For-Loop vs While-Loop

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Maroulator
Maroulator 2014-8-10
评论： Maroulator 2014-8-11
I have the code in Part1 below which stores the values of x and y after the last iteration of my while-loop. Is there a way for me to achieve to what I am trying to do in Part2; that is, to retain all values of x and y along the way as the loop is still running/prompting the user for inputs? I have already achieved this with a for-loop, but I need to be able to do this with a while-loop and have hit a wall.
Any ideas? Also, it would be nice to be able to display an error message when the while-condition no longer holds true; the only way I know how to do this is with an if-statement and disp construct, which doesn't seem to be working inside the while-loop (again, I've been able to accomplish this in a for-loop but would like to do it in a while-loop). Any thoughts are welcome.
*
Part1 - Currently have:*
temp=('Enter initial [x y] pair: ');
while isempty(temp)==0
x=temp(1);
y=temp(2);
temp=input('Enter next [x y] pair');
end
*Part2 - Would like to have:*
temp=('Enter initial [x y] pair: ');
while isempty(temp)==0
x=temp(1);
y=temp(2);
temp=input('Enter next [x y] pair');
end

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Image Analyst
Image Analyst 2014-8-10
You can have them enter some value that indicates when to quit, like if x or temp is negative of something
if x < 0
break;
end
or
if temp(1) < 0 || temp(2) < 0
uiwait(warndlg('Exiting loop because you entered a negative number'));
break;
end
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Image Analyst
Image Analyst 2014-8-10
Just use a counter that you increment each time:
counter = 1;
while...........
x(counter) = ..............
y(counter) = ...............
counter = counter + 1;
end
Maroulator
Maroulator 2014-8-11
Nice! Thanks again.

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