Help aligning two vectors with one centred on zero.

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Jason
Jason on 25 Oct 2016
Commented: Chaya N on 25 Oct 2016
I have a set of x values:
x1=-31, -15.5, 0, 14.9,30.2
I know that the separation should be 15 (=pitch) so I want to plot x1 against xreal then do a fit and look at the largest deviation.
I can create:
xreal=Pitch*((1:numel(x1)));
But I can't figure out how to align them AROUND 0,e.g
xreal = -30, -15, 0 , 15, 30
then I can easily plot x1 against xreal and linearly fit.

Accepted Answer

LauraLee Austin
LauraLee Austin on 25 Oct 2016
How about this, it should allow the location of 0 in x1 to change and the number of values in set x1 to be variable as well. if true
x1 = [-31, -15.5, 0, 14.9,30.2];
Pitch = 15;
idx = find(x1==0);
numel(x1)
xreal=(Pitch*(1-idx)):Pitch:(Pitch*(numel(x1)-idx));

More Answers (2)

Chaya N
Chaya N on 25 Oct 2016
Edited: Chaya N on 25 Oct 2016
xreal=Pitch*((1:numel(x1)) - ceil(numel(x1)/2))
  2 Comments
Chaya N
Chaya N on 25 Oct 2016
"...align them AROUND 0"
Exactly as asked!

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Matt J
Matt J on 25 Oct 2016
xreal=xreal-mean(xreal);
  3 Comments
Jason
Jason on 25 Oct 2016
Yes sorry, I only thought of it after you had answered.

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