# selecting values between vectors and plot the values

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michael on 18 Jan 2021
Edited: dpb on 19 Jan 2021
Hi,
I have 4 vectors which are unsorted. All have all same length of 360:
Ax, Bx - Values are real numbes between 0 to 360. Values are increasing / decreasing and with modulu 360.
Ay,By - corrolated to Ax, Bx. real numbes between 0 to 180.
(Best was to describe thos vectors are as single sine with phase shift and/or reversal (i.e. -sin(x) )).
I need to:
1. find max between Ay, By at given point of x vectors.
2. plot the max value with appropriate value from Ax or Bx.
What I've though is:
1. sort Ax, Bx and to find the original order (sorting will provide me the initial value which is close to 0.
2. based on the indexes of the sorting, find Y=max (Ay(idx_a), By(idx_b))
3. running in for loop in order to find whether the Y(i) is related to Ay to or By and set X from Ax or Bx.
4. plot(X,Y)
I think that this is not so elegant solution.
Would be glad to have a proposal for a more elegant one.

dpb on 18 Jan 2021
Edited: dpb on 19 Jan 2021
isA=(Ax>Bx);
ABx=Bx; ABx(isA)=Ax(isA);
plot(ABx,max(Ay,By))
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dpb on 19 Jan 2021
Edited: dpb on 19 Jan 2021
Yeah, good catch. Cut 'n pasted, then missed the correction when added subscripts thought was done...codger short term memory ain't what it usta' be... :(