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How to select one point as the center of the plot

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Andrew
Andrew 2023-4-30
评论： Andrew 2023-5-1
Hi I have a 3d scatter plot where I can select specific datasets in my table
ix=iswithin(T.Num,12,25)
hSc3 = scatter3(T.CED(ix),T.r(ix),T.E0(ix),'filled');
function flg=iswithin(x,lo,hi)
% returns T for values within range of input
% SYNTAX:
% [log] = iswithin(x,lo,hi)
% returns T for x between lo and hi values, inclusive
flg= (x>=lo) & (x<=hi);
end
My question is, what would I need to do to select a specific element to be the center of the plot (i.e. a specific "ix" as the origin) and everything else i splotted around it.
Please let me know, thanks!
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Andrew
Andrew 2023-5-1
right now the points that are selected for the plot is defined from:
ix=iswithin(T.Num,12,25) (i.e. rows 12-25)
I'm trying to figure out what i need to do if I want ix=18 to be the center for example.
Star Strider
Star Strider 2023-5-1
If I understand your question correctly, I would get the values of that point’s (x,y,z) coordinates, and subtract those values from every point in the plot. That point becomes the centre, and all the others shift appropriately.

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DGM
DGM 2023-5-1
编辑：DGM 2023-5-1
Ran in:
I see two answers, depending on the interpretation of the question.
Perhaps you want to center a reference point in the axes.
% generate some fake data
rng(123)
n = 20;
x = rand(n,1);
y = rand(n,1);
z = rand(n,1);
% specify reference point
refidx = 6;
ref = [x(refidx) y(refidx) z(refidx)];
% create the scatter plot
scatter3(x,y,z,30,z,'filled');
% mark the reference point for clarity
hold on
plot3(ref(1),ref(2),ref(3),'+','markersize',10)
% adjust limits so that marker is centered in the axes
xlim(ref(1) + [-1 1]*max(abs(xlim - ref(1))));
ylim(ref(2) + [-1 1]*max(abs(ylim - ref(2))));
zlim(ref(3) + [-1 1]*max(abs(zlim - ref(3))));
Or perhaps you want to shift all the points such that the reference point is at [0 0 0]
% generate some fake data
rng(123)
n = 20;
x = rand(n,1);
y = rand(n,1);
z = rand(n,1);
% specify reference point
refidx = 6;
ref = [x(refidx) y(refidx) z(refidx)];
% offset the data
xos = x-ref(1);
yos = y-ref(2);
zos = z-ref(3);
% create the scatter plot
scatter3(xos,yos,zos,30,z,'filled');
% mark the reference point for clarity
hold on
plot3(0,0,0,'+','markersize',10)

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