Solving Inequalities with Matlab
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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 =
'9.13.0.2105380 (R2022b) Update 2'
>> syms x real
>> solve(abs(x-2) > 2*abs(x+1), x)
ans =
-2
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.
采纳的回答
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)
4 个评论
Dimitrios Anagnostou
2023-3-27
Dyuman Joshi
2023-3-27
Yes, refer to Solving Inequalities - documentation solve
Steven Lord
2023-3-27
Yes, on the documentation page for the solve function. This documentation page also includes an example, "Solve Inequalities", that shows its use.
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