How to get the precise time instant of a strobed waveform

Use the functions firstVal or lastVal (they return the first or last x point in a waveform). So for example: lastVal(VT("/N1"))

Andrew 

Hi Andrew,

Thanks for your feedback. 

I need clarify my questions. E.g., there is one segment waveform, from 56s to 60s. The strobe points are defined in this segment. the 1st strobe point time is 56.00418s, the last second strobe point is 59.99998s, the last point is 60s since sim finish at 60s. I would like to pick up points to do fft, e.g, from the last second strobe point backword or from the 1st strobe point forward. 

The firstval or lastval function just give me 56s and 60s as result. They are based on interpolation. What I need is the exact strobe point time. In the example, they are 56.00418s or 59.99998s. 

Is there anyway to implement them?

Thanks for your attention. 

sjwprcker said:

The firstval or lastval function just give me 56s and 60s as result. They are based on interpolation. What I need is the exact strobe point time. In the example, they are 56.00418s or 59.99998s

The firstVal and lastVal functions do not interpolate. My guess (and I do wish people would explain their problem with enough information) is that you are first extracting part of the waveform using clip() and then trying to use firstVal or lastVal on that? Perhaps use clipX() instead as this doesn't interpolate and only gives you actual points, and then you could use firstVal and lastVal.

The last point is always output by the simulator (no interpolation is being performed). If you don't want that point to confuse things, run the transient for very slightly more than 60s and then clipX to the range you want.

Alternatively, if in ADE, use variables to control what you're strobing and when, and then use the same variables in your dft expression (using VAR()).

Overall though, I'm having to do a lot of guessing here as you've not really described your entire setup well. 

Andrew

Hi Andrew,

Thanks for your feedback. Sorry not explain in detail enough for the 1st post. 

Regarding to clipX(), i dont fine it in calculator. Can you point where I can find it?

For now you need to type it in yourself. There's a change request or two asking for it to be, but there's also the idea that it could be consolidated with the existing clip() function. 

Andrew

Hi Andrew,

I got clipX, it is available but not shown in the calculator explictly. 

That is fine. I will try to use it.