^2+k*s);b=ilaplace(a);j=0.003242;m=0.044;k=769;g=k*pi/9-m;b=1/k*(1-exp(-1/2*t/j*m)*cosh(1/2*t/j*(m^2-4*j*k)^(1/2))-exp(-1/2*t/j*m)*m/(m^2-4*j*k)^(1/2)*s
matlab画响应曲线出错,请大侠们帮忙,
程序如下：
syms f g k m j
syms s t
a=g/(j*s^3+m*s^2+k*s);
b=ilaplace(a);
j=0.003242;
m=0.044;
k=769;
g=k*pi/9-m;
b=1/k*(1-exp(-1/2*t/j*m)*cosh(1/2*t/j*(m^2-4*j*k)^(1/2))-exp(-1/2*t/j*m)*m/(m^2-4*j*k)^(1/2)*sinh(1/2*t/j*(m^2-4*j*k)^(1/2)))*g;
t=(0:1:100);
plot(t,b)
报错：
Error using ==> plot
Conversion to double from sym is not possible.
Error in ==> sh2 at 11
plot(t,b)
matlab画响应曲线出错,请大侠们帮忙,程序如下：syms f g k m jsyms s ta=g/(j*s^3+m*s^2+k*s);b=ilaplace(a);j=0.003242;m=0.044;k=769;g=k*pi/9-m;b=1/k*(1-exp(-1/2*t/j*m)*cosh(1/2*t/j*(m^2-4*j*k)^(1/2))-exp(-1/2*t/j*m)*m/(m^2-4*j*k)^(1/2)*s
syms f g k m j
syms s t
a=g/(j*s^3+m*s^2+k*s);
b=ilaplace(a);
j=0.003242;
m=0.044;
k=769;
g=k*pi/9-m;
b=1/k*(1-exp(-1/2*t/j*m)*cosh(1/2*t/j*(m^2-4*j*k)^(1/2))-exp(-1/2*t/j*m)*m/(m^2-4*j*k)^(1/2)*sinh(1/2*t/j*(m^2-4*j*k)^(1/2)))*g;
t=(0:1:100);
b=eval(b)
figure
plot(t,b)
看看你少了哪一句?
还有一个问题就是你的b是一个虚数,所以画出来的图有问题!
祝你学习愉快!