Template:Vec/doc

Template:缺乏中文说明 This template creates vectors using arrow notation in HTML, as an alternative to boldface.

Parameters

The template has three parameters:

1. Vector symbol: Insert the character, i.e. A, Ω etc. Default is A; to immediately show the template is in use, and prevent the arrow moving and overlapping text to one side.
2. Arrow direction: Select one of left, right, or double for the arrows →, ←, or ↔ respectively. The default is right.
3. Arrow position: Select one of under or over to place the arrow over or under the character symbolizing the vector. The default is over.

The defaults for 2 and 3 are set to match the LaTeX analogue of \vec: $\overrightarrow{A}$.

Examples

No Template:Tl

Illustration of all possibilities for italic A:

	Default	Overarrow	Underarrow
Default	Template:Vec	Template:Vec	Template:Vec
Left	Template:Vec	Template:Vec	Template:Vec
Right	Template:Vec	Template:Vec	Template:Vec
Double	Template:Vec	Template:Vec	Template:Vec

with code:

	Default	Overarrow	Underarrow
Default	{{vec|''A''}}	{{vec|''A''||over}}	{{vec|''A''||under}}
Left	{{vec|''A''|left}}	{{vec|''A''|left|over}}	{{vec|''A''|left|under}}
Right	{{vec|''A''|right}}	{{vec|''A''|right|over}}	{{vec|''A''|right|under}}
Double	{{vec|''A''|double}}	{{vec|''A''|double|over}}	{{vec|''A''|double|under}}

Formulae:

Vorticity of a fluid with velocity field Template:Vec:

Template:Vec = Template:Vec × Template:Vec

Tangential velocity in rigid body dynamics:

Template:Vec = Template:Vec × Template:Vec

Rotating reference frame:

Template:Frac = Template:Frac − Template:Vec × Template:Vec

Template:Sfrac = Template:Sfrac − Template:Vec × Template:Vec

Including Template:Tl

Illustration of all possibilities for italic A:

	Default	Overarrow	Underarrow
Default	Template:Math	Template:Math	Template:Math
Left	Template:Math	Template:Math	Template:Math
Right	Template:Math	Template:Math	Template:Math
Double	Template:Math	Template:Math	Template:Math

with code:

	Default	Overarrow	Underarrow
Default	{{math|{{vec|''A''}}}}	{{math|{{vec|''A''||over}}}}	{{math|{{vec|''A''||under}}}}
Left	{{math|{{vec|''A''|left}}}}	{{math|{{vec|''A''|left|over}}}}	{{math|{{vec|''A''|left|under}}}}
Right	{{math|{{vec|''A''|right}}}}	{{math|{{vec|''A''|right|over}}}}	{{math|{{vec|''A''|right|under}}}}
Double	{{math|{{vec|''A''|double}}}}	{{math|{{vec|''A''|double|over}}}}	{{math|{{vec|''A''|double|under}}}}

Formulae:

Vorticity of a fluid with velocity field Template:Vec:

Template:Math

Tangential velocity in rigid body dynamics:

Template:Math

Rotating reference frame:

Template:Math

Template:Math

See also

• For quantum state vectors, see Template:Tl.
• For more general templates, allowing arbitrary characters and diacritics set above or below one another, see Template:Tl and Template:Tl.