Why do I get the error undefined function?

Hi all,

My code for some reason says that my second function undefined but I can clearly see that it is defined. Please help! Thanks!

-Charles

Answer 1

[Walter Roberson]

Your function github_Network_construction does not call your function github_Distribution_Ana .

Typically, only the first function in a file can be called from outside the file. You should probably move github_Distribution_Ana into its own file.

[Charles sun]

I think you misinterpreted my question. My program has two functions. The first function reads in a text file and outputs two variables. Then, I want to use those two variables in the second function. The following link has two datsets the first of which is what I'm using: https://figshare.com/collections/Inter-urban_interactions_of_mobility_via_cellular_position_tracking_in_the_southeast_Songliao_Basin_Northeast_China/4226183/4

[Walter Roberson]

Read through Function Precedence Order,

https://www.mathworks.com/help/matlab/matlab_prog/function-precedence-order.html

and take special note that

4. Local functions within the current file

only applies when one function is calling another in the same file. If github_Network_construction called github_Distribution_Ana then precedence 4 would apply.

But github_Network_construction does not call github_Distribution_Ana . So when you try to invoke github_Distribution_Ana from outside of twoFunc.m then the rule that would potentially be active would be

10. Functions in the current folder

but that only applies when there is a file with the same name as the function being invoked. Which there is not -- there is a file named twoFunc.m so twoFunc() can be invoked. There is no way to say from outside, "call the github_Distribution_Ana that is inside twoFunc.m" . Only the first function in a file (that is not a class definition) has a public interface: the other functions in the file are private to the first function in the file.

Therefore if you want to invoke github_Distribution_Ana from outside of github_Network_construction then you will need to move the code for github_Distribution_Ana into its own file, github_Distribution_Ana.m