Undefined function 'generateParamY' for input arguments of type 'char'

I am getting an error for my code, the error shown is-

Undefined function 'generateParamY' for input arguments of type 'char'.

Error in BEProj (line 5)

[y_1_0, y_2_0, y_3_0] = generateParamY(subKey);

The code is-

clc; clear all; close all;
subKey = '';
save('subkey.mat','subKey');
load('subkey.mat');
[y_1_0, y_2_0, y_3_0] = generateParamY(subKey);
[x_0_1 x_0_2 x_0_3] = generateParamX(subKey);
[epsilon, mu, alpha_1, alpha_2, alpha_3] = generateParam(subKey);
newper
df
decry
INVPER
INVIMAGE

Can anyone help me with it

[Anagha Mittal]

Hi Deep,

Could you please share where you found the reference to "generateParam" function?

As per my understanding there is no pre-defined MATLAB function by this name.

If you want to use a custom function then consider having the function definition in the same script or as a separate function file added to the current MATLAB path.

Hope this helps!