MATLAB: How to delete previous values recorded

loopprojectile motionrecorded valuestrajectory

hello, it would be of great help if anybody could tell me how to delete previous values recorded by matlab once my loop has reached the value that i needed it to, therefore having a new set of values, because my program is just recording all the values, inclusive the non-desired values and then plotting them, this way reducing accuracy in the graph visual because it is must larger and over a large space of time. thanks in advance luis

Best Answer

It is not perfectly clear to me what you mean. You might want to show us some code. However, here is a guess at what you want:

Suppose you have a vector A of length 102, and you only want to keep the first 100 elements. Each of the following methods would work:

A = A(1:100);

A(101:102) = [];

A(end-1:end) = [];

Related Solutions

MATLAB: Projectile motion with drag:

As you have written your code, you need to subscript all your vectors:

while i<n
  ax(i)=-(D/m)*v(i).*vx(i);
  ay(i)=-g-(D/m)*v(i).*vy(i);
  vx(i+1)=vx(i)+ax(i)*dt;
  vy(i+1)=vy(i)+ay(i)*dt;
  xdisp(i+1)=xdisp(i)+vx(i)*dt+0.5*ax(i)*dt^2;
  ydisp(i+1)=ydisp(i)+vy(i)*dt+0.5*ay(i)*dt^2;
  t(i+1)=t(i)+dt;
  v(i+1) = sqrt(vx(i).^2 + vy(i).^2);
  i=i+1;
end

I cannot figure out what you want to plot. I leave that for you to sort.

MATLAB: How to ‘streamline’ this code

 The code works exactly how I want it to

Then it is ready. Test is exhaustively. If it works, trying to make it smarter means to take the chance to insert bugs.

I'm coming from the field of numerics and would solve this without symbolic calculations. But this is just a different approach.

The comments are good. It is always clear what the intention of the code is.

You find vivid discussions in the net about using square brackets around units.

Best Answer

Related Solutions

MATLAB: Projectile motion with drag:

MATLAB: How to ‘streamline’ this code

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