title: Is there a possibility to have a quiver plot with vectors of same length?
body: <p>I am using a quiver plot in MATLAB to simulate a velocity field. Now I would like the vectors produced by the quiver plot to be all the same length, so that they just indicate the vectors direction. The value of the velocity in each point should be illustrated by different colors then.
  Is there a possibility to have quiver plotting vectors of same length?</p>
  <p>That's my current code:</p>
  <pre><code>%defining parameters:
  age = 900;
  vis= 15;
  
  turbulences = zeros(9,3);
  a = 0.01;
  spacing = 1000;
  [x,y] = meshgrid(-100000:spacing:100000);%, 0:spacing:10000);
  u = a;
  v = 0;
  
  n = 0;
  for i = 1:4
      turbulences(i,1) = -80000 + n;
      turbulences(i,2) = 15000;
      n = 15000 * i; 
  end
  
  n = 0;
  for i = 5:9
      turbulences(i,1) = -15000 + n*5000;
      turbulences(i,2) = 4000;
      n = n+1;
  end
  
  for i = 1:4
      turbulences(i,3) = -1000;
  end
  for i = 5:9
      turbulences(i,3) = 800;
  end
  
  %compute velocities in x and y direction 
  for k = 1:9
      xc = turbulences(k,1);
      yc = turbulences(k,2);
      r1 = ((x-xc).^2 + (y-yc).^2);
      r2 = ((x-xc).^2 + (y+yc).^2);
      u = u + turbulences(k,3)/2*pi * (((y-yc)./r1).*(1-exp(-(r1./(4*vis*age)))) - ((y+yc)./r2).*(1-exp(-(r2./(4*vis*age)))));
      v = v - turbulences(k,3)/2*pi* (((x-xc)./r1).*(1-exp(-(r1./(4*vis*age)))) - ((x-xc)./r2).*(1-exp(-(r2./(4*vis*age)))));
  end
  
  quiver(x,y,u,v);
  grid on;
  </code></pre>
  <p>Thank you for your help!</p>