Multiple Input DIalog Box

I have a problem where I need to accept the value of a number (say n, which is incidentally the no of circles to be accepted for the problem) and depending on the value of n I need to accept 2n values into an array nx2(these will be actually the coordinates of the centers of the n circles, where each row of the matrix represents the x and y coordinate of one circle)...I want to design an input box first that will ask the user to input the value of n. Depending on the value of n entered, thereafter an input dialog should open asking for 2n center values. the dialog can be of the following form

     Enter the center of 1st circle      ______   _______
     Enter the center of 2nd circle      ______   _______
     Enter the center of 3rd circle      ______   _______
     Enter the center of 4th circle      ______   _______
     Enter the center of 5th circle      ______   _______

Any idea how I can design an input box for such problems??Thanks in advance

[Walter Roberson]

My email address is not an acceptable Tag.

Answer 1

[Jose Jeremias Caballero]

Hi.

%=======================
clear all
n=input('Enter the number of circles n:');
k=1;
while k<=n
    center(k,:)=input(['Enter the center of ',num2str(k),' st circle:']);
    k=k+1;
end
display(center)
x=center(:,1);
y=center(:,2);
%=============================

>> %EXECUTION
>> ncircles
Enter the number of circles n:3
Enter the center of 1st circle:[10 4]
Enter the center of 2st circle:[2 2]
Enter the center of 3st circle:[5 3]

center =

      10     4
       2     2
       5     3

>> %EXECUTION
>> ncircles
Enter the number of circles n:5
Enter the center of 1st circle:[2 3]
Enter the center of 2st circle:[3 1]
Enter the center of 3st circle:[3 4]
Enter the center of 4st circle:[-5 6]
Enter the center of 5st circle:[10,12]

center =

       2     3
       3     1
       3     4
      -5     6
      10    12

>>