Getting warning while running the attached code!!

MG
2022 3 30
1 个回答
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更新时间：2022 3 30
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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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 采纳的回答

Walter Roberson
Walter Roberson 2022-3-30
Ran in:

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Ran in:
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 = 

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MG
MG 2022-3-30
编辑：MG 2022-3-30
Thats a warning. My bad. btw thank you so much.

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