Select a random number/kishGrid

Support
1

Hello everyone,

I am new to ODK. Could you please help me to know how to select a random
number out of a total number of the HH members?

In other words, if the total number of the HH members is 7, we want to
select a random number/member out of the 7 members (from 1 to 7), how can
we implement this in XLSForm?

Looking forward to hearing from you.

All the Best,

Ali Helmi

2

Hi Ali,

See https://groups.google.com/d/msg/opendatakit/t-TF7v_LMFs/C3AxEpl9BwAJ

The general approach would be to have a calculated field such as:

once(int(7*random())+1)

This would generate a random number between 1 and 7, inclusive.

Yaw

··· On Tue, Feb 28, 2017 at 9:35 AM, Ali Helmi wrote: > Hello everyone, > > I am new to ODK. Could you please help me to know how to select a random > number out of a total number of the HH members? > > In other words, if the total number of the HH members is 7, we want to > select a random number/member out of the 7 members (from 1 to 7), how can we > implement this in XLSForm? > > Looking forward to hearing from you. > > All the Best, > > Ali Helmi > > -- > -- > Post: opendatakit@googlegroups.com > Unsubscribe: opendatakit+unsubscribe@googlegroups.com > Options: http://groups.google.com/group/opendatakit?hl=en > > --- > You received this message because you are subscribed to the Google Groups > "ODK Community" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to opendatakit+unsubscribe@googlegroups.com. > For more options, visit https://groups.google.com/d/optout.
3

Hi Yaw,

Thank you so much for your help on this.

I have replaced the number 7 in the code

once(int(7*random())+1)

to be the variable name of the total number of members in the HH

once(int(${hh_num}random())+1)
My question now is, what happen if we delete (+1) at the end of the code?
and what does (+1*) do?

All My Best Regards,

Ali

··· On Thursday, March 9, 2017 at 2:39:54 AM UTC+2, Yaw Anokwa wrote: > > Hi Ali, > > See https://groups.google.com/d/msg/opendatakit/t-TF7v_LMFs/C3AxEpl9BwAJ > > The general approach would be to have a calculated field such as: > > once(int(7*random())+1) > > This would generate a random number between 1 and 7, inclusive. > > Yaw > > On Tue, Feb 28, 2017 at 9:35 AM, Ali Helmi <ahel...@gmail.com > wrote: > > Hello everyone, > > > > I am new to ODK. Could you please help me to know how to select a random > > number out of a total number of the HH members? > > > > In other words, if the total number of the HH members is 7, we want to > > select a random number/member out of the 7 members (from 1 to 7), how > can we > > implement this in XLSForm? > > > > Looking forward to hearing from you. > > > > All the Best, > > > > Ali Helmi > > > > -- > > -- > > Post: opend...@googlegroups.com > > Unsubscribe: opendatakit...@googlegroups.com > > Options: http://groups.google.com/group/opendatakit?hl=en > > > > --- > > You received this message because you are subscribed to the Google > Groups > > "ODK Community" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to opendatakit...@googlegroups.com . > > For more options, visit https://groups.google.com/d/optout. >
4

Ali,

See https://opendatakit.github.io/xforms-spec for the definition of
random(). It says "Returns a random number between 0.0 (inclusive) and
1.0 (exclusive)."

So, the +1 moves the range of possible numbers up 1 so you don't get
zero. Try removing it and try it out!

Thanks,

Yaw

··· On Thu, Mar 9, 2017 at 4:05 AM, Ali Helmi wrote: > > Hi Yaw, > > Thank you so much for your help on this. > > I have replaced the number 7 in the code > > once(int(7*random())+1) > > to be the variable name of the total number of members in the HH > > once(int(${hh_num}*random())+1) > > > My question now is, what happen if we delete (+1) at the end of the code? and what does (+1) do? > > > All My Best Regards, > > Ali > > > On Thursday, March 9, 2017 at 2:39:54 AM UTC+2, Yaw Anokwa wrote: >> >> Hi Ali, >> >> See https://groups.google.com/d/msg/opendatakit/t-TF7v_LMFs/C3AxEpl9BwAJ >> >> The general approach would be to have a calculated field such as: >> >> once(int(7*random())+1) >> >> This would generate a random number between 1 and 7, inclusive. >> >> Yaw >> >> On Tue, Feb 28, 2017 at 9:35 AM, Ali Helmi wrote: >> > Hello everyone, >> > >> > I am new to ODK. Could you please help me to know how to select a random >> > number out of a total number of the HH members? >> > >> > In other words, if the total number of the HH members is 7, we want to >> > select a random number/member out of the 7 members (from 1 to 7), how can we >> > implement this in XLSForm? >> > >> > Looking forward to hearing from you. >> > >> > All the Best, >> > >> > Ali Helmi >> > >> > -- >> > -- >> > Post: opend...@googlegroups.com >> > Unsubscribe: opendatakit...@googlegroups.com >> > Options: http://groups.google.com/group/opendatakit?hl=en >> > >> > --- >> > You received this message because you are subscribed to the Google Groups >> > "ODK Community" group. >> > To unsubscribe from this group and stop receiving emails from it, send an >> > email to opendatakit...@googlegroups.com. >> > For more options, visit https://groups.google.com/d/optout. > > -- > -- > Post: opendatakit@googlegroups.com > Unsubscribe: opendatakit+unsubscribe@googlegroups.com > Options: http://groups.google.com/group/opendatakit?hl=en > > --- > You received this message because you are subscribed to the Google Groups "ODK Community" group. > To unsubscribe from this group and stop receiving emails from it, send an email to opendatakit+unsubscribe@googlegroups.com. > For more options, visit https://groups.google.com/d/optout.
1 Like