how can jump and go to line

suppose i create array and the i enter the no.this no will be checked in the first column of the array and then send other data from second and third column which is corresponding to the no.

 in_zone=nonzeros(zone);
 Y1=[X1(in_zone,:)];     % Y1 will contain coordinates value X and Y every in_zone
 XY=horzcat(inzone,Y1)   %XY will merge in_zone and Y1 value 
 N=input('enter the number :');
 N1=find(XY(:,1)==N)  %find the value from XY first column
  N2=XY(N1,[2,3])      %this will show corresponding value of N1
  X6=N2(1);
  Y6=N2(2);

now i wish to create jump statement or alternative if no N is not found in XY first column then it will jump again to N.. thanks in advance

Answer 1

[Michael Haderlein]

There is no jump keyword in Matlab. You can just check like

N=input('enter the number :');
N1=find(XY(:,1)==N);  %find the value from XY first column

if isempty(N1)
  errordlg('Value does not exist!')
else
  N2=XY(N1,[2,3]);      %this will show corresponding value of N1
  X6=N2(1);
  Y6=N2(2);
end

Or, if you want to insist on a correct value:

N1=[];
while isempty(N1)
   N=input('enter the number :');
   N1=find(XY(:,1)==N);  %find the value from XY first column
end

N2=XY(N1,[2,3])      %this will show corresponding value of N1
X6=N2(1);
Y6=N2(2);