Graphing and Geometry screens differ by one pixel each way - why?
In function graphing, it is very important to teachers that the origin pixel be at (0,0) when abs(xmin) =
xmax (e.g., -10 to 10). So, we had to make the screen an odd number of pixels high and wide. This
was a change made from the TI-81 to the TI-82 and has stuck on subsequent products.
On the Geometry screen, it is not as important that the default window be symmetrical since the user
changes the window interactively, instead of on a menu. We shifted the origin one pixel to have it at
(0,0) and simply did not delete the rightmost column of pixels. The default window is from -4.148 to
+4.103 in the x direction.
Implied multiplication-x[space](a+b) is not read as multiplication?
The only significance that the parser gives to white space is that it terminates tokens. Thus, abcd is a
single name, but ab cd are two separate names, because the space caused the name parsing
algorithm to stop after the b.
Spaces do not directly create implied multiplication. Implied multiplication occurs when two valid factors
are found in succession without any other binary operator between them. When the next non-blank
following a valid name is a left parenthesis, the name is assumed to be a function/program reference.
Limiting the glare off the screen in classrooms
Try adjusting the display contrast using [diamond] [+] to darken the display or [diamond] [-] to lighten
the display.
Hold the unit at a different angle to change what is being reflected in the display.
We used this type of display to increase the the brightness of the pixels in the display.
Integration - why is a numeric answer returned when I expected symbolic?
If you entered an integration problem and received a numeric answer when you expected a symbolic
one, there are a couple of reasons.
First, see if the variable you are integrating with respect to has a value stored to it (i.e. X has a value of
5). If it does, you will need to delete that variable or use a different one. You can delete the variable
by pressing F6, Enter from the home screen or by using the DelVar command.
If the variable did not have a value stored to it, the TI-92 may have resorted to a numerical approach to
find the solution for the problem. This could happen when the problem you are solving is too 'complex'
for the symbolic algorithm to solve.
Menu options are fuzzy - Why?
Some of the commands are not accessible from all screens or modes. If a command appears
unreadable, it means that particular command line is unaccessable from the current mode. It will be
available from a different screen or application.
tCollect() (trig collect) function algorithm
tCollect() repeatedly uses the well-known formulas for products and integer powers of sines and
cosines, such as those given in the CRC tables.
tExpand() (trig expand) function algorithm
tExpand() repeatedly uses the well-known formulas for the sine and cosine of multiple angles, angle
sums and angle differences, such as those given in the CRC tables.
B - 19
Summary of Contents for TI-92+
Page 52: ...Component side of PCB GraphLink I O connector detail 1 41...
Page 53: ...LCD connector detail PCB switch side 1 42...
Page 54: ...Key pad sheet contact side Key pad sheet key side 1 43...
Page 55: ...Key cap detail 1 44...
Page 57: ...Component side of PCB with shield removed A detail view of the intergrated circuits 1 46...
Page 410: ...void extensionroutine2 void Credit to Bhuvanesh Bhatt 10 4...