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Mostly i work with Octave / Matlab but i am trying to get into python also.

Lately i have a couple problems where my numbers can't be represented in binary64 or float64 default format because they exceed the max of 1.8x10^308. Is there a common way people deal with this (without toolkits)?

Similarly i have some problems where i need more than 15 digits of precision after the decimal and sometimes this exceeds the default precision. For example if i specify "precision", 56 on [1/3] the 0.(3) repeating 3s eventualy turn into non-3s which is a digital artifact.

Any suggestions or workarounds to these problems in matlab/octave or python? (Without toolkit$?) I feel like there may be something basic im missing because it seems like this should be straightforward.

Thanks!