Hi Ridhima,
As per my understanding, you want to know the input parameters for the "LDA" function.
The "LDA" function takes two input arguments, the first being "X", which is the feature vector, which will be the DCT coefficient in your case, and the second input to the function is "L", which is the target class. The same can be found in the "main.m" file on the file exchange link for the function.
I hope this helps!
