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How would i loop/do this when there are two possibilities at certain points

When the lake is 90% full, the withdrawal rate will be adjusted to 3 times the normal rate.
When the capacity of the lake is back to 70%, the withdrawal rate will be adjusted back to
normal.

When the lake is lower than 30% full, the withdrawal pump will be closed. When the
capacity of the lake is back to 50%, the withdrawal rate will be adjusted back to normal.

When the lake is over 100% full, a warning message should be issue

What's the matlab code for creating random symmetric positive definite matrix?

The degree-n Chebyshev polynomial is defined by
Tn(x) = cos[ncos-1(x)], -1 <= x <= 1.
These satisfy To(x) = 1, T1(x) = x, and the recursion relation
Tn+1(x) = 2xTn(x) - Tn-1(x), n >= 1.
Write a function Chebeval (x,N) that evaluates all of the Chebyshev polynomials of degree less than or equal to N at all of the points in column vector x. The result should be an array of size length (x) by N+1.

how can I make a programme to solve simultaneous linear equation.