working_nonlinear.mw helo guys having problem in plotting graph. Please help me out

hey friends please check this code and help me in removing errors. working_nonlinear.mw

hey friends am attaching file in which i have wrote small analysis of my poblem. I have already done this for other problem which does not include term L. But here problem is due to term L. Am no able to write code for this tri daigonal matrix. Please help me in finding unknown coefficients Analysis_of_metho.docx

hey friends please check this code for me..working1.mw

hey friends please help me out of this error hmm_working.mw. 

thanks