HP Prime Graphing NW280AAABA manual From Home variables

•From Home variables

Some Home variables can be incorporated into a symbolic definition. To access a Home variable, press a, tap

, select a category of variable, and select the variable of interest. Thus you could have a definition that reads F1(X)=X2+Q. (Q is on the Real sub-menu of the Home menu.)

Home variables are discussed in detail in chapter 28, “Troubleshooting”, beginning on page 507.

•From app variables

All settings, definitions, and results, for all apps, are stored as variables. Many of these variables can be incorporated into a symbolic definition. To access app variables, press

a, tap , select the app, select the category of variable, and then select the variable of interest. You could, for instance, have a definition that reads F2(X)=X2+X–Root. The value of the last root calculated in the Function app is substituted for Root when this definition is evaluated.

App variables are discussed in detail in chapter 28, “Troubleshooting”, beginning on page 507.

•From math functions

Some of the functions on the Math menu can be incorporated into a definition. The Math menu is one of the Toolbox menus (D). The following definition combines a math function (Size) with a Home variable (L1): F4(X)=X2–SIZE(L1). It is equivalent to x2 – n where n is the number of elements in the list named L1. (Size is an option on the List menu, which is a sub-menu of the Math menu.)

•From CAS functions

Some of the functions on the CAS menu can be incorporated into a definition. The CAS menu is one of the Toolbox menus (D). The following definition incorporates the CAS function irem: F5(X)=X2+CAS.irem(45,7). (irem is entered by choosing Remainder, an option on the Division menu, which is a sub-menu of the Integer menu. Note that any CAS command or function selected to operate outside the CAS is given the CAS. prefix.)

An introduction to HP apps 83