not enough input arguments when using function functions.

Hi, when I call heun(u0,n,dt,f), the error is:

Not enough input arguments.

Error in f (line 7)

mat = zeros(n);

Any ideas why? It's like the f function hasn't even read the parameters I put into it.

Thanks.

[Stephen23]

Please show the exact code used to define the inputs u0, n, dt, and f, and exactly how you call heun. Do not edit anything to make it simpler for us, we need the exact code.

Most likely you called the function instead of defining a function handle:

https://www.mathworks.com/help/matlab/matlab_prog/creating-a-function-handle.html

[Arthur]

Hi, that was exactly the issue. Thanks!

Answer 1

[Ganesh]

Hi @Arthur,

The error is occuring as you are likely not passing "f" as a "function handle".

You can try calling "heun(u0,n,dt,@f)" instead.

When passing functions as arguments to another function, it is important to pass it as a function handle always. You can find more on "function handles" from the following documentation:

https://www.mathworks.com/help/matlab/matlab_prog/creating-a-function-handle.html

Edit - I just saw @Stephen23 has already answered it in comments, apologies for a repetitive answer.

[Arthur]

that was exactly the issue. Thanks!

[Ganesh]

Kindly accept the answer if your query is resolved!