Template:Floor: Difference between revisions

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Template>Erik Baas
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<includeonly>{{#ifexpr:({{{1}}})=(({{{1}}})round 0)|{{#expr:{{{1}}}}}|{{#ifexpr:({{{1}}})>0|{{#expr:((({{{1}}})+0.5)round 0)-1}}|{{#expr:-((0.5-({{{1}}}))round 0)}}}}}}</includeonly><noinclude>{{Template documentation}}
<span style="font-size:{{{2|1em}}}">⌊</span>{{{1}}}<span style="font-size:{{{2|1em}}}">⌋</span><noinclude>{{Documentation|content=
Implements the mathematical [[floor function]], i.e. returns the input value if it is an integer, otherwise returns the largest integer below the input value.
== Description ==
Displays the parameter wrapped in floor symbols. This template is for display, not calculation.


For negative numbers, the decimals will be simply dropped. For positive numbers, it will also truncate the displayed decimals but the integer part of the absolute value displayed is incremented. This is the mathematical definition of the IEEE rounding mode ''toward plus infinite''.
== Examples ==
{{demo|<nowiki>{{floor|45.23}}</nowiki>}}
{{demo|<nowiki>{{floor|''x''}}</nowiki>}}
{{demo|<nowiki>{{floor|{{sfrac|2''a''|''b''}}}}</nowiki>}}
{{demo|<nowiki>{{floor|{{sfrac|2''a''|''b''}}|2em}}</nowiki>}}
{{demo|<nowiki>{{floor|{{sfrac|2''a''|''b''}}|larger}}</nowiki>}}
{{demo|<nowiki>{{floor|{{sfrac|2''a''|''b''}}|large}}</nowiki>}}
{{demo|<nowiki>{{math|{{floor|{{sfrac|2''a''|''b''}}}}}}</nowiki>}}
{{demo|<nowiki>{{bigmath|{{floor|{{sfrac|2''a''|''b''}}}}}}</nowiki>}}


; Usage<nowiki>:</nowiki>
== See also ==
: <tt><nowiki>{{</nowiki>{{PAGENAME}}|</tt>''value''<tt><nowiki>}}</nowiki></tt>
{{Math templates|notation}}


; Examples<nowiki>:</nowiki>
[[Category:Mathematical formatting templates]]
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>3.9<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|3.9}}.
}}</noinclude>
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>3.5<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|3.5}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>3.1<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|3.1}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>3.0<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|3.0}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>1.0<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|1.0}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>0.9<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|0.9}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>0.5<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|0.5}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>0.1<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|0.1}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>0.0<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|0.0}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-0.1<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-0.1}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-0.5<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-0.5}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-0.9<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-0.9}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-1.0<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-1.0}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-3.0<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-3.0}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-3.2<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-3.2}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-3.5<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-3.5}}.
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-3.9<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-3.9}}.
 
; Known bug (should appear extremely rarely as this goes beyond the precision of math performed in pages using this template)
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>0.99999999999999983<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|0.99999999999999983}} (OK).
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>0.99999999999999984<nowiki>}}</nowiki></tt> = <span style="color:red">{{{{PAGENAME}}|0.99999999999999984}}</span> (wrong but comes from limited floating point precision, the input is 1-''epsilon'', adding 0.5 yields 1.5-''epsilon'' which rounds to 2 exactly, then subtracting 1 gives 1 exactly).
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>0.99999999999999999<nowiki>}}</nowiki></tt> = <span style="color:red">{{{{PAGENAME}}|0.99999999999999999}}</span> (wrong but comes from limited floating point precision, the input is considered equal to the exact integer 1).
 
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-0.99999999999999983<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-0.99999999999999983}} (OK).
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-0.99999999999999984<nowiki>}}</nowiki></tt> = <span style="color:red">{{{{PAGENAME}}|-0.99999999999999984}}</span> (wrong but comes from limited floating point precision, the input is not exactly equal to the integer -1, but subtracting 0.5 yields -1.5 exactly due to precision limits, which then rounds to -2).
* <tt><nowiki>{{</nowiki>{{PAGENAME}}<nowiki>|</nowiki>-0.99999999999999999<nowiki>}}</nowiki></tt> = {{{{PAGENAME}}|-0.99999999999999999}} (OK, the input is considered equal to the exact integer -1, so this exact -1 integer is returned).
{| class="prettytable" style="text-align: left;"
! num || floor || ceil
|-
| -0.999999999999998334665463062265 || {{floor|-0.9999999999999998334665463062265}} || {{ceil|-0.9999999999999998334665463062265}}
|-
| -0.999999999999998334665463062266 || {{floor|-0.9999999999999998334665463062266}} || {{ceil|-0.9999999999999998334665463062266}}
|-
| -0.999999999999998334665463062267 || {{floor|-0.9999999999999998334665463062267}} || {{ceil|-0.9999999999999998334665463062267}}
|-
| -0.999999999999999444888487687420 || {{floor|-0.9999999999999999444888487687420}} || {{ceil|-0.9999999999999999444888487687420}}
|-
| -0.999999999999999444888487687421 || {{floor|-0.9999999999999999444888487687421}} || {{ceil|-0.9999999999999999444888487687421}}
|-
| -0.999999999999999444888487687422 || {{floor|-0.9999999999999999444888487687422}} || {{ceil|-0.9999999999999999444888487687422}}
|-
| 0.(322)01 || {{floor|-0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001}} || {{ceil|-0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001}}
|-
| 0.(323)01 || {{floor|-0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001}} || {{ceil|-0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001}}
|}
 
; See also<nowiki>:</nowiki>
* [[Template:Ceil]]
 
[[Category:Templates using ParserFunctions|{{PAGENAME}}]]
[[Category:Mathematical templates|{{PAGENAME}}]]
 
[[fr:Modèle:Floor]]
[[nl:Sjabloon:Floor]]
</noinclude>

Latest revision as of 10:24, 17 March 2023

⌊{{{1}}}⌋

Template documentation

Description

Displays the parameter wrapped in floor symbols. This template is for display, not calculation.

Examples

Template:Demo Template:Demo Template:Demo Template:Demo Template:Demo Template:Demo Template:Demo Template:Demo

See also

Editors can experiment in this template’s sandbox (create | mirror) and testcases (create) pages.
Subpages of this template.

[[Category:Template documentation pages{{#translation:}}]]

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