/[emacs]/emacs/man/calc.texi
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revision 1.31 by jpb, Mon Dec 27 05:11:37 2004 UTC revision 1.32 by jpb, Wed Dec 29 05:32:08 2004 UTC
# Line 11714  or formula.)  A variable's name is norma Line 11714  or formula.)  A variable's name is norma
11714  Calc also allows apostrophes and @code{#} signs in variable names.  Calc also allows apostrophes and @code{#} signs in variable names.
11715  (The Calc variable @code{foo} corresponds to the Emacs Lisp variable  (The Calc variable @code{foo} corresponds to the Emacs Lisp variable
11716  @code{var-foo}, but unless you access the variable from within Emacs  @code{var-foo}, but unless you access the variable from within Emacs
11717  Lisp, you don't need to worry about it.)  Lisp, you don't need to worry about it.  Variable names in algebraic
11718    formulas implicitly have @samp{var-} prefixed to their names.  The
11719    @samp{#} character in variable names used in algebraic formulas
11720    corresponds to a dash @samp{-} in the Lisp variable name.  If the name
11721    contains any dashes, the prefix @samp{var-} is @emph{not} automatically
11722    added.  Thus the two formulas @samp{foo + 1} and @samp{var#foo + 1} both
11723    refer to the same variable.)
11724    
11725  In a command that takes a variable name, you can either type the full  In a command that takes a variable name, you can either type the full
11726  name of a variable, or type a single digit to use one of the special  name of a variable, or type a single digit to use one of the special
# Line 11727  To push a variable itself (as opposed to Line 11733  To push a variable itself (as opposed to
11733  stack, enter its name as an algebraic expression using the apostrophe  stack, enter its name as an algebraic expression using the apostrophe
11734  (@key{'}) key.  (@key{'}) key.
11735    
 xxx  
   Variable names in algebraic formulas implicitly have  
 @samp{var-} prefixed to their names.  The @samp{#} character in variable  
 names used in algebraic formulas corresponds to a dash @samp{-} in the  
 Lisp variable name.  If the name contains any dashes, the prefix @samp{var-}  
 is @emph{not} automatically added.  Thus the two formulas @samp{foo + 1}  
 and @samp{var#foo + 1} both refer to the same variable.  
   
11736  @kindex =  @kindex =
11737  @pindex calc-evaluate  @pindex calc-evaluate
11738  @cindex Evaluation of variables in a formula  @cindex Evaluation of variables in a formula
# Line 11886  an infix operator preferentially (modulo Line 11884  an infix operator preferentially (modulo
11884  need to write @samp{(5%)-2} to get the former interpretation.  need to write @samp{(5%)-2} to get the former interpretation.
11885    
11886  @cindex Function call notation  @cindex Function call notation
11887  A function call is, e.g., @samp{sin(1+x)}.  Function names follow the same  A function call is, e.g., @samp{sin(1+x)}.  (The Calc algebraic function
11888  rules as variable names except that the default prefix @samp{calcFunc-} is  @code{foo} corresponds to the Emacs Lisp function @code{calcFunc-foo},
11889  used (instead of @samp{var-}) for the internal Lisp form.  but unless you access the function from within Emacs Lisp, you don't
11890  Most mathematical Calculator commands like  need to worry about it.)  Most mathematical Calculator commands like
11891  @code{calc-sin} have function equivalents like @code{sin}.  @code{calc-sin} have function equivalents like @code{sin}.
11892  If no Lisp function is defined for a function called by a formula, the  If no Lisp function is defined for a function called by a formula, the
11893  call is left as it is during algebraic manipulation: @samp{f(x+y)} is  call is left as it is during algebraic manipulation: @samp{f(x+y)} is
# Line 30742  command bound to the key.  After @kbd{Z Line 30740  command bound to the key.  After @kbd{Z
30740  key could invoke a command, which in turn calls an algebraic function,  key could invoke a command, which in turn calls an algebraic function,
30741  which might have one or more special display formats.  A single @kbd{Z P}  which might have one or more special display formats.  A single @kbd{Z P}
30742  command will save all of these definitions.  command will save all of these definitions.
30743    To save an algebraic function, type @kbd{'} (the apostrophe)
30744  To save a command or function without its key binding (or if there is  when prompted for a key, and type the function name.  To save a command
30745  no key binding for the command or function), type @kbd{'} (the apostrophe)  without its key binding, type @kbd{M-x} and enter a function name.  (The
30746  when prompted for a key.  Then, type the function name, or backspace  @samp{calc-} prefix will automatically be inserted for you.)
30747  to change the @samp{calcFunc-} prefix to @samp{calc-} and enter a  (If the command you give implies a function, the function will be saved,
30748  command name.  (If the command you give implies a function, the function  and if the function has any display formats, those will be saved, but
30749  will be saved, and if the function has any display formats, those will  not the other way around:  Saving a function will not save any commands
30750  be saved, but not the other way around:  Saving a function will not save  or key bindings associated with the function.)
 any commands or key bindings associated with the function.)  
30751    
30752  @kindex Z E  @kindex Z E
30753  @pindex calc-user-define-edit  @pindex calc-user-define-edit
# Line 31190  If you want to give the formula a long-s Line 31187  If you want to give the formula a long-s
31187  @kbd{Z F @key{RET} spam @key{RET}} defines the new command as  @kbd{Z F @key{RET} spam @key{RET}} defines the new command as
31188  @kbd{M-x calc-spam}, with no keyboard equivalent.  @kbd{M-x calc-spam}, with no keyboard equivalent.
31189    
31190  The third prompt is for a function name.  The default is to use the same  The third prompt is for an algebraic function name.  The default is to
31191  name as the command name but with @samp{calcFunc-} in place of  use the same name as the command name but without the @samp{calc-}
31192  @samp{calc-}.  This is the name you will use if you want to enter your  prefix.  (If this is of the form @samp{User-m}, the hyphen is removed so
31193    it won't be taken for a minus sign in algebraic formulas.)
31194    This is the name you will use if you want to enter your
31195  new function in an algebraic formula.  Suppose we enter @kbd{yow @key{RET}}.  new function in an algebraic formula.  Suppose we enter @kbd{yow @key{RET}}.
31196  Then the new function can be invoked by pushing two numbers on the  Then the new function can be invoked by pushing two numbers on the
31197  stack and typing @kbd{z m} or @kbd{x spam}, or by entering the algebraic  stack and typing @kbd{z m} or @kbd{x spam}, or by entering the algebraic

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