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3.1 Documentation | ||

3.2 Functions and Variables for Help |

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The Maxima on-line user's manual can be viewed in different forms. From the
Maxima interactive prompt, the user's manual is viewed as plain text by the
`?`

command (i.e., the `describe`

function). The user's manual is
viewed as `info`

hypertext by the `info`

viewer program and as a
web page by any ordinary web browser.

`example`

displays examples for many Maxima functions. For example,

(%i1) example (integrate);

yields

(%i2) test(f):=block([u],u:integrate(f,x),ratsimp(f-diff(u,x))) (%o2) test(f) := block([u], u : integrate(f, x), ratsimp(f - diff(u, x))) (%i3) test(sin(x)) (%o3) 0 (%i4) test(1/(x+1)) (%o4) 0 (%i5) test(1/(x^2+1)) (%o5) 0

and additional output.

Categories: Console interaction

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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_greek, gamma_incomplete, gamma_incomplete_generalized, gamma_incomplete_regularized, Gamma, log_gamma, makegamma, prefer_gamma_incomplete, gamma_incomplete_generalized_regularized]

Categories: Help

__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) _

Categories: Help · Console interaction · File input

__Function:__**describe**

`describe`(`string`)

`describe`(`string`, exact)

`describe`(`string`, inexact)`describe(`

is equivalent to`string`)`describe(`

.`string`, exact)`describe(`

finds an item with title equal (case-insensitive) to`string`, exact)`string`, if there is any such item.`describe(`

finds all documented items which contain`string`, inexact)`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 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.Categories: Help · Console interaction

__Function:__**example**

`example`(`topic`)

`example`()`example (`

displays some examples of`topic`)`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([x+y,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],z^2+y^2+x^2) 2 2 2 (%o4) lambda([x, y, z], z + y + x ) (%i5) %(1,2,a) 2 (%o5) a + 5 (%i6) a+2+1 (%o6) a + 3 (%o6) done

Categories: Help · Console interaction

__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`

.Categories: Help · Global variables

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