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cameronbracken / pgfSweave

Quality graphics and speedy compilation with Sweave
http://r-forge.r-project.org/projects/pgfsweave/
29 stars 6 forks source link

Chunk dependency checking #15

Open cameronbracken opened 13 years ago

cameronbracken commented 13 years ago

Like the weave package

halpo commented 12 years ago

cacheSweave recently added this feature as well. https://github.com/rdpeng/cachesweave/commit/194037747cac7eaedd2e80186eebc82350d059b9#L1L219 I would love to see this in pgfSweave.

yihui commented 12 years ago

maybe I'm asking a stupid question, but I don't understand why we ever need this dependency feature since lazy loading is already used, which means objects are never really loaded unless they are really going to be used, so what extra benefits does this feature give us?

halpo commented 12 years ago

Consider the case I'm dealing with. Chuck 1 generates simulation data. Chuck 2 describes that data. I run it get some results and find that I need to modify one of the parameters. I update chuck 1 and re run. with caching turned on nothing changed in chunk 2 so it does not get updated and those results now reflect the old simulation and not the new simulation. Turning on dependencies allows you to say update this chunk if anything that it depends on changes.

yihui commented 12 years ago

Got it. Thanks a lot!