getting the number of points in a waveform, or the number of events...

Hi Mark,

> I want the number of time points.  Is there a way to get this?

I have used the cross() function but with the "cycle" argument in lieu of "time". I then determine the length of the vector. I've attached a sample of the code below.

zcross_hsclki = cross(hsclki_clipped 0 0 "rising" t "cycle")

xvector = drGetWaveformXVec(zcross_hsclki)

xvector_length = drVectorLength(xvector)

printf("Vector phase length = %d.\n" xvector_length)

This might do what you want - assuming I understand your intent Mark!

Shawn

Actually this can be done more simply:

overCurrentXingsInClip1=length(cross(clip(VT("/fb_top1/I_buck_nonlinear/I0/overcurrent_det")  20u 40u ) 1.8/2 0 "rising"  t "time"  ))

The cross function can return a list of crossings if 0 is given as the edge number. Most calculator functions don't deal with lists, so we can use the SKILL length() function to measure the number of entries in the list.

Regards,

Andrew.

Andrew, 

I cut and pasted your code, and got this error message:

ocean> overCurrentXingsInClip1=length(cross(clip(VT("/fb_top1/I_buck_nonlinear/I0/overcurrent_det") 20u 40u ) 1.8/2 0 "rising" t "time" ))
*Error* length: argument must be a list or an array - srrWave:0x213cb080
ocean>

Mark

Hi Mark,

Sorry, I didn't try your code, and so didn't notice that you had the "multiple occurrence" option set. Rather perversely, you need to have it set to "single occurrence" (which corresponds to having the last two arguments to the cross() function set to nil), and then it should work.

The multiple occurrence feature was added at some point later, and will generate a waveform with all the crossing points - which would require you to use an approach similar to Shawn's suggestion, but if you use the older "single occurrence" capability, you can set the edge number to 0 and get a list of the crossings (which is normally not useful in the calculator because it can't deal with SKILL lists of stuff).

So that should be:

overCurrentXingsInClip1=length(cross(clip(VT("/fb_top1/I_buck_nonlinear/I0/overcurrent_det")  20u 40u ) 1.8/2 0 "rising" nil nil  ))

Hopefully that will work for you!

Regards,

Andrew.

Unknown said:

Shawn, thanks! That works... I'd still like to know if Andrew's approach can be made to work , if possible.

Hopefully you can try my new suggestion - maybe you'd not seen that when you replied?

Great Mark! 

Thank you for letting me know!

I'm also going to keep Andrew's suggestion in my back pocket as it seems more efficient.

Shawn

Hi Andrew

I have tried it out, it works.

Besides, I take the concept from your "movingAvg", to make a moving version of counting the crossing point within a moving time window across the simulation time.

the user application can be: counting the glitches before/after transition. And there is no need to specify when the transition happens.

And it allows multiple transitions during the simulation.

Best Regards

Yi