Slow Waveform Concanenation

[ctr26]

Hi All,

 

I have 3 analogue and 2 digital waveforms that I want to repeat multiple times with a delay between them. I could do this programmatically using a while loop during their playback but ideally I'd like to create a waveform as a delay and concatenate them all so that the resultant waveform is the what will be sent. My current solution is to have a pair of for loops inside a larger for loop. The sub for loops concatenate the waveforms with the shift registered waveforms and then with a waveform of my choosing (the delay waveform). Attached is a snippet of code. However, to produce a waveform that has 200 repeats takes around 20 seconds to build. This is not ideal and considering it is just array manipulation I feel like there is a fast way of doing this using the in place operator, but I don't personally know how.

 

Any advice welcome,

 

Thanks,

 

Craig 

[ensegre]

Growing large arrays in loops, which is what you're doing, is slow at any rate, because it involves reallocating and copying at each iteration. I would preallocate the array Y and fill it in the loop with replicas of the basic chunk.