This time domain diagram has been drawn, but if you want to draw its outer outline, how should you command it?
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The determinant of a 10*10 matrix is solved, but the result is very long, like the numerical way to solve, but did not find the appropriate method, the Analytic solution is very slow, calculated for 5 hours has not been calculated.

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Lb1 represents a number of lengths, but I don't want to use a number to replace it now, but directly using eval, the variable in it becomes Lb1, unlike the following values show, how to write it like a number?

For a system of 8 equations, it takes too long for me to solve it by using solve, but I can only give one solution by using fsolve. If I want solutions in other ranges, I need to provide a general range, but I don't know the range, how can I quickly find all the solutions?question1118.mw

How do you convert this system of equations into matrix form? The decoupling process is performed.Convert the equations into photographs.fuxian1030.mw