Recalculate random()

[nielsY7USN]

How can I recalculate random() values without manually modifying the parameter using random()?

I would have thought that "compute all" would do it but that's not the case.

[g-andresen]

Hi,

Please share a sample file with the naming of the relevant variables

günther

[nielsY7USN]

Example attached.

The two bars are assigned a random length when dimension is added to them and the only way I can make it change, is if I modify the BarLength parameter

[MichaelT_123]

Hi Mr. NielsY7USN,

It seems that random() function receives its seed 'acquired' somehow at the opening of a document which doesn't change during the whole document session. As such the output of the function random() become deterministic, in mathematical notation random()=const.

Who knows, was this intentional on TF360 developers' side or not?

Can random() function be seeded in a more unique/random way (e.g. via the current time)? This is the open question and perhaps TF360 might have their say here.

If you for some reason want to achieve a higher level of randomness in your design ... run it via an external script without reliance of UserParameter's embedded random() function.

Regards

MichaelT

[nielsY7USN]

Randomness is not a problem in my current design.

My problem is that the random value is only updated when I "touch" the parameter using it.

This is annoying, when I have more parameters relying on a random value - then I have to "touch" them all to get them updated - I would have expected them to update when I use the "compute all" function.

For now, I've "solved" it by adding a common, insignificant, parameter that I can "touch". However I think I'll have to dive into scripts to do it the right way...

[MichaelT_123]

Hi Mr. NielsY7USN

... perhaps the recalculation of parameters set is done only when the parameter change is detected. It might be the rational reason for such implementation... but for random() function. I would suggest taking the problem in your own hands writing a simple custom Recalculate script. 

Utilizing userParameter.dependentParameters property and appropriately convoluting random params of interest should do the job in the structural fashion.

Regards

MichaelT

[troyostrander]

Thanks for the example! That was so helpful.