Trying to get all results from a for loop into an array

I researched how others did it on this forum, but what I could get to work fills the first cell of the array with []. I am just wondering how to try and get the starting position into the first cell. It could also have something to do with the if function .... I don't know enough to try and help!

Any advice on making my code neater would be amazing as well, I am very new to all of this!

The stuff in bold is inside my for loop, and is the bit that I am trying to get to work.

clc

clear

close all

format long G

% Given variables

xpos = 4.000; % Initial x position

ypos = 0.000; % Initial y position

t = [0.00,0.04,0.08,0.12];

xvel = [0.0000,-0.2478,-0.4943,-0.7384]; % x velocities

yvel = [4.0000, 3.9915, 3.9659, 3.9234]; % y velocities

count = 0;

% Find the position of x and y using the velocities

for a = 1:length(t)

count = count + 1 ;

if count-1 <= 0

continue

end

xpos = xvel(count).*(t(count) - t(count-1)) + xpos ;

xposa{a} = xpos;

ypos = yvel(count).*(t(count) - t(count-1)) + ypos ;

yposa{a} = ypos;

end

disp(xposa);

disp(yposa);

Thanks,

Ted Baker

Answer 1

[KSSV]

clc
clear
close all
format long G
% Given variables
xpos = 4.000;           % Initial x position
ypos = 0.000;              % Initial y position
t = [0.00,0.04,0.08,0.12];
xvel = [0.0000,-0.2478,-0.4943,-0.7384];                 % x velocities
yvel = [4.0000, 3.9915, 3.9659, 3.9234];                 % y velocities

% Find the position of x and y using the velocities
for a = 1:length(t)-1
  
  xpos = xvel(a).*(t(a) - t(a+1)) + xpos ;
  xposa{a} = xpos;
  ypos = yvel(a).*(t(a) - t(a+1)) + ypos ;
  yposa{a} = ypos;
end
disp(xposa);
disp(yposa);

[Ted Baker]

Hey KSSV,

That didn't end up working as it gives me the wrong values. I tried changing it to

for a = 1:length(t)

xpos = xvel(a).*(t(a+1) - t(a)) + xpos ;

But then I came across the same issue apart from it did not give me the last value.

Thanks anyway.

Ted