I've been recently working on projects for the TI84 PSE, and I had this interesting idea for a particle engine written in basic. Right now, it uses 4 lists, and detects when a particle goes off the edge of the screen. What I was originally going to have it do was delete the particle when it goes off the edge of the screen, but I'm not sure how I would accomplish this. Is there a quick way of deleting an element of a list I don't know off (I don't want to use For Loops)? If not, I had some ideas, but anyway...

You can use this code snippet to remove the element at position/index X of L1:

Code:

This basically gets dim(L1)-1 elements from L1, starting at index 1, 2, 3... etc, but when it reaches index X, it increments the index, so if X=2, it gets the index 1, 3, 4... etc, which is IIRC what you are looking for

EDIT: even better:

Code:

It might be better to just put an invalid number for the particle, which would render it permanently off-screen and not soo recoverable. Let's say something like E98->L1(n. It is not elegant, but smaller and faster, and effectively renders the particle out. (I doubt you can add or subtract 99 digit number there, or accumulate it during run time...).

The reason I'm trying not to do that is
A. If I simply move it off screen, it has a limited number of particles it can use (999) and moving it off screen would increase the number unnecessarily.

B. I'm using the PXL commands right now, as they're faster. If I switch to the point commands, it would be feasable, but anyway...