Texas Instruments TINSPIRECX Calculator User Manual


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© 2012 Texas Instruments Educaon Technology Page 19
3 ways to dene variables
What you type is not necessarily what
you get: above πr
2
and 2πr were a
ctually typed as.
PIrRq
2PIrR
Use of funcon notaon

The calculator applicaon allows you to dene variables as single numbers, funcons, lists, matrices and even
strings.
There are three equivalent ways to store a variable.
You can use /h
(store),
or /t(Ï)
or Dene
 can be typed leer by leer, followed by a space
or alternavely it can be entered from the Catalogue:
press kD to nd it.
Noce also you can:
• display mulple values in a list using curly brackets /);
• use a colon for mulple statements on the entry line º.
In the last entry the value of r was changed to 5 but
noce the dierence between a and c(r): whereas
c is a dened funcon of r, a had been given a
parcular value.
This screen illustrates the use of funcon notaon on the
calculator screen. Noce that h(g(x)) can be evaluated
numerically but the TI-Nspire CAS would be able to
evaluate it algebraically.
You will see in Tutorial 4 that funcons dened like this in the
Calculator applicaon can then be used in the Graphs and
Geometry applicaon. So please enter these denions of
g(x) and h(x) on your handheld now.
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