Solve a nonlinear equation with constrains

Question

Miraboreasu 2022-12-15

0
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https://ww2.mathworks.cn/matlabcentral/answers/1879202-solve-a-nonlinear-equation-with-constrains

编辑： Torsten 2022-12-16

Hello,

clear 
p0=1000e6;
t0 = 1e-6;
td = 1e-6;
t  = t0 + td;
c  = 5e6;
a  = @(r)log(r)./(t0*(r-1.0));
b  = @(r)a(r).*r;
func= @(r) p0*((exp(-a*t) - exp(-b*t))/(exp(-a*t0) - exp(-b*t0)))-c;
r=1.5;
roots = fzero(func,r)

my equation is the func.

where a and b are,

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Bora Eryilmaz 2022-12-15

编辑：Bora Eryilmaz 2022-12-15

Your function "p(t)" (func in your code) is not a function of time since you are assigning a fixed scalar value to "t" in your code. So, func() is a function of r, with a fixed "t". So what you are really solving here is p(r) = 0 given fixed values for t, t0, a, b, c.

You will need to reformulate your problem.

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