Why points on the object boundary are repeating after some interval using bwboundaries command in Matlab...?

Hello, I am using the bwboundaries command to detect the points on the boundary of 2-D object(Image),But i have observe one thing using bwboundaries command the points on the object boundary are repeating after some interval which i don't required. Please tell me how to detect exact number of points on the boundary without repetition..? Is there any alternative to detect exact number of points..? Please help me, my algorithm is not working because of the repetition of the points. Thanks in advance.

[Image Analyst]

Give an example with a very small array.

[harshal j]

My array is of size (1988x2)by using bwboundaries the co-ordinate of the point at row no 1066 is again repeating at 1433 which completely unaccepted,many pints are duplicated like this which is wrong in my case for eg x=[198,333;198,332;198,331;198,330;198,329;198,328;198,333;198,332] in array x 198,333;198,332 is repeating which wrong in my case

[harshal j]

[harshal j]

Please refer the above image

[Image Analyst]

bwboundaries works off white objects. You have two there - the outer one, and the one inside the black shape. So you'll get a cell array with 2 cells. Inside each cell is a N rows by 2 columns matrix of doubles. Which white blob has the repeated (x,y) coordinate, and what row is it at?

[harshal j]

Thanks for your comments, If two objects are there then you are right,i should get the two cell but after applying the bwboundaries in above image i am getting only one cell of size (1988x2)and row no 1066 is again repeating at 1433. Ok forget about above shape i just want to know is it possible to repeat the co-ordinates again..? is it right..?