# compute iterations to calculate pairs of data that do not repeat

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P_L 2019-4-16

Hi there I have 15 sets of x,y,z data points. I want to compute 105 possible combinations of these points using a computational method. I believe I will want to use a loop although I am not sure how to set one up that discards any repeating combinations.
This is the code I have:
% script to caluclate the correlation dimension of points
% with delta[log N_D (R)] / delta (log R) ( taken from Kagan.Y (2007)
% Earthquake spacial distribution: The correlation dimension.
% where
% D = dimensionality = 3-D
% N = total number of earthquake pairs = n(n-1)/2
% R = distance between points = sqrt((x2-x1)^2 + (y2-y1)^2 + (z2-z1)^2)
N = 15*(15-1)/2 %the number of pairs I can have
% The Data set (15 points)
x_vals=[-9.33203 -9.92969 -9.40234 -9.47266 -8.83984 -9.50781 -10.0703 -9.08594 -9.50781 -10.0352 -9.12109 -9.05078 -9.26172 -9.82422 -10.3516];
y_vals=[27.8633 27.6172 27.6523 27.5117 27.9336 27.6172 27.3359 27.6172 27.6172 27.2305 27.9336 28.0039 27.793 27.7227 26.7734];
z_vals=[10.0098 8.04297 8.97461 7.98086 9.51289 8.04297 10.1133 10.0305 7.96016 7.98086 9.47148 7.77383 8.76758 9.34727 7.79453];
Any help would be much appreciated!

### 采纳的回答

KSSV 2019-4-16
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P_L 2019-4-16
Hi KSSV I don't understand, please could you explain more clearly? I need combinations of x,y and z data.
Many thanks

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