* calc/calc.el (calc-default-power-reference-level)
(calc-default-field-reference-level): New variables. * calc/calc-units.el (math-standard-units): Add dB and Np. (math-logunits): New variable. (math-extract-logunits, math-logcombine, calcFunc-luplus) (calcFunc-luminus, calc-luplus, calc-luminus, math-logunit-level) (calcFunc-fieldlevel, calcFunc-powerlevel, calc-level): New functions. (math-find-base-units-rec): Add entry for ln(10). * calc/calc-help.el (calc-u-prefix-help): Add logarithmic help. (calc-ul-prefix-help): New function. * calc/calc-ext.el (calc-init-extensions): Autoload new units functions. Add keybindings for new units functions.
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