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What is the opposite of log_expand

asked 2018-01-28 13:13:58 +0100

Harald gravatar image

log_expand does converts log(x*y) to log(x)+log(y). Is there a function which explicitly reverts this?

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answered 2018-01-28 18:20:33 +0100

tmonteil gravatar image

Yes, log_simplify:

sage: e = log(x*y) ; e
sage: f = e.log_expand() ; f
log(x) + log(y)
sage: f.log_simplify()

Note that given an sage object e, you can see all methods that can be applied to it, by typing e.<TAB_BUTTON>, and the methods that start with blah by typing e.blah<TAB_BUTTON>, in particular, you could discover both methods by typing:

sage: e.log<TAB_BUTTON>
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Asked: 2018-01-28 13:13:58 +0100

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Last updated: Jan 28 '18