ezplot is plotting a blank plot
显示 更早的评论
no errors nut plot is blank
syms y(x)
a=2;
b=6;
c=1;
d= 8;
e = 6;
ode = diff(y,x) == (-d*x)/(e*y);
ysol = vpa(dsolve(ode))
ezplot(ysol(1))
hold on
ezplot(ysol(2))
回答（3 个）
Mark Sherstan
2018-12-12
0 个投票
You need to solve for your constant C2 otherwise your function is no longer in terms of just x which is a requirment of ezplot.
2 个评论
Brenda Galabe
2018-12-12
Cris LaPierre
2018-12-12
编辑：Cris LaPierre
2018-12-12
You did not try to plot the solution that contains constant C5 (ysol(4)). Your plots are for
- 0
- 2x
- -2x
Cris LaPierre
2018-12-12
编辑：Cris LaPierre
2018-12-12
You equation has two variables. You need to provide a value for 
for ezplot to be able to plot the functions.
for ezplot to be able to plot the functions.Also, best to heed the warnings in the documentation - use fplot instead of ezplot.
If I use fplot and substitute in a value for C2, your code works.
...
ysol = subs(ysol,'C2',25)
fplot(ysol(1))
hold on
fplot(ysol(2))
Brenda Galabe
2018-12-12
0 个投票
1 个评论
Cris LaPierre
2018-12-12
I didn't realize you were using an older version of MATLAB. The behavior will be different. Use ezplot for now.
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