how to arrange x-coordinate w.r.t y-coordinates?

I have a pair of coordinates (x,y) , I arranged it in increasing order of y by using

sortrows(A,2) % A is matrix with first column as x-coordinate and 2nd column as y-coordinates.

I have

(4,0)

(10,1)

(7,2)

(6,3)

(9,4)

(1,5)

(1,6)

(9,7)

(6,8)

(7,9)

(10,10)

But now I want to arrange the x-coordinates if y-coordinate is given like I want to arrange x ,w.r.t y-coordinate [ 0 7 7 4 1 7 3 3 10 2] , In other words I want tp arrange it w.r.t to y-coordinate if y is given how to search for x ,I need the following

(4,0)

(9,7)

(9,7)

(9,7)

(10,4)

(9,7)

(6,3)

(6,3)

(10,10)

(7,2)

[Torsten]

The y-coordinate you prescribe in your vector always exists in the matrix ? And after sorting they come out to be 0,1,2,3,4,5,6,7,...,n ?

[Ammy]

Yes, the y-coordinate always exists, but I want a secific x-coordinate corresponding to y-coordinate [ 0 7 7 4 1 7 3 3 10 2]

[Ammy]

The y-coordinate you prescribe in your vector always exists in the matrix ? Yes

And after sorting they come out to be 0,1,2,3,4,5,6,7,...,n ? Yes, exactly

[Torsten]

Something like

As = sortrows(A,2);

x = As(y(:)+1,1)

where y is the vector of y-coordinates ?

[Ammy]

@Torsten thank you very much. its working. How can I accept this answer?

[Torsten]

Thanks, I copied my comment into an answer field.

[Ammy]

Thank you.

Answer 1

[Torsten]

Something like

As = sortrows(A);

x = As(y(:)+1,1)

where y is the vector of y-coordinates ?

Answer 2

[Kartikay Sapra]

A = [1 2; 3 4; 5 6]

map = containers.Map

[row col] = size(A)

for i = 1:row
    A(i,1)
    map(int2str(A(i,1))) = int2str(A(i,2))

end 

y = input('Enter y coordinate')
str2num(map(int2str(y)))

You can try using a map object, here, you can place y co-ordinates as keys and x co-ordinates as value. Whenever we want the corresponding x value, search value of y

[Ammy]

@Kartikay SapraThank you very much for your valueable comment, but my problem is solved with @Torsten answer.