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Owning Palette: Exponential Functions
Requires: Base Development System
Computes the base e natural logarithm of x.
If x is 0, ln(x) is –. If x is not complex and is less than 0, ln(x) is NaN.
|Note For very small values of x, the Natural Logarithm (Arg +1) function is more accurate than adding 1 to x then using this function.|
The connector pane displays the default data types for this polymorphic function.
|x can be a scalar number, array or cluster of numbers, array of clusters of numbers, and so on.|
|ln(x) is of the same numeric representation as x. When x is of the form x = a + bi, that is, when x is complex, the following equation defines the natural logarithm ln(x): |
ln(x) = ln(|x|) + i arg(x)where arg(x) is the phase of x over the interval . In other words, LabVIEW uses the following equation:
When you wire matrix data as an input to this function, a VI that includes subVIs that work with the matrix data type replaces the function. The resulting VI has the same icon but contains a matrix-specific algorithm. The node remains a VI if you disconnect the matrix from the input(s). Wire other data types as inputs to restore the original function. If you wire a data type to a function and that data type causes a basic math operation to fail, the function returns an empty matrix or NaN.
Refer to the Matrix Logarithm VI for more information.
Refer to the Exponential VI in the labview\examples\Mathematics\Elementary & Special Functions\Exponential Functions directory for an example of using the Natural Logarithm function.