ode45 too many input arguments

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;

Answer 1

[Star Strider]

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

.

[Opariuc Andrei]

i still get the too many input error , i tried running with and without @ ,same error

[Star Strider]

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]

thx ,you saved me .I wanna buy you a beer :)

[Star Strider]

As always, my pleasure!

Thank you! Maybe some day ...

Answer 2

[Steven Lord]

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

[Opariuc Andrei]

[Steven Lord]

Rename or remove D:\Matlab saves\ode45.m.

[Opariuc Andrei]

i removed and all my ode45 work fine . thx :)