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

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Oscar Zampi
Oscar Zampi on 17 Feb 2021
Commented: Oscar Zampi on 17 Feb 2021
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!

Answers (1)

Image Analyst
Image Analyst on 17 Feb 2021
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:
Oscar Zampi
Oscar Zampi on 17 Feb 2021
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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