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Inserting a math
symbol in a KeyMath
expression
To insert a symbol in a document, use the command BACKSPACE with DOTS 3-5 or select Insert symbol
from the context menu to open a list of symbols according to the Braille code in use. Using first letter
navigation, type the first letter of the category of symbols you wish to type. For example, if you wish to
type the symbol for “approximately equal”, type the letter A, and press ENTER.
Generating, reading,
and modifying
graphic objects in
KeyMath
15.5.1 Generating a graph
Thanks to a partnership with Desmos, an online graphing calculator company, it is possible to generate a
graphic preview of a function in KeyMath. This is particularly useful when you need to show teachers or
sighted colleagues a visual representation of your math function.
To generate a graphic in KeyMath, press ENTER with G to toggle between the Math typesetting and
Graphing calculator rendering mode until you have selected Graphing calculating mode. Alternatively,
you can select Graphing calculating mode in the contextual menu.
Once this is done, select the first edit box in KeyMath, type in your function and press ENTER. Your
equation must be valid and use variable y as the vertical axis and variable x as the horizontal axis.
The following are examples of valid functions in KeyMath: y=x, y=3x+6, y=4x, x²+y²=4, x²+y²≤4, etc.
You may also define constants on different lines to generate your graph. For example, the following
equations will successfully generate a graph in KeyMath:
y=ax+b
–LINE BREAK—
a=3
–LINE BREAK—
b=2
Don’t forget that you must write your function while respecting the syntax of your selected Braille code
(Nemeth, UEB, Braille image, LaTeX, etc.) for it to be parsed properly.
You can also customize your graph by accessing the Graph settings menu in the contextual menu.
Options include setting the type of graph (regular or polar), setting the lower and upper boundaries of
your graph, and showing or hiding axes and grid on the tactile preview.
Note that using undefined variables other than x or y will not generate a graph, even if you change the
axis name to that variable.
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