center point between 2 data group

can any body help me, i got a problem. in the picture, there are 2 data group.can any body tell me, how to find the algorithm to decide center point of two data group ( red mark point) and what the priciples can solve it ?

can i use matlab to solve it?

Answer 1

[Image Analyst]

Perhaps kmeans() in the Statistics Toolbox. Specify 2 clusters. Otherwise if you know what ranges your data lies in, in advance, you can sum your data points horizontally and look for the "gap", which you should find between 20 and 30 for this particular data set.

[jakv]

excuse me,can you give me a reference about algorithm? sorry , i'm newbie

[Sukuchha]

type doc kmeans if yuou have statistics toolbox

[Image Analyst]

http://en.wikipedia.org/wiki/Kmeans

An example using it:

http://www.mathworks.com/products/demos/image/color_seg_k/ipexhistology.html

[jakv]

thanks all, i'll try it.

[Image Analyst]

So how did it work out?

[jakv]

by the way, what the algorithm that i can be used to solved centroid in two cluster above? in other view, i don't have the spesified data of the cluster so i just to find out the algorithm only.

can anyone help me?

[jakv]

by the way, what the algorithm that i can be used to solved centroid in two cluster above? in other view, i don't have the spesified data of the cluster so i just to find out the algorithm only.

can anyone help me?

[Image Analyst]

There are probably lots of algorithms. You can look up kmeans on the web if you want that algorithm (because you said you have two clusters). There are other methods such as http://www.mathworks.com/matlabcentral/fileexchange/35014-clusterdata if you don't know the number of clusters. Please mask my Answer as Ac we're done now.