作业帮matlab画响应曲线出错,
来源：学生作业帮 编辑：作业帮 分类：综合作业 时间：2024/07/02 19:40:43
matlab画响应曲线出错,
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)
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)
plot(t,subs(b))
把符号形b转换成double形
把符号形b转换成double形