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keep just positive or just negetive answer of acos?

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Najmeh Eskandari
Najmeh Eskandari on 12 Aug 2018
Edited: jonas on 13 Aug 2018
I have arccos and I want to keep just negative answer of it? how can I do it?(there are two answer)

Accepted Answer

jonas
jonas on 12 Aug 2018
If A is a vector with your answers. Remove non-negatives by
A(A>=0)=[]
  2 Comments
jonas
jonas on 13 Aug 2018
I don't understand. What function did you use? The fact that you want to keep only one value implies that you have two, hence my simple fix.
MATLAB's acos however only returns a single positive solution. If you want a negative solution, just multiply by -1, as cos(x)=cos(-x)
"For real elements of x in the interval [-1,1], acos(x) returns real values in the interval [0,pi]." - the doc

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