On Fri, Nov 8, 2024 at 01:41 AM, <mhx@...> wrote:
Sometimes, waveform compression distorts in a way that is not immediately
expected (a small straight piece in a nicely curved trace). It is a useful option
when file size is really hurting, but nowadays, and in the future, who cares?
Indeed, We frequently needed to remind LTspice users to turn off waveform compression, especially when they run those simulations where it makes a big difference.
I'll also note that Mike Engelhardt abandoned waveform compression in his new QSPICE program.
What bothers me (about Beta version 24.1) is that someone might enable or disable it and not be aware of it, and then that setting "sticks" until they change it back again. That strikes me as undesirable. (But you can't make everyone happy.)
PS: IMHO, compression is a less of a problem than modified trap gone. ...
Interesting, and not what I see. I see many more inquiries about compression artifacts, than those related to Modified Trap. And the ones about waveform compression tend to look more serious.
... The
standard TRAP may not look nice, but it shows the error is oscillating (so when
you see it, it is certainly bad), while modified trap is purely cosmetic and
suggests that the waveform is accurate everywhere and that there are no
discontinuities.
The other thing Modified Trap does, is to suggest that sharp waveform edges have intermediate values. For a long time, I (and others) thought that LTspice made sharp edges have two intermediate points, at about 25% and 75% of the new value, making them appear slightly rounded (S-shaped) instead of sudden or abrupt. It turns out that was entirely due to the Modified Trap post-processing.
Andy
