How do I iterate if I have points from [-20,5,0] to [20,5,0]?

These points are coordinate points xyz and I need to create a function or loop to find velocities in a line starting from [-20,5,0] to [20,5,0]?

s_vector=[-20,5,0]; % line starts

e_vector=[20,5,0]; % line ends

for i=linspace(s_vector(1),e_vector(1))

disp(i)

end

Is there any other way to do this, to account for all xyz components?

Answer 1

[John D'Errico]

First, learn to use MATLAB as a matrix language. That often means not thinking in terms of loops.

s_vector=[-20,5,0]; % line starts
e_vector=[20,5,0]; % line ends

npts = 41; % this will give nice increments, since only x is varying

t = linspace(0,1,npts).';
xyz = s_vector + t*(e_vector - s_vector);

Rather than dump the entire array of points to the screen, I'll just give you the first 5:

xyz(1:5,:)
ans =
   -20     5     0
   -19     5     0
   -18     5     0
   -17     5     0
   -16     5     0

The virtue of this scheme is it works for ANY pair of start and end points, in any number of dimensions.

[Natalie Arroyo-Rivera]

Thank you! This makes sense!

Answer 2

[KSSV]

clc; clear all ;
x1 = -20 ; y1 = 5 ; 
x2 = 20; y2 = 5 ; 

t = linspace(0,1) ; 
x = x1+(x2-x1)*t ;
y = y1+(y2-y1)*t ; 

[Natalie Arroyo-Rivera]

Thank you!