Trident Help

RPN Power 48 manual · Chapter 4 of 19

Objects and how to type them

Real and complex numbers, strings, lists, vectors, matrices, names, algebraic expressions, programs and binary integers.

4.1The kinds of objects#

Everything on the stack is an object, and each kind has its own delimiters. Commands behave differently depending on the kind: for example + adds numbers but joins strings and lists.

ObjectLooks likeHow to type it
Real number12.5Digits, . and EEX
Complex number(3,4)▶( )8 3 ▶,9 4, or two reals then ◀R→C1
String"Hello"▶" "7, then letters
List{ 1 2 3 }◀{ }8
Vector[ 1 2 3 ]◀[ ]9
Matrix[[ 1 2 ] [ 3 4 ]]◀[ ]9 twice, one pair per row
Name'x'', then alpha letters
Algebraic expression'x^2+1'', then the expression
Program« 2 * »◀« »7
Binary integer# 10h◀#EEX, then digits
Tagged object:a:5Colon, label, colon, value (see Tags)

4.2Real numbers#

Real numbers are shown with up to 12 digits. Use EEX for powers of ten: 1.5 EEX 3 is 1500. Press +/− while typing to make the number or its exponent negative.

Example 4.1

Type a number in scientific notation

  1. Type 1.5, EEX, 3 and press ENTER.

    1.5EEX3ENTER
Result of the example "Type a number in scientific notation" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: 1500.
You should see1: 1500
Example 4.2

A negative exponent

  1. Type 1, EEX, 3, +/−, ENTER.

    1EEX3+/−ENTER
Result of the example "A negative exponent" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: .001.
You should see1: .001
Example 4.3

Change the sign of the number being typed

  1. Type 5, +/−, ENTER.

    5+/−ENTER
Result of the example "Change the sign of the number being typed" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: -5.
You should see1: -5

4.3Find out what kind of object is on level 1#

The TYPE command (PRG menu, last page) returns a number for the kind of object: 0 real, 1 complex, 2 string, 3 array, 5 list, 6 name, 8 program. It works on any object.

Example 4.4

The type of a list

  1. Make a list and press TYPE (PRG page 4, sixth key).

    ◀{ }81SPC2SPC3ENTER◀PRGMODENXTNXTNXTF6
Result of the example "The type of a list" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: 5 / IFT ERRM ERRN ERR0 DOERR TYPE .
You should see1: 5
Example 4.5

The type of a real number

  1. A real number has type 0.

    3◀PRGMODENXTNXTNXTF6
Result of the example "The type of a real number" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: 0 / IFT ERRM ERRN ERR0 DOERR TYPE .
You should see1: 0
Example 4.6

The type of a string

  1. A string has type 2.

    ▶" "7ααMODE◀F5◀PREVNXT◀PREVNXT◀SYMB'α▶7ENTER◀PRGMODENXTNXTNXTF6
Result of the example "The type of a string" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: 2 / IFT ERRM ERRN ERR0 DOERR TYPE .
You should see1: 2

4.4Tagged values#

A tag labels a value so you remember what it is. The STR menu has →TAG (put a label on level 2 using the name or string on level 1) and DTAG (remove the label). Calculations ignore the tag and use the value.

STR page 2 with the →TAG key. The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: / TAIL NUM CHR OBJ→ REVLI →TAG .
STR page 2 with the →TAG key.

HP 48 and HP 50g is a trademark of HP Inc.. Trident Calculator is an independent product by South View Studios and is not affiliated with, sponsored by or endorsed by HP. The name is used only to describe the kind of calculator this model resembles; Trident's names, keys, display, fonts and software are its own clean-room design.