Unique Random Integer List

Usage r=myrand(a,b)
a and b is the range, for example if we want to generate random integers between 370 and 55780 we call the function :
r=myrand(370,55780)
We can also limit the list as we need. for example if we want only 10 random integers between 370 and 55780 we use:
r10=r(1:10;
It is also useful for scrambling an array randomly.