How can I keep on rejecting the value of input until the value inputted is greater than 0? Like how can they loop separately until the correct value is input?

a=input('Please enter the X co-ordinate of the bottom left hand corner of the space: ');

dataX=a;

if dataX < 0

disp('An invalid value of x was entered');

else

disp('valid values of x co-ordinates were entered');

end

a=input('Please enter the Y co-ordinate of the bottom left hand corner of the space: ');

dataY=a;

if dataY < 0

disp('An invalid value of Y was entered');

else

disp('valid value of Y co-ordinate was entered');

end

Answer 1

[Alan Stevens]

Something like:

dataX = -1;
dataY = -1;

while dataX<0
    a=input('Please enter the X co-ordinate of the bottom left hand corner of the space: ');
    dataX=a;
    if dataX < 0
        disp('An invalid value of x was entered');
    else
        disp('valid values of x co-ordinates were entered');
    end

end

while dataY<0
    a=input('Please enter the Y co-ordinate of the bottom left hand corner of the space: ');
    dataY=a;
    if dataY < 0
        disp('An invalid value of Y was entered');
    else
        disp('valid value of Y co-ordinate was entered');
    end
end

[Youssef Barakat]

Thank you very much, this is exactly what I was trying to figure out.