Help aligning two vectors with one centred on zero.

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Jason
Jason 2016-10-25
评论： Chaya N 2016-10-25
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.

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采纳的回答

LauraLee Austin
LauraLee Austin 2016-10-25
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));

更多回答（2 个）

Chaya N
Chaya N 2016-10-25
编辑：Chaya N 2016-10-25
xreal=Pitch*((1:numel(x1)) - ceil(numel(x1)/2))
  2 个评论
Jason
Jason 2016-10-25
doesn't this assume that the x1 values are symmetrical around 0. although shown in the example, this may not always be the case.

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Matt J
Matt J 2016-10-25
xreal=xreal-mean(xreal);
  3 个评论
显示 1更早的评论
Matt J
Matt J 2016-10-25
编辑：Matt J 2016-10-25
The mean of xreal would still be at zero. That is the only interpretation of the requirement "centered AROUND 0" that we can intuit from your post.
Jason
Jason 2016-10-25
Yes sorry, I only thought of it after you had answered.

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