positive solutions error when solving eqn

1 次查看（过去 30 天）
matlab
matlab 2020-6-23
编辑： madhan ravi 2020-6-23
Solving for how the error below can be solved:
syms y
x = 0.001;
z = 0.0009;
eqn = y^3 - 3*x*y + 3*z*x == 0
Sol_z = solve(eqn,y,'Real',true)
Sol_z =
9.0024e-04
0.0543
-0.0552
%here I can not get the only positive solutions that I want (i.e. 0.054 and 9.0024e-04)
if (Sol_z > 0)
b = Sol_z
end
"Conversion to logical from sym is not possible."
how can i solve this error and get the only positive solutions using the code above

请先登录，再回答此问题。

采纳的回答

madhan ravi
madhan ravi 2020-6-23
编辑：madhan ravi 2020-6-23
Sol_z(double(Sol_z) > 0)

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Symbolic Math Toolbox 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by