logarithm

[foozhan]

hi all how can i calculate a logarithm with my own base for example log on base 0.52 ?

[abhishekm71]

You can apply the log formula

log x base 0.52 = ln x / ln (0.52) = (log x base 10) / ( log 0.52 base 10 )

[Stewbond]

http://en.wikipedia.org/wiki/List_of_logarithmic_identities

abhishekm71 is correct, Check out the link above and see the Changing the base section.