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Natural Logarithm

Overview​

This function returns the natural logarithm of a number.

CHelper.Math.Ln(Number)

The parameter of this function can be defined as an XPath, variable, or number.

Considerations​

  • The input parameter must be double.
  • The supported attribute types to use as input XPath parameter (or Xpaths stored in variables) are: integer, currency, float, real.
  • The function returns an error if the input parameter is less than or equal to 0.
  • The function returns an error if the input parameter is either too long or undefined.
  • Use the IsNaN function to validate the parameter is a number.

Example​

A Laboratory uses Bizagi to manage its medical researches. In these researches the laboratory commonly has to perform estimations of bacterial colonies growth. The time a colony spends to achieve an expected growth is estimated using the following expression:

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Where No is the initial population, e is the base of natural logarithms, k is a constant, and N is the population at the t time.

To calculate the time to achieve the expected population of bacterias in Bizagi you can use the Ln function:

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//Obtain the parameters of the formula in variables

No = <LabResearch.Bacteria.InitialPopulation>

N = <LabResearch.Bacteria.Finalpopulation>

k = <LabResearch.Bacteria.Growthconstant>

//Apply the formula to obtain the time to achieve the expected population

<LabResearch.Bacteria.TimeofEstimation> = (CHelper.Math.Ln(N / No) / k);