Help:ParserFunctions: Difference between revisions

Revision as of 09:37, 27 August 2008

Revision as of 09:37, 27 August 2008

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==Functions==

[Die Quadrolehre]

The extension defines ten functions:

Die Quadrolehre hat als Kernwissenschaft die Lehre von Immanuel Kandt, zur Ursache und Wirkung von Prozessen bzw. Handlungen.

<tt>[[#.23expr:|expr]]</tt>,

Die Ursache ist die von Max Planck entwickelten

<tt>[[#.23if:|if]]</tt>,

"Planckschen Wirkungskonstante der Lichtwelle h"

<tt>[[#.23ifeq:|ifeq]]</tt>,

( beachte den scheinbaren Widerspruch Wirkungskonstante= Ursache)

<tt>[[#.23ifexist:|ifexist]]</tt>,

Die Wirkung ist Natur, die sich nach der Quadrolehre in Zweiersystemen darstellt.

<tt>[[#.23ifexpr:|ifexpr]]</tt>,

Das ergibt die Universialformel

<tt>[[#.23iferror:|iferror]]</tt>,

<tt>[[#.23switch:|switch]]</tt>,

<tt>[[#.23time:|time]]</tt>,

<tt>[[#.23rel2abs:|rel2abs]]</tt>, and

<tt>[[#.23titleparts:|titleparts]]</tt>.

h / M // h³ / M³

<h3 style="background: beige">#expr:</h3>

/= Pfeil nach rechts.

* syntax: {{ft|#expr|expression}}

Es bedeutet:

h= Ursache

M= Molekül

hoch 2 bzw das vielfache von 2

The <tt>expr</tt> function computes mathematical expressions based on permutations of numbers (or [[variable]]s/[[parameter]]s that translate to numbers) and operators. It does not recognize strings (use <tt>[[#.23ifeq:|ifeq]]</tt> below instead). The accuracy and format of numeric results varies with the server's operating system.

Operators are listed below. In a complex expression, operators are evaluated from left to right with the following precedence (explained in more detail in [[Help:Calculation]]):

--////

# grouping (parentheses);

# unary (+/- signs and NOT);

# multiplicative (*, /, div, mod);

# additive (+ and -);

# round;

# comparative (=, !=, &lt;, &gt;, etc.);

# logical AND;

# logical OR.

When evaluating as boolean, "0" is considered false and any other non-space value is true (boolean true is represented as "{{#expr: 30 and 7}}").

Decimal numbers use "." as a decimal point (<code>[[Help:Magic words#Formatting|formatnum:]]</code> can be used to change the decimal point to a comma for the appropriate locales). Scientific notation with <tt>E</tt> plus exponent is '''meanwhile''' supported also on input for expressions (see [[Help:Calculation]]).

{| class="prettytable"

! Operator

! Operation

! Example

! Result

|-

| rowspan="2" colspan="2" align="center"| ''none''

| {{ft|#expr|123456789012345}}

| {{#expr:123456789012345}}

|-

| {{ft|#expr|0.000001}}

| {{#expr:0.000001}}

|-

!colspan="4"| Arithmetic

|-

! +

| Unary positive sign

| {{ft|#expr|+30 * +7}}

| {{#expr:+30 * +7}}

|-

!-

| Unary negative sign

| {{ft|#expr|-30 * -7}}

| {{#expr:-30 * -7}}

|-

! *

| Multiplication

| {{ft|#expr|30 * 7}}

| {{#expr:30 * 7}}

|-

! /<br />div

| Division

| {{ft|#expr|30 / 7}}<br />{{ft|#expr|30 div 7}}

| {{#expr:30 / 7}}<br />{{#expr:30 div 7}}

|-

! <tt>+</tt>

| Addition

| {{ft|#expr|30 + 7}}

| {{#expr:30 + 7}}

|-

! <tt>-</tt>

| Subtraction

| {{ft|#expr|30 - 7}}

| {{#expr:30 - 7}}

|-

!colspan="4"| Logic

|-

! not

| Unary NOT<br />logical NOT

| {{ft|#expr|not 0 * 7}}<br />{{ft|#expr|not 30 + 7}}

| {{#expr: not 0 * 7}}<br />{{#expr:not 30+7}}

|-

! and

| Logical AND

|

{{ft|#expr|4 &lt; 5 and 4 mod 2}}

|{{#expr: 4<5 and 4 mod 2}}

|-

! or

| Logical OR

|

{{ft|#expr|4 &lt; 5 or 4 mod 2}}

|{{#expr: 4<5 or 4 mod 2}}

|-

!colspan="4"| Comparison

|-

! =

| Equality (numerical & logical)

| {{ft|#expr|<nowiki>30 = 7</nowiki>}}

| {{#expr:30 = 7}}

|-

! &lt;&gt;<br />!=

| Inequality, logical exclusive or

| {{ft|#expr|30 &lt;&gt; 7}}<br />{{ft|#expr|<nowiki>1 != 0</nowiki>}}

| {{#expr:30 <> 7}}<br />{{#expr:1 != 0}}

|-

! &lt;

| Less than

|

{{ft|#expr|30 &lt; 7}}

|{{#expr: 30 < 7}}

|-

! &gt;

| Greater than

|

{{ft|#expr|30 &gt; 7}}

|{{#expr: 30 > 7}}

|-

! &lt;=

| Less than or equal to

|

{{ft|#expr|<nowiki>30 &lt;= 7</nowiki>}}

|{{#expr: 30 <= 7}}

|-

! &gt;=

| Greater than or equal to

|

{{ft|#expr|<nowiki>30 &gt;= 7</nowiki>}}

|{{#expr: 30 >= 7}}

|-

!colspan="4"| Other

|-

! ( )

| Grouping operators

| {{ft|#expr|(30 + 7) * 7 }}

| {{#expr:(30 + 7) * 7 }}

|-

! mod

| "Modulo" truncates the numbers to whole numbers, divides the left number by the right, and returns the remainder that could not be divided.<br />Note: ''div'' and ''mod'' are different from all programming languages.

| {{ft|#expr|30 mod 7}}<br />{{ft|#expr|-8 mod -3}}<br />{{ft|#expr|8 mod 2.7}}<br />

| {{#expr:30 mod 7}}<br />{{#expr:-8 mod -3}}<br />{{#expr:8 mod 2.7}}<br />

|-

! round

| Rounds off the number on the left to the power of 1/10 given on the right.