Can someone please fix my matlab code? Don't know how to get rid of the warning: Unable to solve symbolically. Returning a numerical solution using vpasolve.

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Hamza Aboumaray
Hamza Aboumaray 2020-5-6
评论： Hamza Aboumaray 2020-5-6
% Values of constants
syms r V L h
r = 0.3;
V = 0.35;
L = 3;
eqn = (0.5*pi*r^2-r^2*asin(h/r)-h*sqrt(r^2-h^2))*L == V;
answer = solve(eqn, h)
depth = r - answer
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Star Strider
Star Strider 2020-5-6
The warning is not the problem.
It is not possible to solve symbolically for ‘h’. A numerical solution is the best you can do.

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Walter Roberson
Walter Roberson 2020-5-6
r = 0.3;
You used one significant digit in your coefficients. In science that means that r is some undetermined value in the range 25/100 inclusive to 35/100 exclusive. And since your input coefficients are indeterminate, it is a category mistake to request an infinitely precise closed form solution, which is what solve() is designed to do. You should be using vpasolve or a numeric technique such as fzero()
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Walter Roberson
Walter Roberson 2020-5-6
% Values of constants
syms h
r = 0.3;
V = 0.35;
L = 3;
eqn = (0.5*pi*r^2-r^2*asin(h/r)-h*sqrt(r^2-h^2))*L == V;
answer = vpasolve(eqn, h)
depth = r - answer

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