removing some data in a 4d plot

Hi every one,

I have a 4d plot and want to make some limitation for the 4th dimention of my graph. For example if the value is higher than 0.9 plot otherwise ignore that point. I am using scatter3(x,y,z,10,teta,'filled') and I attached the sample input file.

I did the limitation using teta(teta>0.9)=[];

And the error I faced is:

Error using scatter3

Color must be one RGB triplet, an m-by-3 matrix of RGB triplets with one color per scatter point, or an m-by-1 vector with one value

per scatter point.

cla
load 4dplot.txt                          
x = 4dplot(:,1);                               
y = 4dplot(:,2);                              
z = 4dplot(:,3);                  
teta = 4dplot(:,4);                    
scatter3(x,y,z,10,teta,'filled')    
ax = gca;
ax.XDir = 'reverse';
view(-31,14)
cb = colorbar;

Answer 1

[DGM]

You have to apply the same operation to all of the vectors.

load 4dplot.txt                          
x = X4dplot(:,1);                               
y = X4dplot(:,2);                              
z = X4dplot(:,3);                  
teta = X4dplot(:,4);  
goodpts = teta <= 0.9;

scatter3(x(goodpts),y(goodpts),z(goodpts),10,teta(goodpts),'filled')    
ax = gca;
ax.XDir = 'reverse';
view(-31,14)
cb = colorbar;

Answer 2

[Chunru]

data = load('4dplot.txt');             
% x = 4dplot(:,1);    % wrong: variable names canno start with number
x = data(:,1);                               
y = data(:,2);                              
z = data(:,3);                  
teta = data(:,4);     

idx = teta >= 0.9;
scatter3(x(idx),y(idx),z(idx),10,teta(idx),'filled')    
ax = gca;
ax.XDir = 'reverse';
view(-31,14)
cb = colorbar;