Solving Inequalities with Matlab

58 views (last 30 days)
I guess this is a frequent question here but the answers I have seen did not help me.
I want to solve the following inequality: |x-2| > 2|x+1|.
Manually, we get
In Mathematica there is the built-in function Reduce.
In[58]:= Reduce[Abs[x - 2] > 2 Abs[x + 1], x, Reals]
Out[58]= -4 < x < 0
With Matlab I get
>> version
ans =
' (R2022b) Update 2'
>> syms x real
>> solve(abs(x-2) > 2*abs(x+1), x)
ans =
There is this answer here that uses Mupad's Solve function but apparently it does not work anymore.
Is there a way to use a Matlab function, not necessarily solve to get the correct domain? Thank you very much.

Accepted Answer

Dyuman Joshi
Dyuman Joshi on 27 Mar 2023
You need to use 'ReturnConditions' as true to obtain the conditions on the solution
syms x real
sol=solve(abs(x-2) > 2*abs(x+1), x,'ReturnConditions',true)
sol = struct with fields:
x: x parameters: x conditions: x < 0 & -4 < x

Sign in to comment.

More Answers (0)




Community Treasure Hunt

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

Start Hunting!