How to select one point as the center of the plot

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!

[Adam Danz]

Are you asking how to shift the entire data set so that the selected point is at (0,0,0)?

[Andrew]

yes so it's at the center of the plotted graph.

[Adam Danz]

How are you selecting the point? Clicking on it with your mouse? Indexing a row in your table?

[Andrew]

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]

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.

Answer 1

[DGM]

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)

[Andrew]

Yes, I love the first option, thank you very much! Exactly what I'm trying to do