diff options
Diffstat (limited to 'doc/misc/calc.texi')
| -rw-r--r-- | doc/misc/calc.texi | 44 |
1 files changed, 31 insertions, 13 deletions
diff --git a/doc/misc/calc.texi b/doc/misc/calc.texi index 5dabf5cd314..0bf7833ec34 100644 --- a/doc/misc/calc.texi +++ b/doc/misc/calc.texi @@ -9909,9 +9909,9 @@ listed. @kindex h n The @kbd{h n} or @kbd{h C-n} (@code{calc-view-news}) command displays -the ``news'' or change history of Calc. This is kept in the file -@file{README}, which Calc looks for in the same directory as the Calc -source files. +the ``news'' or change history of Emacs, and jumps to the most recent +portion concerning Calc (if present). For older history, see the file +@file{etc/CALC-NEWS} in the Emacs distribution. @kindex h C-c @kindex h C-d @@ -14122,7 +14122,7 @@ conventions. Like C mode, Pascal mode interprets array brackets and uses a different table of operators. Hexadecimal numbers are entered and displayed with a preceding dollar sign. (Thus the regular meaning of @kbd{$2} during algebraic entry does not work in Pascal mode, though -@kbd{$} (and @kbd{$$}, etc.) not followed by digits works the same as +@kbd{$} (and @kbd{$$}, etc.)@: not followed by digits works the same as always.) No special provisions are made for other non-decimal numbers, vectors, and so on, since there is no universally accepted standard way of handling these in Pascal. @@ -27866,11 +27866,6 @@ acres per meter-second.) Remainder units are expressed in terms of ``fundamental'' units like @samp{m} and @samp{s}, regardless of the input units. -If you want to disallow using inconsistent units, you can set the customizable variable -@code{calc-ensure-consistent-units} to @code{t} (@pxref{Customizing Calc}). In this case, -if you request units which are inconsistent with the original units, you will be warned about -it and no conversion will occur. - One special exception is that if you specify a single unit name, and a compatible unit appears somewhere in the units expression, then that compatible unit will be converted to the new unit and the @@ -27880,6 +27875,12 @@ change the @samp{s} to @samp{ms} to get @samp{9.8e-4 cm/ms^2}. The ``remainder unit'' @samp{cm} is left alone rather than being changed to the base unit @samp{m}. +If you want to disallow using inconsistent units, you can set the +customizable variable @code{calc-ensure-consistent-units} to @code{t} +(@pxref{Customizing Calc}). In this case, if you request units which +are inconsistent with the original units, you will be warned about it +and no conversion will occur. + You can use explicit unit conversion instead of the @kbd{u s} command to gain more control over the units of the result of an expression. For example, given @samp{5 m + 23 mm}, you can type @kbd{u c m} or @@ -27912,10 +27913,16 @@ Composite units are expanded as if by @kbd{a x}, so that If the value on the stack does not contain any units, @kbd{u c} will prompt first for the old units which this value should be considered -to have, then for the new units. Assuming the old and new units you -give are consistent with each other, the result also will not contain -any units. For example, @kbd{@w{u c} cm @key{RET} in @key{RET}} -converts the number 2 on the stack to 5.08. +to have, then for the new units. (If the value on the stack can be +simplified so that it doesn't contain any units, like @samp{ft/in} can +be simplified to 12, then @kbd{u c} will still prompt for both old +units and new units. You can ignore the prompt for old units with +@key{RET}, or turn off the prompt by setting the customizable variable +@code{calc-allow-units-as-numbers} to @code{nil}; +@pxref{Customizing Calc}.) Assuming the old and new units you give are +consistent with each other, the result also will not contain any +units. For example, @kbd{@w{u c} cm @key{RET} in @key{RET}} converts +the number 2 on the stack to 5.08. @kindex u b @pindex calc-base-units @@ -35694,6 +35701,17 @@ have different dimensions. The default value of @code{calc-ensure-consistent-uni is @code{nil}. @end defvar +@defvar calc-allow-units-as-numbers +When converting units, the variable @code{calc-allow-units-as-numbers} +determines whether or not values which can be simplified so that +they don't contain units (such as @samp{ft/in} can be simplified to 12) +can be regarded as not containing units. If +@code{calc-allow-units-as-numbers} is non-@code{nil}, then @kbd{u c} +will prompt for both old units and new units when converting an expression +like @samp{ft/in}, otherwise @kbd{u c} will only prompt for the new units. +The default value of @code{calc-allow-units-as-numbers} is @code{t}. +@end defvar + @defvar calc-undo-length The variable @code{calc-undo-length} determines the number of undo steps that Calc will keep track of when @code{calc-quit} is called. |