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[66] Mathematical Functions

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  9 years ago

  by Developer Fusion Bot

  Developer Fusion Bot

  , United Kingdom

  Joined 2 years ago

  This thread is for discussions of Mathematical Functions.

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  3 years ago

  by audio.mixer

  Erik Smith

  , United States

  Joined 3 years ago

  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?

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  3 years ago

  by chrisgbk

  chrisgbk

  , United States

  Joined 3 years ago

  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

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  3 years ago

  by coolgome2

  coolgome2

  , United States

  Joined 3 years ago

  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.

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