- Maximum (magnitude) positive = 8
- Minimum (magnitude) positive = 1
- Maximum (magnitude) negative = -9
- Minimum (magnitude) positive = -2
max and min values in an array
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Hello,
I am trying to find positive and negative maximum and minimum in an array.
Lets say I have a Matrix A=[1 -2 5;3 7 -9,4 6 8] if I use max and min functions on A,I get max(A)=[4 7 8] and min(A)=[1 -2 -9]. Since I wanted one singe number I performed max and min operations again.
max(max(A))= 8 and min(min(A))=-9
My requirement here is to get both positive and negative maximum and positive and negative minimum. Is there any way to find that?
Thank you.
1 Comment
the cyclist
on 12 Dec 2016
Your language is not very clear to me. By "maximum" and "minimum", are you talking about the magnitude? So, is the following correct?
Answers (2)
the cyclist
on 12 Dec 2016
Edited: the cyclist
on 12 Dec 2016
If what I said in my comment is correct, then do the following:
maxMagPos = max(A(A>0))
minMagPos = min(A(A>0))
maxMagNeg = min(A(A<0))
minMagNeg = max(A(A<0))
3 Comments
the cyclist
on 12 Dec 2016
The best form of thanks is upvoting and/or accepting answers. This rewards the contributor, and points future users to good answers.
I suggest you open a new post for your second question, which is quite different in nature, not really related to this one.
dpb
on 12 Dec 2016
@OP If this is something you do more than once, then I'd suggest writing a little utility function that returns the values in a single call; either the four variables or an array depending on how your application most frequently would use the results.
dpb
on 12 Dec 2016
It's the colon operator that's your friend here...
mnx=min(x(:)); % doc colon for details of the "magic" here...
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