How to use a sharp el531p in logs,complex no,ln

Log in base b of value a =log_b(a)=ln(a)/ln(b)=log(a)/log(b)
See the equivalence on the screen capture below

You can calculate the log base 2 of any number x by calculating log(x)/log(2) or equivalently ln(x)/ln(2).

Press
ln . 2 5 / ln 2 = or
log . 2 5 / log 2 =

You can compute the logarithm of x to any base by computing log(x)/log(b) or ln(x)/ln(b). So, press
ln . 2 5 / ln 2 = or
log . 2 5 / log 2 =

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.

Use the equivalent formula log base b of a is equal to [log10(a)]/[log10(b)], you can also use ln(a)/ln(b), the results will always be equivalent

There is no common logarithm function on this calculator. However, you can calculate it easily enough using the natural logarithm function (ln). The log of x is equal to ln(x) / ln(10). In words, calculate the log of a number by calculating its ln then dividing by ln of ten.

you can press the "log" button or the "ln" for logarithmic calculations. the difference is just that "ln" calculates log on base "e".

The natural log is the LN key, located just to the left of the 7 key.

To calculate the common log, use the relationship log(x) = ln(x)/ln(10).

To calculate the natural log of 3, press 3 LN

To calculate the common log of 3, press 3 LN / 1 0 LN =

The natural log is the LN key, located just to the left of the 7 key.

To calculate the common log, use the relationship log(x) = ln(x)/ln(10).

To calculate the natural log of 3, press 3 LN

To calculate the common log of 3, press 3 LN / 1 0 LN =