Why do all my points not all plot at the same time?

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Oscar Zampi
Oscar Zampi 2021-2-17
评论： Oscar Zampi 2021-2-17
Hi,
I have a ssection of code that includes a for loop that creates points to plot. I am wantinf each point to be plotted at the same time, but after a new one appears the other dissapears. I have used 'hold on' and this seems to have no effects. The section of the loop responsible for the points is as folows:
for m = 1:5
i = randm(m,1);
j = randm(m,2);
Txx = j + 207000 ;
Txy = i + 909000;
Rxx = 208985;
Rxy = 911073;
fprintf('x is %d and y is %d \n',Rxx,Rxy);
R = worldfileread('concord_ortho_w.tfw', 'planar', size(ortho));
figure (1)
mapshow(ortho, cmap, R);
hold on
plot(Txx, Txy,'g.')
Any help would be greatly appreciated!

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回答（1 个）

Image Analyst
Image Analyst 2021-2-17
Your for loop needs an "end". And comment out firugre(1) - not sure if that messes up the hold now, plus it's not needed. Also if you want it to plot after each iteration use drawnow:
drawnow;
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Walter Roberson
Walter Roberson 2021-2-17
You are displaying the same map each time. That is going to draw on top of the existing axes, hiding any solid area beneath it.
You should display the map once and then loop drawing the points on top.
Oscar Zampi
Oscar Zampi 2021-2-17
Hi, yes I have realised my mistake! I just needed to display the map before the loop, this has sorted it out. The inclusion of drawnow has also worked.
Thank you for your help!

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