ALOG Corporation is a Small Business specializing in Base Operations Support Services, Maintenance, Transportation, Training, and Supply support for our Nation’s Soldiers, Sailors, Airmen, Marines, and Other Governmental Agencies.

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Why ALOG Corporation?

Alog is built upon default Python logging module. You can configure it by the same way of default Python logging module when it’s needed. Comparing alog with Python default logging module. Comparing alog: In 1: import alog In 2: alog. Info ('Hello alog!' ) 2016-11-23 12: 20: 34 INFO Hello alog! (a)Log is a free Android hamradio (amateur radio) logbook: - callsign lookup (HRDLOG.net and HamQTH) - export ADIF - real-time upload to HRDLOG.net - DX cluster - real-time propagation - real-time worldwide QSO map - GPS utilities (create KMZ - geotagged photo.

With over 40 years of experience in military base support, ALOG Corporation strives to maintain the highest standards in customer satisfaction. Our dedication to quality and outstanding performance is what separates us from competitors. Our clients look to us for leading-edge answers to improve logistics strategies along with other services. With our proven track record of effective operations and exceptional management, we look forward to making your mission a success.

IDL Reference Guide: Procedures and Functions

ALOG

Syntax Return Value Arguments Keywords Examples Version History See Also

The ALOG function returns the natural logarithm of X.

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)

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:

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


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.

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

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Version History

Alog Company

See Also

ALOG10, ATAN

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IDL Online Help (June 16, 2005)

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