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Logarithm with a variable base

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Chesus
Chesus 2023-9-2
评论： Voss 2023-9-2
I want to make a logarithm that has a variable as its base, like:
k=2
logk(8)
ans =
3
How can I do that?

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Voss
Voss 2023-9-2 
k=2
log(8)/log(k)

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