find elemets of matrix based on logical conditions

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Hamid
Hamid 2022-8-1
评论： Hamid 2022-8-1
Ran in:
Dear MATLAB experts,
I have a matrix and wanted to find elements that meet the condition written as goodpts. I tried find function returns a one column array. I could show want I wanted using scatter3.
Thank you in advance.
points=readtable('points.txt');
points=table2array(points);
x_p=points(:,1);
y_p=points(:,2);
z_p=points(:,3);
t_p=points(:,4);
goodpts= z_p>-5 & z_p<5 & x_p>-20 & x_p<20 & -20<y_p & y_p<20 ;
good_points=find(points(goodpts));
scatter3(x_p(goodpts),y_p(goodpts),z_p(goodpts),2,t_p(goodpts),'filled')
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Stephen23
Stephen23 2022-8-1
"In other words, record what has been shown in the scatter3 graph."
x_shown_in_graph = x_p(goodpts);
y_shown_in_graph = y_p(goodpts);
z_shown_in_graph = z_p(goodpts);

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采纳的回答

KSSV
KSSV 2022-8-1
points=readtable('points.txt');
points=table2array(points);
x_p=points(:,1);
y_p=points(:,2);
z_p=points(:,3);
t_p=points(:,4);
goodpts= z_p>-5 & z_p<5 & x_p>-20 & x_p<20 & -20<y_p & y_p<20 ;
good_points=find(points(goodpts));
x_p_goodpts = x_p(goodpts) ;
y_p_goodpts = y_p(goodpts) ;
z_p_goodpts = z_p(goodpts) ;
t_p_goodpts = t_p(goodpts) ;
scatter3(x_p_goodpts,y_p_goodpts,z_p_goodpts,2,t_p_goodpts,'filled')

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