Request for a functioned version of the 'analysis' and 'design'

[HaoLi111]

This optimisation of solar powered plane can be generalized. And if , with default values we can write functions for the whole script, e.g.'analysis'.

The values in the script can be used as default values.

Also if this takes longer time maybe we can keep the original version but make a faster version simplifying the inner expressions, (maybe with CAS derive the expressions first and then put the expressions into body of the function to speed it up, as there are at least 3 sets of for loops in the optimization functions).