(maxima.info)Functions and Variables for Help
3.2 Functions and Variables for Help
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-- Function: apropos (<string>)
Searches for Maxima names which have <string> appearing anywhere
within them. Thus, 'apropos (exp)' returns a list of all the flags
and functions which have 'exp' as part of their names, such as
'expand', 'exp', and 'exponentialize'. Thus if you can only
remember part of the name of something you can use this command to
find the rest of the name. Similarly, you could say 'apropos
(tr_)' to find a list of many of the switches relating to the
translator, most of which begin with 'tr_'.
'apropos("")' returns a list with all Maxima names.
'apropos' returns the empty list '[]', if no name is found.
Example:
Show all Maxima symbols which have '"gamma"' in the name:
(%i1) apropos("gamma");
(%o1) [%gamma, gamma, gammalim, gamma_expand, gamma_incomplete_lower,
gamma_incomplete, gamma_incomplete_generalized,
gamma_incomplete_regularized, Gamma, log_gamma, makegamma,
prefer_gamma_incomplete, gamma-incomplete,
gamma_incomplete_generalized_regularized]
-- Function: demo (<filename>)
Evaluates Maxima expressions in <filename> and displays the
results. 'demo' pauses after evaluating each expression and
continues after the user enters a carriage return. (If running in
Xmaxima, 'demo' may need to see a semicolon ';' followed by a
carriage return.)
'demo' searches the list of directories 'file_search_demo' to find
'filename'. If the file has the suffix 'dem', the suffix may be
omitted. See also 'file_search'.
'demo' evaluates its argument. 'demo' returns the name of the
demonstration file.
Example:
(%i1) demo ("disol");
batching /home/wfs/maxima/share/simplification/disol.dem
At the _ prompt, type ';' followed by enter to get next demo
(%i2) load("disol")
_
(%i3) exp1 : a (e (g + f) + b (d + c))
(%o3) a (e (g + f) + b (d + c))
_
(%i4) disolate(exp1, a, b, e)
(%t4) d + c
(%t5) g + f
(%o5) a (%t5 e + %t4 b)
_
-- Function: describe
describe (<string>)
describe (<string>, exact)
describe (<string>, inexact)
'describe(<string>)' is equivalent to 'describe(<string>, exact)'.
'describe(<string>, exact)' finds an item with title equal
(case-insensitive) to <string>, if there is any such item.
'describe(<string>, inexact)' finds all documented items which
contain <string> in their titles. If there is more than one such
item, Maxima asks the user to select an item or items to display.
At the interactive prompt, '? foo' (with a space between '?' and
'foo') is equivalent to 'describe("foo", exact)', and '?? foo' is
equivalent to 'describe("foo", inexact)'.
'describe("", inexact)' yields a list of all topics documented in
the on-line manual.
'describe' quotes its argument. 'describe' returns 'true' if some
documentation is found, otherwise 'false'.
See also Note: Documentation.
Example:
(%i1) ?? integ
0: Functions and Variables for Elliptic Integrals
1: Functions and Variables for Integration
2: Introduction to Elliptic Functions and Integrals
3: Introduction to Integration
4: askinteger (Functions and Variables for Simplification)
5: integerp (Functions and Variables for Miscellaneous Options)
6: integer_partitions (Functions and Variables for Sets)
7: integrate (Functions and Variables for Integration)
8: integrate_use_rootsof (Functions and Variables for
Integration)
9: integration_constant_counter (Functions and Variables for
Integration)
10: nonnegintegerp (Functions and Variables for linearalgebra)
Enter space-separated numbers, `all' or `none': 7 8
-- Function: integrate (<expr>, <x>)
-- Function: integrate (<expr>, <x>, <a>, <b>)
Attempts to symbolically compute the integral of <expr> with
respect to <x>. `integrate (<expr>, <x>)' is an indefinite
integral, while `integrate (<expr>, <x>, <a>, <b>)' is a
definite integral, [...]
-- Option variable: integrate_use_rootsof
Default value: `false'
When `integrate_use_rootsof' is `true' and the denominator of
a rational function cannot be factored, `integrate' returns
the integral in a form which is a sum over the roots (not yet
known) of the denominator.
[...]
In this example, items 7 and 8 were selected (output is shortened
as indicated by '[...]'). All or none of the items could have been
selected by entering 'all' or 'none', which can be abbreviated 'a'
or 'n', respectively.
-- Function: example
example (<topic>)
example ()
'example (<topic>)' displays some examples of <topic>, which is a
symbol or a string. To get examples for operators like 'if', 'do',
or 'lambda' the argument must be a string, e.g. 'example ("do")'.
'example' is not case sensitive. Most topics are function names.
'example ()' returns the list of all recognized topics.
The name of the file containing the examples is given by the global
option variable 'manual_demo', which defaults to '"manual.demo"'.
'example' quotes its argument. 'example' returns 'done' unless no
examples are found or there is no argument, in which case 'example'
returns the list of all recognized topics.
Examples:
(%i1) example(append);
(%i2) append([y+x,0,-3.2],[2.5e+20,x])
(%o2) [y + x, 0, - 3.2, 2.5e+20, x]
(%o2) done
(%i3) example("lambda");
(%i4) lambda([x,y,z],x^2+y^2+z^2)
2 2 2
(%o4) lambda([x, y, z], x + y + z )
(%i5) %(1,2,a)
2
(%o5) a + 5
(%i6) 1+2+a
(%o6) a + 3
(%o6) done
-- Option variable: manual_demo
Default value: '"manual.demo"'
'manual_demo' specifies the name of the file containing the
examples for the function 'example'. See 'example'.
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