ode45 too many input arguments
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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;
采纳的回答
Star Strider
2020-12-10
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 个评论
Opariuc Andrei
2020-12-10
i still get the too many input error , i tried running with and without @ ,same error
Star Strider
2020-12-10
The problem is that you have your own ‘ode45’ function (or script, although if it is a script, that would likely throw a different error) that is overshadowing the MATLAB ode45 function.
The solution is to rename yours to something that does not overshadow any MATLAB function.
I must leave that to you.
Opariuc Andrei
2020-12-10
编辑：Opariuc Andrei
2020-12-11
Star Strider
2020-12-11
As always, my pleasure!
Thank you! Maybe some day ...
更多回答（1 个）
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
3 个评论
Opariuc Andrei
2020-12-10
Steven Lord
2020-12-11
Rename or remove D:\Matlab saves\ode45.m.
Opariuc Andrei
2020-12-11
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