Error when solving system of equations with fsolve

2 次查看（过去 30 天）
Giorgos Papakonstantinou
I have the following system to solve:
syms x
f = @(x) [(2*x(1).^2-2.*x(2).^3+1)/4; (-x(1).^4-4*x(2).^4+8.*x(2)+4)/12];
R = fsolve(f,[0 0]);
Instead of writing f as suggested above I wanted to write f as the shown below:
f1=(2*x(1).^2-2.*x(2).^3+1)/4;
f2=(-x(1).^4-4*x(2).^4+8.*x(2)+4)/12;
f=[f1;f2];
when I insert the command
R = fsolve(f,[0 0]);
I get the following error.
Error using mupadmex
Error in MuPAD command: Index exceeds matrix dimensions.
Error in sym/subsref (line 1389)
B = mupadmex('symobj::subsref',A.s,inds{:});

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2013-5-13
You cannot use FSOLVE to solve symbolic equations. You would use SOLVE instead.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Numeric Solvers 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by