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;

Accepted Answer

Star Strider
Star Strider on 10 Dec 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 Comments
Star Strider
Star Strider on 11 Dec 2020
As always, my pleasure!
Thank you! Maybe some day ...

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More Answers (1)

Steven Lord
Steven Lord on 10 Dec 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 Comments
Opariuc Andrei
Opariuc Andrei on 11 Dec 2020
i removed and all my ode45 work fine . thx :)

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