Advanced Search

Question: Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

Question:Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

Acik6163 10 Maple 2018
ode dsolve numeric odeplot differential-equations
September 19 2019
2


 

> 

restart
> 

with(plots):
> 

Eq := diff(f(eta), `$`(eta, 3))+(diff(f(eta), `$`(eta, 2)))*f(eta)-(diff(f(eta), eta))^2-Typesetting:-delayDotProduct(M, diff(f(eta), `$`(eta, 1)))-Typesetting:-delayDotProduct(A, diff(f(eta), `$`(eta, 1))+Typesetting:-delayDotProduct(Typesetting:-delayDotProduct(1/2, eta), diff(f(eta), `$`(eta, 2)))) = 0;

diff(diff(diff(f(eta), eta), eta), eta)+(diff(diff(f(eta), eta), eta))*f(eta)-(diff(f(eta), eta))^2-M.(diff(f(eta), eta))-A.(diff(f(eta), eta)+(1/2)*(eta.(diff(diff(f(eta), eta), eta)))) = 0

 (1)
> 

M := 1;

1

 (2)
> 

A := 0;

0

 (3)
> 

bcs := f(0) = 0, (D(f))(0) = 1

f(0) = 0, (D(f))(0) = 1

 (4)
> 

dsys := {Eq, bcs};

{diff(diff(diff(f(eta), eta), eta), eta)+(diff(diff(f(eta), eta), eta))*f(eta)-(diff(f(eta), eta))^2-(diff(f(eta), eta)) = 0, f(0) = 0, (D(f))(0) = 1}

 (5)
> 

dsol := dsolve(dsys, numeric);

Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

  

Error, (in plots/odeplot) input is not a valid dsolve/numeric solution

  


 

Download error.mw
 

> 

restart
> 

with(plots):
> 

Eq := diff(f(eta), `$`(eta, 3))+(diff(f(eta), `$`(eta, 2)))*f(eta)-(diff(f(eta), eta))^2-Typesetting:-delayDotProduct(M, diff(f(eta), `$`(eta, 1)))-Typesetting:-delayDotProduct(A, diff(f(eta), `$`(eta, 1))+Typesetting:-delayDotProduct(Typesetting:-delayDotProduct(1/2, eta), diff(f(eta), `$`(eta, 2)))) = 0;

diff(diff(diff(f(eta), eta), eta), eta)+(diff(diff(f(eta), eta), eta))*f(eta)-(diff(f(eta), eta))^2-M.(diff(f(eta), eta))-A.(diff(f(eta), eta)+(1/2)*(eta.(diff(diff(f(eta), eta), eta)))) = 0

 (1)
> 

M := 1;

1

 (2)
> 

A := 0;

0

 (3)
> 

bcs := f(0) = 0, (D(f))(0) = 1

f(0) = 0, (D(f))(0) = 1

 (4)
> 

dsys := {Eq, bcs};

{diff(diff(diff(f(eta), eta), eta), eta)+(diff(diff(f(eta), eta), eta))*f(eta)-(diff(f(eta), eta))^2-(diff(f(eta), eta)) = 0, f(0) = 0, (D(f))(0) = 1}

 (5)
> 

dsol := dsolve(dsys, numeric);

Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

  

Error, (in plots/odeplot) input is not a valid dsolve/numeric solution

  
> 

dsol := dsolve(dsys, numeric)

Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

  

{diff(diff(diff(f(eta), eta), eta), eta)+(diff(diff(f(eta), eta), eta))*f(eta)-(diff(f(eta), eta))^2-(diff(f(eta), eta)) = 0, f(0) = 0, (D(f))(0) = 1}

 (6)
> 

dsol := dsolve(dsys, numeric);

Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

  

Error, (in plots/odeplot) input is not a valid dsolve/numeric solution

  
> 

dsol := dsolve(dsys); plots*odeplot(dsol, [eta, f(eta)], 0 .. 1, color = red, axes = box)

"dsol:="

  

Error, (in plots/odeplot) input is not a valid dsolve/numeric solution

  
> 

dsol := dsolve(dsys, numeric)

Error, (in dsolve/numeric/SC/IVPsetup) initial conditions must be numeric

  
> 

dsol := dsolve(dsys)

"dsol:="

 (7)
> 

``


 

Download error.mw

 
Please Wait...