The TI-86 has two logarithm functions: ln for natural (base-e) and log for common (base-10) logarithms, and there is no way to change those bases. However, the logarithm to any base can be calculated easily. To calculate the logarithm-base-b of x, simply calculate ln(x)/ln(b) or log(x)/log(b)..
The TI 86 has two logarithmic functions: natural logarithm (ln) and common (decimal) logarithms (log). If you need the logarithm in any other base than e or 10 you need to use one of the two equivalent expressions
log_b(x) =ln(x)/ln(b) =log(x)/log(b)
Here b is the value of the base of the logarithm and x is the argument (the value whose logarithm you are seeking). Of course the argument x must be a positive number.
Note: On the TI 86 the log function can calculate the logarithm of a complex number, according to the manual.
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