How to extract elements with a fixed interval from a 1D array

[Coq_Rouge · Accepted solution]

---

Cory K wrote:

What would you like to use to determine the spacing?

You can make it variable using a control, or some other value from your block diagram.

See the attached example.

---

Hello C.Clad

I like your Vi but from 8.2 Labview actually has this function.

Decimate (single shot) VI
Owning Palette: Signal Operation VIs

Installed With: Full Development System

Decimates the input sequence X by the decimating factor and the averaging Boolean control

And the to be honest I discovered my self by an accident in Labview 8.6. So yes I did also sleep somewhat in class. The nice thing about this function is that it let choose if you want to just pick out samples or use the average sum between each "down sample" interval  

[HerbMa]

That is what I am looking for. Thanks for everyone's help!

[Cory_K]

---

Coq Rouge wrote:

Hello C.Clad

---

Did you mistakenly call me 'Clad' or was that a running joke from here?

[Coq_Rouge]

---

Cory K wrote:

Did you mistakenly call me 'Clad' or was that a running joke from here?

---

 

I am quite disappointed C. You should know now that I am always 100 serious in this forum. The Labview forum is way to important for pranks and tricks........ 

[cirrusio]

OK, I know this is late but I just stumbled on this thread as I was looking for something similar.  Here is another stab at decimation (homemade).  This VI runs about 4-5x faster than the VI pointed out by Coq.  It doesn't have the ability to select the initial index at which to start decimating, nor does it have bounds checking, but this should be fairly straightforward to implement.  It's similar to Cory's solution but uses the array indexing on the bounds of a for loop to improve performance.

Just thought someone might be interested.

Peace, Matt

[Jörn]

Is there a performance difference to my second solution? I would expect both solutions to have similar performance. However your solution might be faster, because of some implicit coding which is faster than my explicit suggestion.

[Exovede]

Maybe this implementation (if you don't mind the coercition dots) which takes into account the starting index?

[Dennis_Knutson]

Your image is pointing to your hard drive.

The easiest thing to use is the 'Upload or insert an image on the toolbar above.

[Exovede]

Ok thanks...I've done a copy&paste.  The image was showing on my side.  Here's the "real" image:

 

[cirrusio]

Jorn,

The indexing on the bounds of the array is about as fast as the example you provided.  Interestingly enough, adding the routine as a subvi adds considerable overhead.

Peace, Matt