MATLAB uses this property to select a font from those available on your. Check this link for more details about the annotation() function. See also Drawing Text in a Box in the MATLAB Graphics documentation for an.

You can also add multiple texts at multiple positions on the plot with different text, line styles, color, size, and box. You can give your desired color to the text using the Color property and the box using the EdgeColor property. For example, let’s plot a cosine wave and put some text on it with font size 18 and red color and a black box around the text. You can also change the properties of the text like the font size using the FontSize property and the color using the Color property etc. If you give the coordinates which don’t lie on the plot, you can’t see the text. Simply plot the variable and then select the coordinates from the plot and then use the text() function to place the text on the selected coordinates. You need to pass the x and y coordinate on which you want to place the text. You can also use the text() function to add text with a box to the plot. Add a Text Box on a Plot Using the text() Function in MATLAB

Check this link for more details about the annotation() function. In the above code, the function handle a will display all the properties of the text box on the command window, which we can change using the function handle a. For example, let’s change all these properties of the text box using a function handle. You can also change the name of the font using the FontName property, the size of the font using the FontSize property, the color of the text using the Color property, the background color of the text box using the BackgroundColor property, and the color of the box using the EdgeColor property. In the above code, you can change the text and dimensions of the text box according to your requirements.

Font box matlab text