matlab2023a中解方程
1、matlab中解方程的函数是solve
2、查看帮助:
help solve
help solve --- sym/solve 的帮助 --- sym/solve - Equations and systems solver This MATLAB function solves the equation eqn for the variable var. 语法 S = solve(eqn,var) S = solve(eqn,var,Name,Value) Y = solve(eqns,vars) Y = solve(eqns,vars,Name,Value) [y1,...,yN] = solve(eqns,vars) [y1,...,yN] = solve(eqns,vars,Name,Value) [y1,...,yN,parameters,conditions] = solve(eqns,vars,'ReturnConditions',true) 输入参数 eqn - Equation to solve symbolic expression | symbolic equation var - Variable for which you solve equation symbolic variable eqns - System of equations symbolic expressions | symbolic equations vars - Variables for which you solve an equation or system of equations symbolic vector | symbolic matrix 名称-值参数 Real - Flag for returning only real solutions false (默认值) | true ReturnConditions - Flag for returning parameters and conditions false (默认值) | true IgnoreAnalyticConstraints - Simplification rules applied to expressions and equations false (默认值) | true IgnoreProperties - Flag for returning solutions inconsistent with properties of variables false (默认值) | true MaxDegree - Maximum degree of polynomial equations for which solver uses explicit formulas 2 (默认值) | positive integer smaller than 5 PrincipalValue - Flag for returning one solution false (默认值) | true 输出参数 S - Solutions of equation symbolic array Y - Solutions of system of equations structure y1,...,yN - Solutions of system of equations symbolic variables parameters - Parameters in solution vector of generated parameters conditions - Conditions under which solutions are valid vector of symbolic expressions 示例 Solve Quadratic Equation Solve Polynomial and Return Real Solutions Numerically Solve Equations Solve Multivariate Equations and Assign Outputs to Structure Solve Inequalities Solve Multivariate Equations and Assign Outputs to Variables Use Parameters and Conditions to Refine Solution Shorten Result with Simplification Rules Ignore Assumptions on Variables Solve Polynomial Equations of High Degree Return One Solution 另请参阅 dsolve, isolate, linsolve, root, subs, symvar, vpasolve, Solve Symbolic Equation 已在 R2006a 之前的 Symbolic Math Toolbox 中引入 sym/solve 的文档 solve 的其他用法
3、点击示例下的
Solve Quadratic Equation,打开![](https://img2023.cnblogs.com/blog/1150269/202306/1150269-20230620170024562-237778289.png)
4、照着输入下,应该就差不多明白了,有一点注意,定义符号变量是syms,不是sym了:
syms x; solve([x^3+6*x^2+8*x+15==0],[x]) ans = -5 - (11^(1/2)*1i)/2 - 1/2 (11^(1/2)*1i)/2 - 1/2
人就像是被蒙着眼推磨的驴子,生活就像一条鞭子;当鞭子抽到你背上时,你就只能一直往前走,虽然连你也不知道要走到什么时候为止,便一直这么坚持着。