Getting warning while running the attached code!!

Question

MG 2022-3-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1683824-getting-warning-while-running-the-attached-code

编辑： MG 2022-3-30

clear all;
close all;
clc;
syms x
E = 30e3;
s_u= 114;
k_p = 154;
n_p = 0.123;
s_f_p = 169;
e_f_p =1.14;
b = -0.081;
c = -0.67;
N = logspace(0,6);  % 2N_f
k_f = 2.22;
s_nom = 50;
s_e_peak = (k_f*s_nom)^2/E
eqn = x*((x/E) + (x/k_p)^(1/n_p)) == 0.4107;
 sol = solve(eqn)

Warning: Solutions are parameterized by the symbols: z2. To include parameters and conditions in the solution, specify the 'ReturnConditions'

value as 'true'.

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Answer 1

Walter Roberson 2022-3-30

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https://ww2.mathworks.cn/matlabcentral/answers/1683824-getting-warning-while-running-the-attached-code#answer_930159

在 MATLAB Online 中打开

That is not an error.. but it can be a nuisance.

format long g

syms x

E = 30e3;

s_u= 114;

k_p = 154;

n_p = 0.123;

s_f_p = 169;

e_f_p =1.14;

b = -0.081;

c = -0.67;

N = logspace(0,6); % 2N_f

k_f = 2.22;

s_nom = 50;

s_e_peak = (k_f*s_nom)^2/E

s_e_peak =

0.4107

eqn = x*((x/E) + (x/k_p)^(1/n_p)) == 0.4107;

sol = solve(eqn, 'returnconditions', true)

sol = struct with fields:

x: z2^123 parameters: z2 conditions: 1875*154^(107/123)*z2^1123 + 3044854222373485984*z2^246 - 37515648873863720808864 == 0 & -pi/123 < angle(z2) & angle(z2) <= pi/123

cond1 = children(sol.conditions,1)

cond1 =

p = sym2poly(lhs(cond1));

z_sols = roots(p);

cond2 = children(sol.conditions,2) & children(sol.conditions,3)

cond2 =

mask = simplify(subs(cond2, z_sols));

valid_sols = z_sols(logical(mask));

overall_sol = vpa(subs(sol.x, sol.parameters, valid_sols))

overall_sol =