Alog

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IDL Reference Guide: Procedures and Functions

ALOG

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Syntax | Return Value | Arguments | Keywords | Examples | Version History | See Also

The ALOG function returns the natural logarithm of X.

Alog

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For input of a complex number, Z = X + iY, the complex number can be rewritten as Z = R exp(iq), where R = abs(Z) and q = atan(y,x). The complex natural log is then given by,

alog(Z) = alog(R) + iq

In the above formula, the use of the two-argument arctangent separates the solutions at Y = 0 and takes into account the branch-cut discontinuity along the real axis from -¥ to 0, and ensures that exp(alog(Z)) is equal to Z. For reference, see formulas 4.4.1-3 in Abramowitz, M. and Stegun, I.A., 1964: Handbook of Mathematical Functions (Washington: National Bureau of Standards).

Syntax

Result = ALOG(X)

Alogliptin Benzoate

Return Value

Returns the natural logarithm of X.

Arguments

X

The value for which the natural log is desired. For real input, X should be greater than or equal to zero. If X is double-precision floating or complex, the result is of the same type. All other types are converted to single-precision floating-point and yield floating-point results. If X is an array, the result has the same structure, with each element containing the natural log of the corresponding element of X.

Keywords

Thread Pool Keywords

This routine is written to make use of IDL's thread pool, which can increase execution speed on systems with multiple CPUs. The values stored in the !CPU system variable control whether IDL uses the thread pool for a given computation. In addition, you can use the thread pool keywords TPOOL_MAX_ELTS, TPOOL_MIN_ELTS, and TPOOL_NOTHREAD to override the defaults established by !CPU for a single invocation of this routine. See Thread Pool Keywords for details.

Examples

Find the natural logarithm of 2 and print the result by entering:

Find the complex natural log of sqrt(2) + i sqrt(2) and print the result by entering:

Alogia schizophrenia
Note
The real part of the result is just ALOG(2) and the imaginary part gives the angle (in radians) of the complex number relative to the real axis.
Alog

See the ATAN function for an example of visualizing the complex natural log.

Version History

Alogia Definition

See Also

Alog Urban Dictionary

ALOG10, ATAN

IDL Online Help (June 16, 2005)





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