It's very sad that there is no matlab function "npermsk".
Not work for R is long, and k is small.
For example, R = 1:100, k = 2.
@li haitao, the max digital is 9. If length of R great than 10, it is another problem. I think you can submit a problem like this but larger R.
@ Binbin Qi, You're right.
Make the vector [1 2 3 4 5 6 7 8 9 10]
7 segment LED display
Permute diagonal and antidiagonal
Create an n-by-n null matrix and fill with ones certain positions
Find vampire numbers
Rewrite setdiff to account for non-unique values
Points on a Sphere
Breaking Out of the Matrix
Golomb's self-describing sequence (based on Euler 341)
The Hills Are Alive...
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