how to get coordinates from a value of the coordinates itself?

hi all, i want to ask something about getting coordinates from the value of something using matlab, soo i have this code :

R = HarrisMeasure(x,y);
R = abs(R);
sortedR = sort(R,'descend');

best = sortedR(1:50,:);

x and y is the inputed coordinates, so how can i get the coordinates after i sorted it? how can i get coordinates of 'best'? thank you

[Mirza M]

all i wanna do here is after i got the coordinates, i want to use

imshow(I); hold on  
plot(a,b,'r*')

(a,b) for (x,y) of best, so the output will be a red dot in the best output

[Jan]

Please notice, that we do not know, what your function HarrisMeasure does. So how could we guess, how x,y are correlated to R?

Answer 1

[Image Analyst]

Look at the second return argument from sort(). I think you can use that.

[Mirza M]

im sorry but i dont understand how? i want to get x and y of every sortedR, how to do that? i dont even know how to get x and y from R, how's the code?

[Image Analyst]

Impossible to know, because I don't know what HarrisMeasure does. You need a function that does the inverse of HarrisMeasure(), like

[x, y] = InverseHarrisMeasure(R);

but I imagine there are lots of x,y that could have a particular R value.