Autodesk AUTOCAD 2006, Справочник по командам, Страница: 215 / 1490

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5’-9-1/2” or 5’ 9-1/2” or 5’9-1/2”
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5’-9 1/2” or 5’ 9 1/2” or 5’9 1/2”
To designate inches for linear calculations, entering double quotes (“) is
optional. For example, instead of entering 5’9-1/2”, you could enter 5’9-1/2.
WARNING With imperial units, CAL interprets a minus or a dash (-) as a unit
separator rather than a subtraction operation. To specify subtraction, include at
least one space before or after the minus sign. For example, to subtract 9” from
5’, enter 5’ -9” rather than 5’-9”.
Format Angles
The default units for angles are decimal degrees. Enter angles using the
following format:
<degrees> d <minutes> ’ <seconds> ”
You must enter 0d when entering an angle that is less than 1 degree (minutes
and seconds only). You can omit the minutes or seconds if they are zero.
Enter a number followed by r to enter angles in radians. Enter a number
followed by g to enter angles in grads.
The following examples show ways of entering angles:
5d10'20"
0d10'20"
124.6r
14g
Angles entered in any format are converted to decimal degrees.
Pi radians is equal to 180 degrees, and 100 grads is equal to 90 degrees.
Use Points and Vectors
Both points and vectors are pairs or triples of real numbers. A point defines a
location in space, but a vector defines a direction (or translation) in space.
Some CAL functions, such as pld and plt , return a point. Other functions,
such as nor and vec , return a vector.
Format Angles | 191