poissrnd function issue: weird histogram

I tried to produce 10^6 poisson distributed random numbers and when i looked at the histogram, it had either some gaps or shoots depending upon the bin size... can anyone exlpain whats happening here?

     t = zeros(1000000,1);

     for i = 1:1000000
     t(i,1) = poissrnd(100);
     end

     hist(t,300)

Answer 1

[José-Luis]

The loop is unnecessary:

 histogram(poissrnd(100,1e6,1),300)

Works as expected.

[Saurabh Talele]

Thanks a lot :) however, i am still curious about what happens in the stated case.