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The d h (calc-hms-notation
) command controls the display of
HMS (hours-minutes-seconds) forms. It prompts for a string which
consists basically of an “hours” marker, optional punctuation, a
“minutes” marker, more optional punctuation, and a “seconds” marker.
Punctuation is zero or more spaces, commas, or semicolons. The hours
marker is one or more non-punctuation characters. The minutes and
seconds markers must be single non-punctuation characters.
The default HMS format is ‘@ ' "’, producing HMS values of the form ‘23@ 30' 15.75"’. The format ‘deg, ms’ would display this same value as ‘23deg, 30m15.75s’. During numeric entry, the h or o keys are recognized as synonyms for @ regardless of display format. The m and s keys are recognized as synonyms for ' and ", respectively, but only if an @ (or h or o) has already been typed; otherwise, they have their usual meanings (m- prefix and s- prefix). Thus, 5 ", 0 @ 5 ", and 0 h 5 s are some of the ways to enter the quantity “five seconds.” The ' key is recognized as “minutes” only if @ (or h or o) has already been pressed; otherwise it means to switch to algebraic entry.