This thread is for discussions of Mathematical Functions.

I am consistently getting problems with VB's logarithm function. In fact, on my TI-89, log(1.31) returns 0.11727..., not the number you gave, not 0.27... I am trying to write a program to calculate gain changes in microphones, given by the formula 20 * log(old distance / new distance) and the program is returning the wrong values. Any suggestions?

the VB log function is the natural logarithm (base e), not a base 10 logarithm. the help files/MSDN have samples for making a base10 logarithm function... its something like:

log(number)/log(e), where e is a special constant

If you're using the TI-89, the ln(x) function is the same as VB's log(x) function. If you want to use the ti-89's log(x) function in VB, you have to do log(x)/log(10). You should get the right answer.

if ur gettin incorrect ln() output then switch to radian mode or vice versa, which ever you are expecting.

Thanks for your advice.