Unrecognized function or variable 'dudx'.

Hello everyone.

I used to work with built-in function 'dudx' a couple of times, but yesterday when i started to work with it again ,i get an error for no reason and the error is : Unrecognized function or variable 'dudx'.

i tryed to clear all variables ,literally everything from workspace,functions and my files . but still it's not working.

thanks for any help :)

[Torsten]

I don't know of a built-in function "dudx".

Can you give a link ?

[Star Strider]

The only reference I can find for ‘dudx’ (that is a variable and not a function) is in the output of the pdeval function.

[Amir Hossein Ghezelbash]

Ow

that's my bad .

i thought 'dudx' is a built-in function. bcz i saw that as an input in 'pdepe' documantation .I'm still not sure...

but anyway thanks for help

[Amir Hossein Ghezelbash]

Solve System of PDEs

check this documantation

there you see they've used 'dudx'

[Torsten]

Yes, but I think it's only a variable name, not a function.

[Jon]

Yes it is just a local variable name in their example, not a function.

Answer 1

[Jon]

As far as I can tell, unless it is in a toolbox that I don't have there is no built in MATLAB function called dudx.

If you think you have a function that you or someone in your group has written with this name then you need to find out where the m file dudx.m is stored on your harddrive and use MATLAB's path function to set the path to that folder (or run in that folder).

[Amir Hossein Ghezelbash]

Hello and thanks for your responce...

if You check on 'pdepe' documantation( MATLAB help) you will see 'dudx' as an input.

And i aslo checked 'dudx' in help of MATLAB and yes its a function you can call it with two input arguments

dudx(x1,x2)...

But IDK why it's not working for me