matlab code for solving the eigenvalue equation for a single mode step index fiber

any one with a matlab code for solving the eigenvalue equation for a single mode step index fiber,and also a matlab code for solving the general equation for a finite difference method
thank you

Follow the links below to learn how to use matlab

File Type: pdf MATLAB_Simulink_tutorial.pdf (284.0 KB)
File Type: pdf slides_16.06_16.07_matlab_simulink.pdf (280.8 KB)
File Type: pdf Training_TUM_GS_Simulink.pdf (2.08 MB)
File Type: pdf Using_Matlab_Simulink.pdf (1.30 MB)