Random Cards Not so Random...

[Mokonzi]

I've noticed in the setup of cards I've got, that when I buy a pack for a certain level with the percentage set at 600% , I end up with more of a chance of getting the first card or cards in the set, than the later ones.

A bug in the random calculation?

 

[Deceptor]

Cards themselves can have chances too, if you want to understand how the calculations work you can view the explanation here in the documentation: http://www.dragonbyte-tech.com/content/161-managing-triple-triad-decks

 

[Mokonzi]

That's true, but seemingly the card in question that I keep getting (four out of a five card deck often) is 650% rarity... the next to highest in 23 cards of that level... I'm beginning to wonder if the percentage is working backwards...

 

[Cosmic]

IIRC there are issues if you don't set a rarity for *every* card in the pack.

If you only set the rarity for some then it throws off the equation. Could that be your issue?

 

[Mokonzi]

It might be, not everything has a set rarity. But a lot of cards have a lower rarity (10% as compared to %650), how come they don't end up being picked? Will try setting a minimum rarity on all the cards later.

 

[Deceptor]

Mokonzi - The rarirty will step through each card in ascending order, and if none are found it'll loop back until it finds a card in the random level it's chosen. This is working as designed so cards further down the list are progressively harder to get combined with the % chances. I may implement some other alternartive random algorithms in the future to give users a choice as this method may not be there preference

Beyond that though, computers stink at random

 

[Mokonzi]

Hmmm, in other words, I've got the rarity in reverse order...

I'll take another look at it tomorrow when I've had time to sleep enough to hopefully start thinking logically...

Thanks for the patience.

Edit:

"Ascending order", i.e. 10% is rarer than 600%?

 

[Deceptor]

Yes, 10% is rarer than 600%, the best way to think of it is:

"Your chance of getting this card is 10/1000" (Which is 1/100)
or
"Your chance of getting this card is 600/1000" (Which is 3/5)

 

[Mokonzi]

Cool, that makes sense. I did notice the AdminCP says this about the card rarity:

The card rare value determines how rare a card is by chance. It is designed with the scale 0% - 1000% in mind, where 0% means it's extremely easy to obtain and 1000% means it's extremely rare. You do not need to enter % here, just the number.

You might need to adjust that...

 

[Deceptor]

Right you are, my bad

 

[Mokonzi]

Glad I could spot that for you