Is there an easy way to program a string of unique random numbers?

you would have to check against the original, however you could start with an array containing all 13 numbers the randomly pic from it and at the same time remove it from the array repeating this 12 more times. the best practice is to use randomize and use the smallest increment of time possible as the seed value.

The best way to do this is to make sure that you are not using the number directly, but are instead using it to make a decision that leads to a unique outcome.

For example, let's say you have 13 cards, in a stack. If you use a random number generator to select cards from that stack, you run the risk of selecting a card twice. Not good.

However, if you use the random number generator to split the stack, and take a card above (or below) the split point, then you will never have this problem.

All you need to know is the number of cards 'left' in the stack, and pick a random number (say) between 1 and 10. For the sake of simplicity let's assume that the split point is the middle.

If the random number is greater than 5, we take the card above the split. If it's lower than or equal to 5, we take the card below the split.

And that's really all there is to it! You can, as a refinement, move the split point to a random position, as well, to increase the chances of picking a card appropriately.

Have fun!

Best,

Guy

http://twitter.com/leckyt

http://computerprogramming.suite101.com/

Most random generators are only psuedo random.

There are many techniques. An easy one ( and what I often use ) to generate a psuedo random number is to seed the random generator using the current milli second.

Good luck.

its random man. youll have to check against the previous set, to know whether to generate a new one, if you do not want non-repeating random numbers.

Well, it isn't random if you remove duplicates. But, that is what you need to do. You need to keep track of all the integers you've generated and if you get one that is a duplicate, throw it away and get another one.