doc/info/engineering-format.texi

   1 Engineering-format changes the way maxima outputs floating-point numbers
   2 to the notation engineers are used to: @code{a*10^b} with @code{b} dividable by
   3 three.
   4 @menu
   5 * Functions and Variables for engineering-format::
   6 @end menu
   7
   8 @node Functions and Variables for engineering-format, , engineering-format-pkg, engineering-format-pkg
   9 @section Functions and Variables for engineering-format
  10
  11 @c -----------------------------------------------------------------------------
  12 @anchor{engineering_format_floats}
  13 @defvr {Option variable} engineering_format_floats
  14 Default value: @code{true}
  15
  16
  17 This variable allows to temporarily switch off engineering-format.
  18 @c ===beg===
  19 @c load("engineering-format");
  20 @c float(sin(10)/10000);
  21 @c engineering_format_floats:false$
  22 @c float(sin(10)/10000);
  23 @c ===end===
  24 @example
  25 @group
  26 (%i1) load("engineering-format");
  27 (%o1) /home/gunter/src/maxima-code/share/contrib/engineering-for\
  28 mat.lisp
  29 @end group
  30 @group
  31 (%i2) float(sin(10)/10000);
  32 (%o2)                - 54.40211108893698e-6
  33 @end group
  34 (%i3) engineering_format_floats:false$
  35 @group
  36 (%i4) float(sin(10)/10000);
  37 (%o4)                - 5.440211108893698e-5
  38 @end group
  39 @end example
  40
  41 See also @mref{fpprintprec} and @mrefdot{float}
  42
  43 @opencatbox{Categories:}
  44 @category{Display functions}
  45 @category{Global flags}
  46 @category{Share packages}
  47 @closecatbox
  48 @end defvr
  49
  50 @anchor{engineering_format_min}
  51 @defvr {Option variable} engineering_format_min
  52 Default value: @code{0.0}
  53
  54 The minimum absolute value that isn't automatically converted to the engineering format.
  55 See also @mref{engineering_format_max} and @mrefdot{engineering_format_floats}
  56
  57 @c ===beg===
  58 @c lst: float([.05,.5,5,500,5000,500000]);
  59 @c load("engineering-format");
  60 @c lst;
  61 @c engineering_format_min:.1$
  62 @c engineering_format_max:1000$
  63 @c lst;
  64 @c ===end===
  65 @example
  66 @group
  67 (%i1) lst: float([.05,.5,5,500,5000,500000]);
  68 (%o1)       [0.05, 0.5, 5.0, 500.0, 5000.0, 500000.0]
  69 @end group
  70 @group
  71 (%i2) load("engineering-format");
  72 (%o2) /home/gunter/src/maxima-code/share/contrib/engineering-for\
  73 mat.lisp
  74 @end group
  75 @group
  76 (%i3) lst;
  77 (%o3) [50.0e-3, 500.0e-3, 5.0e+0, 500.0e+0, 5.0e+3, 500.0e+3]
  78 @end group
  79 (%i4) engineering_format_min:.1$
  80 (%i5) engineering_format_max:1000$
  81 @group
  82 (%i6) lst;
  83 (%o6)     [50.0e-3, 0.5, 5.0, 500.0, 5.0e+3, 500.0e+3]
  84 @end group
  85 @end example
  86
  87 @opencatbox{Categories:}
  88 @category{Display functions}
  89 @category{Global flags}
  90 @category{Share packages}
  91 @closecatbox
  92 @end defvr
  93
  94
  95 @anchor{engineering_format_max}
  96 @defvr {Option variable} engineering_format_max
  97 Default value: @code{0.0}
  98
  99 The maximum absolute value that isn't automatically converted to the engineering format.
 100 See also @mref{engineering_format_min} and @mrefdot{engineering_format_floats}
 101
 102 @opencatbox{Categories:}
 103 @category{Display functions}
 104 @category{Global flags}
 105 @category{Share packages}
 106 @closecatbox
 107 @end defvr