Plotting every nth point from a table for a scatter3 plot

Hi,

I am using a scatter3 to plot easting, northing and elevation data from a text file loaded in as a table. I have 1,520,371 points but only wish to plot every 10th point. Is there a function that will allow me to do this? Thanks in advance!

Answer 1

[Star Strider]

If I understand correctly what you want to do, this should work:

x = rand(1520371,1);                                % Create Data
y = rand(1520371,1);                                % Create Data
z = rand(1520371,1);                                % Create Data
T = table(x, y, z);                                 % Create Table

plot3(T{1:10:end,1}, T{1:10:end,2}, T{1:10:end,3})
grid on

The approach will be the same even if the vector sizes are incorrect here.

[Kaylyn Bellais]

Thank you! I think we're getting there. When I tried that, it gave me a cubed plot. It should look more like the shape of an island. Should I index table.Eastingmeters, table.Northingmeters, table.Elevationmeters as x, y, and z? This is my current code:

T = readtable("C:\Users\Kaylyn\Documents\CE_566\BeachRecovery\Lidar_data\Job520480_2001_USGS_ATM_raw\AltJob520480_2001_USGS_ATM_raw.txt");

scatter3(table.Eastingmeters,table.Northingmeters,table.Elevationmeters, 'b','filled')

x=rand(1,1520371);

y=rand(1,1520371);

z=rand(1,1520371);

plot3(x(1:10:end),y(1:10:end),z(1:10:end));

grid on

[Star Strider]

My pleasure!

Do this:

T = readtable("C:\Users\Kaylyn\Documents\CE_566\BeachRecovery\Lidar_data\Job520480_2001_USGS_ATM_raw\AltJob520480_2001_USGS_ATM_raw.txt");
scatter3(table.Eastingmeters(1:10:end),table.Northingmeters(1:10:end),table.Elevationmeters(1:10:end), 'b','filled')

I do not have your data, so I can only test my code with synthetic data. That is the reason it appeared as a cube.

[Kaylyn Bellais]

Thank you so much, Star!

That absolutely worked.

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!