How to fix "Error using indexing" while calculating differential equations?

syms y(t)
ode = diff(y,t) == t*y

ode(t) = 

ySol(t) = dsolve(ode)

ySol(t) = 

I copied this example straight from the MatLAB "Solve differential equations" > "First-Order Linear ODE" -example and hoped to modify it to solve my own equation, but it gives me an error message of "Error using indexing: Invalid argument at position 2. Symbolic function expected 1 input arguments but received 2.". I have no clue how to fix it, so help would be kindly appreciated.

[Torsten]

As you can see above, the example works with MATLAB R2024a. What's your MATLAB version ?

[Iita]

Ah, I've got the R2023a version. I imagine an update would fix things quite efficiently :,D

[Torsten]

I don't see any changes made in "dsolve" from R2023a to R2024a, but you can try.

Do you get the same error with this code ? Or does the error happen later on in your code when you try to manipulate ySol ?

syms y(t)
ode = diff(y,t) == t*y;
ySol = dsolve(ode)

ySol = 

Answer 1

[John D'Errico]

The code you show will work perfectly in MATLAB, in literally any recent release of MATLAB. R2023 is entirely recent.

However, it is very possible that you have defined a variable named diff in your workspace. For example, let me do this:

syms y(t)

diff(t) = y(t)

diff(t) = 

ode = diff(y,t) == t*y

Error using indexing (line 249)
Invalid argument at position 2. Symbolic function expected 1 input arguments but received 2.

Do you see that I have gotten exactly the same error you were given?

Do this at the command line:

whos diff -all

And then delete the variable named diff.