detecting the points inside circle

In the image below,i have drawn a circle over a surf points,please tell how to find that surf point inside the circle

http://imgur.com/RsRHy2V

the code i used is

[p,f]=uigetfile();

I=imread(strcat(f,p));

% imshow(I)

 I1=rgb2gray(I);
points = detectSURFFeatures(I1);
imshow(I); hold on;
plot(points.selectStrongest(100))
[x1 y1 r]=circle_saptha4(plot(points.selectStrongest(100)));

where circle_saptha4 is a function program,for drawing a circle

please tell is it possible to find the point inside that circle

[Image Analyst]

I'm not sure what you mean by "find the point". You already know everything about the point including its location because you drew a circle around it. What more do you want to know?