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## HP 17Bii, 17Bii+, 19Bii, 48g, and 48g+ Calculators - Tips for Working with the Solver Environment

Overview
This document addresses solver questions for the HP 17bii, 19bii, 48g, and 48g+ calculators. On the 48g series, this environment is called SOLVR.
Solver problems
The following table addresses possible solver problems for the HP 17bii, 19bii, 48g, and 48g+ calculators.
 Calculator Problem Solution HP 17bii, 17bii+, and 19bii Is it possible to access data stored in the CFLO and SUM lists from the solver? HP 17bii and 17bii+: Yes. See section on "Accessing CFLO and SUM lists from the Solver" immediately following this table. HP 19bii: Yes. See section on "Solver Functions that use CFLO Lists," and "Solver Functions that use SUM Lists" in the sections that follow this table. HP 17bii, 17bii+, and 19bii Indicating multiplication in an equation typed into the solver. HP 17bii and 17bii+: Use the multiplication key (x). Do not use the letter "x" in the alpha menu. HP 19bii: Use the multiplication key (x) on the right side of the keypad. Do not use the "x" letter key to indicate multiplication HP 48g and 48g+ Equation library solver gives SI units when ENG is specified (or vice-versa). The EQUATION LIBRARY uses and creates global variables. If the variables were created before, then they still exist (until purged), as do their unit definitions. From the equation list, in EQUATION LIBRARY, press VARS, NXT, then PURG, then select the unit system required.
Accessing CFLO and SUM Lists from the Solver (HP 17bii and 17bii+)
Solver equations can be used to perform calculations other than those in the CFLO and SUM menus by using data stored in the CFLO and SUM lists. The following Solver functions gain access to these lists.
• SIZEC(CFLO-listname) returns the number of the last flow in the specified CFLO list. For example, if the last flow in the list INV were FLOW (6) =5, 000.00, then SIZEC (INV) would equal to 6.00
• FLOW(CFLO-listname:flownumber) returns the value of the specified flow.
• #T (CFLO-listname:flownumber) returns the number of times the specified flow occurs.
• SIZES(SUM-listname) returns the number of items in the specified SUM list.
• ITEM(SUM-listname:itemnumber) returns the value of the specified item.
HP 19bii solver functions that use SUM lists
Two functions allow the Solver to use information stored in SUM lists:
• SIZES(listname) returns the number of entries in the specified SUM list
• ITEM(listname:x) returns the value of entry(x) in the specified SUM list
HP 19bii solver functions that use CFLO lists
Three functions allow the Solver to use information stored in the CFLO lists:
• SIZEC(listname) returns the group number of the last flow in the specified CFLO list. For example, if the last entries are FLOW(8) and #TIMES(8), SIZEC returns 8.
• FLOW(listname:x) returns the value of FLOW(x) in the specified CFLO list.
• #T(listname:x) returns the value of #TIMES(x) in the specified CFLO list.

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