Question
Hi everyone, i need to do a dynamic plot.I have 2 vectors, x & y. So i have a coordinate (x,y). For example, i have (0,0) , (1,1), (3,3) , (4,4) and so on, and first i need a point or a dot at (0,0) and then (1,1). then (2,2) but (0,0) and (1,1) must still there in the plot. So the plot will be like a lot of points but ploted dynamically. This is my code: clear all clc close all table = readtable('laser_data.csv'); array = table2array(table); for i = 1:length(array) %LEFT hold on for k = 2:2:30 x = -0.018+array(i,k); y = 0.0899+array(i,k+1); xlabel('Distancia en el eje X') ylabel('Distancia en el eje Y') title('Obstáculos') h = scatter(x, y, 10, 'r'); drawnow limitrate %pause(0.00001) end drawnow %FRONT for k = 32:2:60 x = 0.05620-array(i,k+1); y = array(i,k); xlabel('Distancia en el eje X') ylabel('Distancia en el eje Y') title('Obstáculos') h = scatter(x, y, 10, 'r'); drawnow limitrate %pause(0.00001) end drawnow %RIGHT for k = 62:2:90 x = 0.018-array(i,k); y = -0.0899-array(i,k+1); xlabel('Distancia en el eje X') ylabel('Distancia en el eje Y') title('Obstáculos') h = scatter(x, y, 10, 'r'); drawnow limitrate % pause(0.00001) end drawnow end But it takes like 30 minutes to plot, and using this one: just takes 30 secs but i dont want lines, i want points. table = readtable('laser_data.csv'); array = table2array(table); h = animatedline('Marker','none'); for i = 1:length(array) %LEFT for k = 2:2:30 x = -0.018+array(i,k); y = 0.0899+array(i,k+1); xlabel('Distancia en el eje X') ylabel('Distancia en el eje Y') title('Obstáculos') addpoints(h,x,y) drawnow limitrate %pause(0.00001) end %FRONT for k = 32:2:60 x = 0.05620-array(i,k+1); y = array(i,k); xlabel('Distancia en el eje X') ylabel('Distancia en el eje Y') title('Obstáculos') addpoints(h,x,y) drawnow limitrate %pause(0.00001) end %RIGHT for k = 62:2:90 x = 0.018-array(i,k); y = -0.0899-array(i,k+1); xlabel('Distancia en el eje X') ylabel('Distancia en el eje Y') title('Obstáculos') addpoints(h,x,y) drawnow limitrate % pause(0.00001) end end
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Expert Answer
Prashant Kumar
PhD Expert
Answered Nov 20, 2025
h = animatedline('Marker','none');
There's your problem...
array=readmatrix('laser_data.csv'); % no point in a table to just convert to array...
hAL=animatedline('Marker','.','MarkerSize',3,'LineStyle','none'); % set a point marker, no line...
xlabel('Distancia en el eje X') % don't update static info every pass through loop
ylabel('Distancia en el eje Y')
title('Obstáculos')
for i=1:size(array,1) % length() is risky
%LEFT
for k = 2:2:30
x = -0.018+array(i,k);
y = 0.0899+array(i,k+1);
addpoints(hAL,x,y)
drawnow limitrate
%pause(0.00001)
end
...
Make same changes in rest. It would be better to factor code so don't have repeated identical loops with just constants changing between, but that's another exercise...
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