ConstantLine Properties
Constant line appearance and behavior
A constant line is a line that is graphed at a specified x-
or y-value in Cartesian axes. The xline and
yline functions create constant vertical and horizontal lines,
respectively. You can modify the appearance and behavior of the constant line by changing
ConstantLine property values.
xl = xline(4); xl.LineWidth = 2;
Location
Labels
Label — Line label
'' (default) | character vector | cell array of character vectors | string array | numeric array
Line label, specified as a character vector, cell array of character vectors, string array, or numeric array. To create a multiline label, use a string array or a cell array of character vectors.
Example: 'cutoff frequency'
Example: {'first line','second line'}
Example: ["first line" "second line"]
To include special characters, such as superscripts, subscripts, Greek letters, or
mathematical symbols, use TeX markup. For a list of supported markup, see the Interpreter property.
LabelHorizontalAlignment — Horizontal alignment of label
'right' (default) | 'left' | 'center'
Horizontal alignment of the label with respect to the line, specified as one of the options in the table.
| Option | Description | |
|---|---|---|
'right' | Right side of the line.
| |
'left' | Left side of the line.
| |
'center' | Center of the line. For vertical lines, the label segments the line.
| |
LabelVerticalAlignment — Vertical alignment of label
'top' (default) | 'middle' | 'bottom'
Vertical alignment of the label with respect to the line, specified as one of the options in the table.
| Option | Description | |
|---|---|---|
'top' | Top of the line.
| |
'middle' | Middle of the line. For horizontal lines, the label segments the line.
| |
'bottom' | Bottom of the line.
| |
LabelOrientation — Label orientation
'aligned' (default) | 'horizontal'
Label orientation, specified as 'aligned' or
'horizontal'. Examples are shown in the table.
| Orientation | Description | |
|---|---|---|
'aligned' | Label has the same orientation as the line.
| |
'horizontal' | Label is horizontal, regardless of the line orientation.
| |
Text interpreter, specified as one of these values:
'tex'— Interpret characters using a subset of TeX markup.'latex'— Interpret characters using LaTeX markup.'none'— Display literal characters.
TeX Markup
By default, MATLAB® supports a subset of TeX markup. Use TeX markup to add superscripts and subscripts, modify the font type and color, and include special characters in the text.
Modifiers remain in effect until the end of the text.
Superscripts and subscripts are an exception because they modify only the next character or the
characters within the curly braces. When you set the interpreter to 'tex',
the supported modifiers are as follows.
| Modifier | Description | Example |
|---|---|---|
^{ } | Superscript | 'text^{superscript}' |
_{ } | Subscript | 'text_{subscript}' |
\bf | Bold font | '\bf text' |
\it | Italic font | '\it text' |
\sl | Oblique font (usually the same as italic font) | '\sl text' |
\rm | Normal font | '\rm text' |
\fontname{ | Font name — Replace
| '\fontname{Courier} text' |
\fontsize{ | Font size —Replace
| '\fontsize{15} text' |
\color{ | Font color — Replace
red, green,
yellow, magenta,
blue, black,
white, gray,
darkGreen, orange, or
lightBlue. | '\color{magenta} text' |
\color[rgb]{specifier} | Custom font color — Replace
| '\color[rgb]{0,0.5,0.5} text' |
This table lists the supported special characters for the
'tex' interpreter.
| Character Sequence | Symbol | Character Sequence | Symbol | Character Sequence | Symbol |
|---|---|---|---|---|---|
| α |
| υ |
| ~ |
| ∠ |
|
|
| ≤ |
|
|
| χ |
| ∞ |
| β |
| ψ |
| ♣ |
| γ |
| ω |
| ♦ |
| δ |
| Γ |
| ♥ |
| ϵ |
| Δ |
| ♠ |
| ζ |
| Θ |
| ↔ |
| η |
| Λ |
| ← |
| θ |
| Ξ |
| ⇐ |
| ϑ |
| Π |
| ↑ |
| ι |
| Σ |
| → |
| κ |
| ϒ |
| ⇒ |
| λ |
| Φ |
| ↓ |
| µ |
| Ψ |
| º |
| ν |
| Ω |
| ± |
| ξ |
| ∀ |
| ≥ |
| π |
| ∃ |
| ∝ |
| ρ |
| ∍ |
| ∂ |
| σ |
| ≅ |
| • |
| ς |
| ≈ |
| ÷ |
| τ |
| ℜ |
| ≠ |
| ≡ |
| ⊕ |
| ℵ |
| ℑ |
| ∪ |
| ℘ |
| ⊗ |
| ⊆ |
| ∅ |
| ∩ |
| ∈ |
| ⊇ |
| ⊃ |
| ⌈ |
| ⊂ |
| ∫ |
| · |
| ο |
| ⌋ |
| ¬ |
| ∇ |
| ⌊ |
| x |
| ... |
| ⊥ |
| √ |
| ´ |
| ∧ |
| ϖ |
| ∅ |
| ⌉ |
| 〉 |
| | |
| ∨ |
| 〈 |
| © |
LaTeX Markup
To use LaTeX markup, set the interpreter to 'latex'. Use dollar
symbols around the text, for example, use '$\int_1^{20} x^2 dx$'
for inline mode or '$$\int_1^{20} x^2 dx$$' for display
mode.
The displayed text uses the default LaTeX font style. The
FontName, FontWeight, and
FontAngle properties do not have an effect. To change the
font style, use LaTeX markup.
The maximum size of the text that you can use with the LaTeX interpreter is 1200 characters. For multiline text, this reduces by about 10 characters per line.
For more information about the LaTeX system, see The LaTeX Project website at https://www.latex-project.org/.
Color and Styling
Color — Line color
[0.15 0.15 0.15] (default) | RGB triplet | hexadecimal color code | 'r' | 'g' | 'b' | ...
Line color, specified as an RGB triplet, a hexadecimal color code, a color name, or a short name.
For a custom color, specify an RGB triplet or a hexadecimal color code.
An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]; for example,[0.4 0.6 0.7].A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (
#) followed by three or six hexadecimal digits, which can range from0toF. The values are not case sensitive. Thus, the color codes'#FF8800','#ff8800','#F80', and'#f80'are equivalent.
Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.
| Color Name | Short Name | RGB Triplet | Hexadecimal Color Code | Appearance |
|---|---|---|---|---|
'red' | 'r' | [1 0 0] | '#FF0000' |
|
'green' | 'g' | [0 1 0] | '#00FF00' |
|
'blue' | 'b' | [0 0 1] | '#0000FF' |
|
'cyan'
| 'c' | [0 1 1] | '#00FFFF' |
|
'magenta' | 'm' | [1 0 1] | '#FF00FF' |
|
'yellow' | 'y' | [1 1 0] | '#FFFF00' |
|
'black' | 'k' | [0 0 0] | '#000000' |
|
'white' | 'w' | [1 1 1] | '#FFFFFF' |
|
'none' | Not applicable | Not applicable | Not applicable | No color |
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.
| RGB Triplet | Hexadecimal Color Code | Appearance |
|---|---|---|
[0 0.4470 0.7410] | '#0072BD' |
|
[0.8500 0.3250 0.0980] | '#D95319' |
|
[0.9290 0.6940 0.1250] | '#EDB120' |
|
[0.4940 0.1840 0.5560] | '#7E2F8E' |
|
[0.4660 0.6740 0.1880] | '#77AC30' |
|
[0.3010 0.7450 0.9330] | '#4DBEEE' |
|
[0.6350 0.0780 0.1840] | '#A2142F' |
|
Example: 'g'
Example: [0.6 0.2 0.5]
Example: '#D2F9A7'
Line style, specified as one of the options listed in this table.
| Line Style | Description | Resulting Line |
|---|---|---|
'-' | Solid line |
|
'--' | Dashed line |
|
':' | Dotted line |
|
'-.' | Dash-dotted line |
|
'none' | No line | No line |
LineWidth — Line width
0.5 (default) | positive value
Line width, specified as a positive value in points.
Alpha — Line transparency
0.7 (default) | scalar in range [0,1]
Line transparency, specified as a scalar in the range [0,1]. A
value of 1 is opaque and 0 is completely
transparent. Values between 0 and 1 are
semitransparent.