ode45 too many input arguments

56 visualizaciones (últimos 30 días)
Opariuc Andrei
Opariuc Andrei el 10 de Dic. de 2020
Comentada: Star Strider el 11 de Dic. de 2020
so i got a function which i did as home work a few days ago tested it ,it ran ,now it doesn't want to run anymore i don't know how to fix it ,because i want to do a few more examples of ode45 and i get same error . The files have not been opened/modified since i wrote/tested them .
the function (which is saved correctly)
function dy=ec1L10(x,y)
dy=4*exp(0.8*x)-0.5*y
and the script
[x y]=ode45('ec1L10',0:0.25:4,2);
plot(x,y);grid on ; axis tight;

Respuesta aceptada

Star Strider
Star Strider el 10 de Dic. de 2020
To use your original construction, the single quotes are no longer acceptable..
Instead:
[x y]=ode45(@ec1L10,0:0.25:4,2);
would work.
However ‘ec1L10’ can be written as an anonymous function:
ec1L10 = @(x,y) 4*exp(0.8*x)-0.5*y;
so the rest of that code becomes:
[x y]=ode45(ec1L10,0:0.25:4,2);
plot(x,y);
grid on
axis tight
.
  4 comentarios
Opariuc Andrei
Opariuc Andrei el 10 de Dic. de 2020
Editada: Opariuc Andrei el 11 de Dic. de 2020
thx ,you saved me .I wanna buy you a beer :)
Star Strider
Star Strider el 11 de Dic. de 2020
As always, my pleasure!
Thank you! Maybe some day ...

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Más respuestas (1)

Steven Lord
Steven Lord el 10 de Dic. de 2020
Let's check if you're using the ode45 function included in MATLAB. What does this function show? It should show just one function inside the toolbox/matlab/funfun subdirectory under matlabroot.
which -all ode45
/MATLAB/toolbox/matlab/funfun/ode45.m
  3 comentarios
Steven Lord
Steven Lord el 11 de Dic. de 2020
Rename or remove D:\Matlab saves\ode45.m.
Opariuc Andrei
Opariuc Andrei el 11 de Dic. de 2020
i removed and all my ode45 work fine . thx :)

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