Generating Random Numbers

Support
1

Hi,

I want to generate 10 random numbers out of 20 without repeating any of
these numbers. ie. I have numbers 1 to 20 and I want to 10 numbers randomly
from this list.
I have tried using
once(int(1.0 + 20*random()))
with 10 different calculation fields but every so often the numbers overlap.
Any pointers on how I can achieve this?

Kind regards,

Sam

2

Hi Sam,

Martijn (of enketo.org fame) has a good thread on random number
generation at https://groups.google.com/d/msg/formhub-users/ndcyBG3I-og/2IiO0DlDYaEJ.
Try some of the ideas outlined there.

Yaw

ยทยทยท -- Need ODK services? http://nafundi.com provides form design, server setup, professional support, and software development for ODK.

On Sat, Aug 23, 2014 at 4:54 AM, Ruralnet Kalundu ruralnetkalundu@gmail.com wrote:

Hi,

I want to generate 10 random numbers out of 20 without repeating any of
these numbers. ie. I have numbers 1 to 20 and I want to 10 numbers randomly
from this list.
I have tried using
once(int(1.0 + 20*random()))
with 10 different calculation fields but every so often the numbers overlap.
Any pointers on how I can achieve this?

Kind regards,

Sam

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