How to set up precision by default?

Asked Feb 04 '22 at 15:41

Active Feb 04 '22 at 15:41

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I have a table computing many numbers with large precision. Because of this, probably, Mathematica consumes a lot of RAM. Is it possible to restrict the precision in any calculations by default (globally) by n digits?

asked Feb 04 '22 at 15:41

John Taylor

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Seems easier to use SetPrecision on your table inputs instead. Would that not work? – MarcoB Feb 04 '22 at 15:44
Even if you restrict Precision, calculations with machine numbers are still done with the full amount of binary digits. – Daniel Huber Feb 04 '22 at 15:53
@MarcoB : in my case, RAM is consumed during the calculations of table. – John Taylor Feb 04 '22 at 15:53
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@John Could you show a sample of one such calculation then, or an equivalent minimal working example? – MarcoB Feb 04 '22 at 16:07
How big is the array and how much memory is it using? – mikado Feb 05 '22 at 08:23
@mikado : 16.8 billion rows, each having 10 columns. It uses approx 16 Gb of RAM. – John Taylor Feb 05 '22 at 12:16
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@JohnTaylor - that doesn't sound possible. It's less than 1 bit per element of your table. – mikado Feb 05 '22 at 12:26
@mikado : please find the illustrative example in this question: https://mathematica.stackexchange.com/questions/263478/how-to-fix-mathematica-crashing-in-the-following-case – John Taylor Feb 11 '22 at 20:55

How to set up precision by default?

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