UnUnUnium

I am having a problem figuring out something that I feel probably has a quite simple solution, but after a day of screen staring I am going to give in and ask for some help!

Basically, what I want to do is this: I need to know the position of all non-zero members in a list -

Say I had a list that looked like this: [0 5 0 3 6 0 9]

I would want the results to look like this (counting from index zero): [1 3 4 6].

Make sense? I have tried a solution with lobjects 'lfilt' and 'ltrue' but not really getting there. Any suggestions?

I am having a problem figuring out something that I feel probably has a quite simple solution, but after a day of screen staring I am going to give in and ask for some help! 

Basically, what I want to do is this: I need to know the position of all non-zero members in a list - 

Make sense? I have tried a solution with lobjects 'lfilt' and 'ltrue' but not really getting there. Any suggestions?


list-position-query

 to unroll the list and test if the value is non-zero.

I would just use listfunnel to unroll the list and test if the value is non-zero.

here's one way. requires ejies and lobjects..

used your own sword against you, but you still win for using no 3rd party externals..

heh, yes i should have refreshed.. 
used your own sword against you, but you still win for using no 3rd party externals..


Thank you all very much for your help! Both of these solutions work perfectly. I fortunately do have both 3rd party libraries installed.

One question in regards to the solution using list funnel. I'm used to using group with an argument - just to clarify, I think what is happening here is that it is collecting the individual ints representing the "non zero positions", then banging them out as a list when the list has been analsyed - but what happens when a list is longer than 256 members? I am wondering because I am using this to process jitter matrices....

Thank you all very much for your help! Both of these solutions work perfectly. I fortunately do have both 3rd party libraries installed. 

One question in regards to the solution using list funnel. I'm used to using group with an argument - just to clarify, I think what is happening here is that it is collecting the individual ints representing the "non zero positions", then banging them out as a list when the list has been analsyed - but what happens when a list is longer than 256 members? I am wondering because I am using this to process jitter matrices....


Nevermind, I just tested it and it seems to work just fine with longer lists - am I mistaken in the 256 list length limitation, or is there something I am not understanding?

If you want to handle more than 256 elements, you need to specify it to 

 will work up to 2048 items, it doesn't have to be a power of 2... but still that's more impressive 

If you want to handle more than 256 elements, you need to specify it to zl: zl 2048 filter 0 will work up to 2048 items, it doesn't have to be a power of 2... but still that's more impressive 


Ah, I see. I had never known that, thank you! Yes, I only work in powers of two, everything just sounds so much warmer that way ! 

List position query