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Solve function returns Warning and empty matrix

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Akash Batra
Akash Batra 2015-6-16
回答： Eric Lin 2015-6-17
I run this code to solve for u and v
syms u v
S = solve([2*u + v == 0, u - v == 1], [u, v])
I get warning saying I have 4 equations and 2 unknowns and a warning that says it cannot find an explicit solution when there is a clear solution to the system. I have other codes that I try to use solve and get the same warnings.
Is there a toolbox I need to download or why can't I use solve?
  1 个评论
Walter Roberson
Walter Roberson 2015-6-16
As an experiment try
S = solve([2*u + v, u - v - 1], [u, v])
If that works then you might be running an older version of MATLAB that does not handle "==" for symbolic variables.

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回答（1 个）

Eric Lin
Eric Lin 2015-6-17
To add to Walter's answer, the "==" notation was introduced in R2012a: R2012a Release Notes - New Relational Operators Create Equations, Inequalities, and Relations

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