MATLAB Answers

Solving an inequation of first degree issue

4 ビュー (過去 30 日間)
Rodrigo Toledo
Rodrigo Toledo 2021 年 4 月 1 日
編集済み: John D'Errico 2021 年 4 月 1 日
i am trying to solve this inequation:
a = 3*x + 21 <= 5*x + 13
the answer matlab is giving me when i use:
is 5. But the answer should be x>= 4. What i am doing wrong here?


John D'Errico
John D'Errico 2021 年 4 月 1 日
編集済み: John D'Errico 2021 年 4 月 1 日
syms x
a = 3*x + 21 <= 5*x + 13
a = 
asol = solve(a,'returnconditions',true)
asol = struct with fields:
x: [1×1 sym] parameters: [1×1 sym] conditions: [1×1 sym]
ans = 
ans = 
It looks like x >= 4 is the solution.
When you have a problem with multiple solutions, certainly an inequality like this, you need to tell MATLAB to describe the solution properly. When all I do is use solve on a, what does it do? It gives me AN answer, a valid solution to the problem.
ans = 
Read the help docs for solve, where it explains the use of this property.

その他の回答 (0 件)


Community Treasure Hunt

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

Start Hunting!

Translated by