(Basic Arithmetic, Customizing Calc): Mention
`calc-multiplication-has-precedence'.
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Jay Belanger
parent
8eb17675b9
commit
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3 changed files with 76 additions and 7 deletions
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@ -50,6 +50,40 @@
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* progmodes/vera-mode.el: New file.
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2007-06-19 Jay Belanger <jay.p.belanger@gmail.com>
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* calc/calc.el (calc-multiplication-has-precendence):
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New variable.
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(math-standard-ops,math-standard-ops-p,math-expr-ops):
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New functions.
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(math-expr-opers): Define using math-standard-ops rather than
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math-standard-opers.
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* calc/calc-aent.el (calc-do-calc-eval): Let math-expr-opers
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equal the function math-standard-ops rather than the variable
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math-standard-opers.
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(calc-algebraic-entry): Let math-expr-opers equal
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math-standard-ops or math-expr-ops, as appropriate.
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(math-expr-read-level,math-read-factor): Let math-expr-opers
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equal math-expr-ops.
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* calc/calc-embed.el (calc-embedded-finish-edit):
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Let math-expr-opers equal the function math-standard-ops
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rather than the variable math-standard-opers.
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* calc/calc-ext.el (math-read-plain-expr)
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(math-format-flat-expr-fancy): Let math-expr-opers equal the
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function math-standard-ops rather than the variable
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math-standard-opers.
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* calc/calc-lang.el (calc-set-language,math-read-big-rec):
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Let math-expr-opers equal the function math-standard-ops rather
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than the variable math-standard-opers.
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* calc/calc-prog.el (calc-read-parse-table): Let math-expr-opers
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equal the function math-standard-ops rather than the variable
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math-standard-opers.
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* calc/calc-yank.el (calc-finish-stack-edit): Let math-expr-opers
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equal the function math-standard-ops rather than the variable
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math-standard-opers.
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* calc/calccomp.el (math-compose-expr): Let math-expr-opers equal
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math-expr-ops.
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2007-06-19 Ivan Kanis <apple@kanis.eu>
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* vc-hg.el: New file.
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@ -1,3 +1,8 @@
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2007-06-19 Jay Belanger <jay.p.belanger@gmail.com>
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* calc.texi (Basic Arithmetic, Customizing Calc): Mention
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the variable `calc-multiplication-has-precedence'.
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2007-06-19 Carsten Dominik <dominik@science.uva.nl>
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* org.texi (Tag): Section swapped with node Timestamps.
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@ -15975,9 +15975,28 @@ whereas @w{@samp{[-2 ..@: 3] ^ 2}} is @samp{[0 ..@: 9]}.
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@mindex @null
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@end ignore
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@tindex /
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The @kbd{/} (@code{calc-divide}) command divides two numbers. Note that
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when using algebraic entry, @samp{/} has lower precedence than @samp{*},
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so that @samp{a/b*c} is interpreted as @samp{a/(b*c)}.
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The @kbd{/} (@code{calc-divide}) command divides two numbers.
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When combining multiplication and division in an algebraic formula, it
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is good style to use parentheses to distinguish between possible
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interpretations; the expression @samp{a/b*c} should be written
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@samp{(a/b)*c} or @samp{a/(b*c)}, as appropriate. Without the
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parentheses, Calc will interpret @samp{a/b*c} as @samp{a/(b*c)}, since
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in algebraic entry Calc gives division a lower precedence than
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multiplication. (This is not standard across all computer languages, and
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Calc may change the precedence depending on the language mode being used.
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@xref{Language Modes}.) This default ordering can be changed by setting
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the customizable variable @code{calc-multiplication-has-precedence} to
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@code{nil} (@pxref{Customizing Calc}); this will give division a higher
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precedence than multiplication. Note that Calc's default choice of
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precedence allows @samp{a b / c d} to be used as a shortcut for
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@smallexample
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@group
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a b
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---.
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c d
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@end group
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@end smallexample
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When dividing a scalar @expr{B} by a square matrix @expr{A}, the
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computation performed is @expr{B} times the inverse of @expr{A}. This
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@ -34899,10 +34918,9 @@ See @ref{Graphics}.@*
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The variable @code{calc-gnuplot-name} should be the name of the
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GNUPLOT program (a string). If you have GNUPLOT installed on your
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system but Calc is unable to find it, you may need to set this
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variable. (@pxref{Customizing Calc})
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You may also need to set some Lisp variables to show Calc how to run
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GNUPLOT on your system, see @ref{Devices, ,Graphical Devices} . The default value
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of @code{calc-gnuplot-name} is @code{"gnuplot"}.
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variable. You may also need to set some Lisp variables to show Calc how
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to run GNUPLOT on your system, see @ref{Devices, ,Graphical Devices} .
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The default value of @code{calc-gnuplot-name} is @code{"gnuplot"}.
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@end defvar
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@defvar calc-gnuplot-plot-command
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@ -35158,6 +35176,18 @@ should also be added to @code{calc-embedded-announce-formula-alist}
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and @code{calc-embedded-open-close-plain-alist}.
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@end defvar
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@defvar calc-multiplication-has-precedence
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The variable @code{calc-multiplication-has-precedence} determines
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whether multiplication or division has precedence in algebraic formulas
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in normal language modes. If @code{calc-multiplication-has-precedence}
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is non-@code{nil}, then multiplication has precedence, and so for
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example @samp{a/b*c} will be interpreted as @samp{a/(b*c)}. If
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@code{calc-multiplication-has-precedence} is @code{nil}, then division
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has precedence, and so for example @samp{a/b*c} will be interpreted as
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@samp{(a/b)*c}. The default value of
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@code{calc-multiplication-has-precedence} is @code{t}.
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@end defvar
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@node Reporting Bugs, Summary, Customizing Calc, Top
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@appendix Reporting Bugs
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