what does "Undefined function 'f_integration' for input arguments of type 'double' " mean

Trying to run this script but this error continues to pop up.

a1_1= 0; 
b1_1=10000; 
a2_1=0; 
b2_1=0;
h_1=2;
ele_rotation_1=0;
F_1 = f_integration(h_1,a1_1,b1_1,a2_1,b2_1,ele_rotation_1);
K_1 = K_matrix(A,E,I,h_1,ele_rotation_1);

[Amy Sanchez]

Completed error message:

Undefined function 'f_integration' for input arguments of type 'double'.

Error in Quiz111 (line 14)

F_1 = f_integration(h_1,a1_1,b1_1,a2_1,b2_1,ele_rotation_1);

Answer 1

[KALYAN ACHARJYA]

Because f_integration & K_matrix are not Matlab inbuilt functions, hence you have to defined both function file in the same directory to run the code.

These functions known as user defined functions or customized functions by user. Where you get the idea to use these two functions? Please do search in Matlab Exchange file, may be there.

Answer 2

[Walter Roberson]

It means that MATLAB cannot find a function or variable named f_integration

There is no MATLAB function by that name, and I cannot find a useful function by that name anywhere on the Internet.

[Luisa]

It helps me too. Thank you :)

[Walter Roberson]

Just now, I did find a likely-looking f_integration

https://www.coursehero.com/file/49654786/f-integrationm/

It is part of University of Houston MECE 3381

[Luisa]

Thank you, but your comment in 2019 helped me by your explanation.

I indeed consider other named function and not f_integration.