How not to terminate the polyxpoly loop, when the lines don't intersect?

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Lukasz Zaczek
Lukasz Zaczek 2021-3-25
评论： darova 2021-3-27
V=1;
while V<=21
[xx12(V),yy12(V)] = polyxpoly([x01 x1(V)],[y01 y1(V)],[x02 x2(V)],[y02 y2(V)]);
plot(xx12(V),yy12(V),'o'); axis([-80 80 -10 100]);
pause(1);
V=V+1;
end
Hello. I have a code in which I mark the intersection point of two different lines every second. The loop works fine, but only until the lines actually intersect. For example, when they are parallel, an error 'Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.' occurs, and the loop stops running.
Is there any way, that in this case the loop doesn't terminate, but continues to the next iteration?

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darova
darova 2021-3-26
What about if..else statement?
[x,y] = polyxpoly(...);
if ~isempty(x)
% code
end
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