Plotting this gaussian distribution.

I'm trying to make a list of velocities that come from a gaussian distribution, by the code below. However, I'm not being able to plot it to bring out the gaussian distribution. in the velocity vector, I have nDim=3 (number of dimensions) and number of columns=number of particles.

   vels = zeros(nDim,nPart);
      for part=1:nPart
          vels(:,part) = randGauss(0,velSTD,nDim);
      end

[Star Strider]

Post your code for your randGauss function.