Mat,
 Do you mean something like this

\define pseudo-rand(beta, alpha:1)
<$set name=seed value=<<now "XXX">> >
<$list
filter="[<__beta__>subtract<__alpha__>multiply<seed>divide[999]add<__alpha__>round[]]"
variable=prand>
<<prand>>
</$list>
</$set>
\end


<<pseudo-rand beta:10>>

If we linearly map [0, 999] into [alpha:1, beta:n] where alpha is the first
tiddler and beta is the number of tiddlers to be used for random display!
from mathematics we have

x in [0, 999] (this will be generated by now macro)
y in [alpha, beta] (this is the number we like)

then y= (beta - alpha) / 999  + alpha

In our case if assume number of tiddlers tagged say with myTag is n like
100 then

<<pseudo-rand beta:100>>

n can be calculated values for example from count filter operator.




Best wishes
Mohammad


On Wed, Sep 11, 2019 at 10:50 PM Mat <[email protected]> wrote:

> Seems you've solved your needs but I'd think
>
> <<now "xxx">>
>
> should probably be enough in many cases. It's more or less a random number
> between 0 and 999.
>
> If we had a modulo operator I think it should be simple to convert it to a
> random number in any other range. I tried to extract the last digit but a
> few quick attempts failed - suggestions anyone?
>
> <:-)
>
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