Texas Instruments TI-92+, Tip List

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propFrac() (proper fraction) function algorithm.
propFrac() uses polynomial division with remainder to determine the quotient polynomial and the
numerator of the resulting fraction.
Superscripted numbers appear on multiple output statements - why?
Some number are superscripted on multiple output statements because the "pretty print" is on. In the
pretty print mode, the unit will calculate the size in pixels of the rectangle needed to hold this output.
The coordinates given start in the upper left most corner of the calculated rectangle needed to hold the
output. The second OUTPUT command doesn't know the size of the previous output, so if the
coordinates given in OUTPUT #2 aren't specified correctly by the user then they will see overlapping or
superscripting on the screen.
There are two ways to get around this. First, a person can calculate his/her coordinates for the
OUTPUT command through trial and error. Second, they can create a single string containing the
results of the multiple outputs and then perform one OUTPUT command using that one large string.
Soft Warehouse's TI-92 Program Library.
This library includes supplementary functions and subroutines that add to the functionality of the TI-92.
It is available for free download .
The library is currently divided into the following three TI-GRAPH LINK group files:
UNIT.92G implements automatic units algebra and conversion.
ELEM.92G implements pre-calculus mathematics capabilities such as solution of simultaneous
nonlinear equations, general regression, contour plots and plots of implicitly-defined functions.
ADV.92G implements more advanced mathematics capabilities such as symbolic solution of differential
equations and vector calculus.
Each group includes a corresponding "about...()" program. It states the purpose of the folder, the
copyright and abbreviated free copy provisions, then "installs" the folder by performing some
housekeeping and setup tasks.
Symbolic Manipulation (Computer Algebra) - what is it?
The terms Symbolic Manipulation or Computer Algebra describe a software feature set that use the
mathematical rules of algebra and calculus to simplify expressions full of symbols and undefined
variables as well as numeric values. Some examples are:
x+3x-y+4y will simplify to 4x+3y
solve(2x-3=y,x) will return the solution x=(y+3)/2
derivative of 3x^4 with respect to x will simplify to 12x^3
(x^3+x)/2x will simplify to (x^2+1)/2
taylor() (taylor series) function algorithm.
taylor(u,x,n,a) is sum(limit(d(u,x,k),x,a)*(x-a)^k/k!,k,0,n), computed iteratively to avoid redundant
computation of lower-order derivatives.
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