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06-29-2009
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Uniform sampling
Hi My goal is to build a C function that perform a uniform sampling. I mean that I have a big file with a lot of data and I'd like to take just some data samples accordly the uniform distribution. Es. file1: a b c d e f g h i l m n o p q An example would be to flip a coin for each letter and select all letters for which the coin showed the head. I have used the srand() system call, but it is not uniform. Can anyone suggest a way to start? Thanks D ---------- Post updated at 08:00 PM ---------- Previous update was at 06:30 PM ---------- Hi i'm trying in this way: Code:
...... #define RAND_MAX 2 srand(time(NULL)); ....... in the loop p=rand()%RAND_MAX and if the index is greater than 0 grab the letter otherwise leave it. If you have a different suggestion let me know thanks D. |
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