MATLAB Annotation

15 Dec, 2021
Annotations in MATLAB is a way of adding explanation or notes to the plots. Annotations add more information to the plots. There are different syntax formations for adding annotations to a plot:
annotation(lineType,x,y)
annotation(lineType)
annotation(shapeType,dim)
annotation(shapeType)
annotation(___,Name,Value)
Let’s discuss all the above functions in detail:
Creates a line or arrow annotation between two points in the current figure.
lineType takes different values as ‘line’, ‘arrow’, ‘doublearrow’, or ‘textarrow’.
x and y are two-element vectors of the form [x_begin x_end] and [y_begin y_end], respectively.
Annotation has starting point as (x_begin,y_begin) and ending point as (x_end,y_end).
Example :
Draw a plot y = x using plot(1:10).
Specify x and y values i.e starting point as (0.4, 0.8) and ending point as (0.6. 0.6).
Specify lineType as ‘arrow’ with x and y as two-element vectors.
Matlab
% Plots y = x line from 1 to 10plot(1:10) x = [0.4 0.6];y = [0.8 0.6]; % annotation with lineType 'arrow'annotation('arrow',x,y)
Output : 
Creates an annotation of specified “lineType” with default position starting from (0.3, 0.3) and ending at (0.4, 0.4).
Example : 
Draw a plot y = -x.
Specify lineType as ‘arrow’.
Matlab
% Plot y = -x from 1 to 10x = [1:10]y = -xplot(x,y) % annotation of lineType 'arrow'% at default positionsannotation('arrow')
Output : 
Creates an annotation in the shape of a rectangle or eclipse with given dim to the plot.
ShapeType takes values as ‘rectangle’, ‘ellipse’, or ‘textbox‘.
dim is a vector of size 4 as [x y w h], where (x, y) is the lower-left endpoint of rectangle and w, h are width and height of rectangle respectively.
Example : 
Plot the graph y=x^2 from 0 to 10.
Specify dim as the lower-left endpoint (0.2, 0.3) with width and height as 0.3 and 0.3 respectively.
Specify annotation of shape textbox by including a string in the textbox.
Matlab
% Plot y = x^2 from 0 to 10x = [0:10]y = x.*xplot(x,y) % Dimensions of textboxdim = [0.2 0.3 0.3 0.3]str = 'Parabola y = x^2'; % Annotation of shapeType 'textbox'% at "dim" with "str"% content inside the textboxannotation('textbox',dim,'String',str);
Output : 
Creates the annotation with the mentioned shape in the default position so that the lower-left endpoint is at (0.3, 0.3) and the width and height are both 0.1.
Example : 
Plot the graph y = x^2.
Create an annotation of shapeType = ‘rectangle’ with default positions of the rectangle.
Matlab
% Plot y = ^2 from 0 to 10x = [0:10]y = x.*xplot(x,y) % Annotation with shapeType='rectangle'% with default positions% of rectangleannotation('rectangle');
Output :
Creates an annotation by specifying properties as Name-Value pair arguments.
Some of the properties are like String, color, FaceColor, FaceAlpha etc.
Example : 
Plot the graph y = x^3-12x.
Specified the eclipse annotation with color as ‘red’ and interior color as ‘green’ and FaceAlpha = 0.3. specifies FaceColor is slightly transparent.
Matlab
% Plot y = x^3 - 12x from -5 to +5x = linspace(-5,5);y = x.^3 - 12*x;plot(x,y) % Dimensions of eclipsedim = [.3 .50 .25 .15]; % eclipse takes dimensions as it'll% fit into specified% rectangle dimension% Annotation with color , FaceColoe and% FaceALpha of eclipseannotation('ellipse',dim,'color','red','FaceColor','green','FaceAlpha',.3)
Output : 
 
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