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In [[mathematics]], a '''unary operation''' is an [[Operation (mathematics)|operation]] with only one [[operand]], i.e. a single input. Specifically, it is a function
:<math>f:\ A\to A</math>
where ''A'' is a [[Set (mathematics)|set]]. In this case ''f'' is called a unary operation on ''A''.
 
Common notations are [[prefix notation]] (e.g. +, −, not), [[postfix notation]] (e.g. [[factorial]] n!), functional notation (e.g. sin x or sin (x)), and [[superscript]]s (e.g. [[transpose]] ''A<sup>T</sup>''). Other notations exist as well. For example, in the case of the [[square root]], a horizontal bar extending the square root sign over the argument can indicate the extent of the argument.
 
==Unary negative and positive==
As unary operations have only one operand they are evaluated before other operations containing them {{Citation needed|date=July 2013}}. Here is an example using negation:
 
:3 − −2
 
Here the first '−' represents the binary subtraction operation, while the second '−' represents the unary negation of the 2 (or '−2' could be taken to mean the integer −2). Therefore, the expression is equal to:
 
:3 − (−2) = 5
 
Technically there is also a unary positive but it is not needed since we assume a value to be positive:
 
:(+2) = 2
 
Unary positive does not change the sign of a negative operation:
 
:(+(−2)) = (−2)
 
In this case a unary negative is needed to change the sign:
 
:(−(−2)) = (+2)
 
Unary operators (called "monadic" in APL) are also used in programming languages.
 
===C family of languages===
In the [[C (programming language)|C]] family of languages, the following operators are unary:
 
*Increment: <code>++<span style="color:gray;">x</span>, <span style="color:gray;">x</span>++</code>
*Decrement: <code>−−<span style="color:gray;">x</span>, <span style="color:gray;">x</span>−−</code>
*[[Reference (computer science)|Address]]: <code>&<span style="color:gray;">x</span></code>
*[[Indirection]]: <code>*<span style="color:gray;">x</span></code>
*Positive: <code>+<span style="color:gray;">x</span></code>
*Negative: <code>−<span style="color:gray;">x</span></code>
*[[Signed number representations|One's complement]]: <code>~<span style="color:gray;">x</span></code>
*[[Negation|Logical negation]]: <code>!<span style="color:gray;">x</span></code>
*[[Sizeof]]: <code>sizeof <span style="color:gray;">x</span>, sizeof(<span style="color:gray;">type-name</span>)</code>
*[[Type conversion|Cast]]: <code>(''type-name'') ''<span style="color:gray;">cast-expression</span></code>
 
===Unix Shell (Bash)===
 
In the Unix/Linux shell (bash/sh), ''''$'''' is a unary operator, used for parameter expansion, replacing the name of a variable by its (sometimes modified) value. For example:
 
* Simple expansion:  <code>$<span style="color:gray;">x</span></code>
* Complex expansion:  <code>${#<span style="color:gray;">x</span>}</code>
* Command substitution:  <code>$(<span style="color:gray;">cmd</span>)</code>
* Arithmetic expansion:  <code>$((<span style="color:gray;">expr</span>))</code>
 
===Other languages===
 
====Windows PowerShell====
*Increment: <code>++<span style="color:gray;">$x</span>, <span style="color:gray;">$x</span>++</code>
*Decrement: <code>−−<span style="color:gray;">$x</span>, <span style="color:gray;">$x</span>−−</code>
*Positive: <code>+<span style="color:gray;">$x</span></code>
*Negative: <code>−<span style="color:gray;">$x</span></code>
*Logical negation: <code>-not <span style="color:gray;">$x</span></code>
*[[Execution (computing)|Invoke]] in current [[Scope (programming)|scope]]: <code>.<span style="color:gray;">$x</span></code>
*Invoke in new scope: <code>&<span style="color:gray;">$x</span></code>
*Cast: <code>[''type-name''] ''<span style="color:gray;">cast-expression</span></code>
 
==See also==
* [[Binary operation]]
* [[Ternary operation]]
* [[Arity]]
* [[Operation (mathematics)]]
* [[Operator (programming)]]
 
==References==
*{{MathWorld|title=Unary Operation|urlname=UnaryOperation|author=Matt Insall}}
 
{{DEFAULTSORT:Unary Operation}}
[[Category:Elementary algebra]]
[[Category:Operators (programming)]]

Latest revision as of 04:59, 9 January 2015

We might discover effortless methods to speed up computer by making the most out of the built in tools in your Windows in addition to obtaining the Service Pack updates-speed up your PC and fix error. Simply follow a limited guidelines to instantly make your computer rapidly than ever.

Install an anti-virus software. If you absolutely have that on we computer then carry out a full program scan. If it finds any viruses found on the computer, delete those. Viruses invade the computer and make it slower. To safeguard the computer from different viruses, it happens to be greater to keep the anti-virus software running when we use the web. We could also fix the protection settings of your web browser. It might block unknown plus dangerous websites and block off any spyware or malware trying to get into the computer.

The error is basically a result of issue with Windows Installer package. The Windows Installer is a tool chosen to install, uninstall and repair the most programs on your computer. Let us discuss a limited items which helped a lot of individuals that facing the synonymous issue.

There is several reasons why the computer may lose speed. Normal computer utilize, like surfing the Internet can receive the running system in a condition where it has no choice however, to slow down. The constant entering plus deleting of temporary files which occur whenever you surf the Web leave our registries with thousands of false indicators in the operating system's registry.

Another thing you should check is whether or not the system mechanic professional program that you are considering has the ability to identify files plus programs which are good. One of the registry cleaner programs you may try is RegCure. It is helpful for speeding up and cleaning up difficulties on your computer.

S/w associated error handling - If the blue screen physical memory dump arises after the installation of s/w application or a driver it may be which there is program incompatibility. By booting into safe mode plus removing the software you are able to fast fix this error. You can furthermore try out a "system restore" to revert to an earlier state.

It is important which we remove obsolete registry entries from your system regularly, if you need your program to run faster, which is. If you don't keep a registry clean, a time may come whenever a program may stop working altogether. Next, the just choice is to reformat your hard drive and begin over!

If you wish To have a computer with quick running speed, you'd better install a good registry cleaner to clean the useless files for we. As long as we take care of your computer, it usually keep in advantageous condition.

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