Dear friends I M. Saravanan, currently working in matlab attempting to plot some solutions of the differential equations. When plotting I received a command "Warning: Matrix is singular to working precision" for the solution step in the M files. Since as a beginner this statement make me to proceed further. The solution involves a lot of parameter so that by tuning the parameter I could get the plot. Also another command which I received is "Nan". I could be benefit enough if someone could be help me in this regard.