I'm trying to program a patch patch that does sample by sample calculations on a 20 minute audio file, which ends up using some pretty big numbers toward the middle/end of the file (as the file has 50 million or so samples).

I'm using an until object, int object and (+) object to advance sample by sample, but the function is maxing out at "1.67772e+07" samples for some reason. It doesn't seem like any of these objects alone have a number size that would create this limit, but when they're used together like this my 'counter' stops at "1.67772e+07".

I've attached a test/demo patch. Any ideas? test.pd

@bklindgren Slice and dice maybe.....?
I built this truly awful patch years ago in Extended.........https://forum.pdpatchrepo.info/topic/10643/open-a-big-stereo-wave-file-in-a-array-table-4000000-samples/2 and chose to slice the sample into chunks of 1.682e+007 which was nearly the maximum array size in 32-bit Pd.
Anyway, maybe cutting the sample into chunks of less than 1.67772e+07 will solve your problem?
David.

@bklindgren you're running into 32-bit representation issues. a 32-bit number only has 24 bits of representation (the "significand") that is multiplied by 2 to some exponent. So after you store 2^24, or 16777216, you can no longer add one to it since the "ones" place isn't present in the number representation. (because the significand now goes from 2^1 to 2^24).
you can explore that here: https://www.h-schmidt.net/FloatConverter/IEEE754.html
(try entering 16777217 - it is not possible to represent. "Value actually stored in float" is still 16777216)

afaict your options are to:

1. use the right inlet of [tabread4~] somehow
2. use the iem_dp library to do the same thing but with its version of [tabread] and [+ ] (probably easier than writing your own) https://git.iem.at/pd/iem_dp
3. use david's suggestion of breaking up the sample somehow so that it is in chunks < 2^24

or, if you can skip samples then instead of adding 1 add 2 when you get to 2^24. when you hit the next power of 2 add four, etc

@bklindgren If you are processing samples sequentially (i.e. never backing up) you could load each block of the file using [switch~] and [readsf~], e.g. https://forum.pdpatchrepo.info/topic/13518/readsf-varispeed/5. It's a little hard to understand, so let me know if you need further details.

thank you all for the replies! some great info here - going to dive in with this information. thank you all again