Calculator input methods: Difference between revisions

Revision as of 08:13, 4 May 2009

Revision as of 08:38, 4 May 2009

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{{main|Reverse Polish Notation}}

{| class="wikitable" border="1"

|+ Examples

! Formular

! Key strokes

! Key stroke count

|-

Example: | <math>\sin1 30+ 2 \times \cos 303</math>

; with reverse polish notation:| <code>31</code> <code>0ENTER</code> <code>SIN2</code> <code>3ENTER</code> <code>03</code> <code>COS×</code> <code>×+</code>

| 7

|-

| <math>\sin 30 \times \cos 30</math>

; with algebraic logic:| <code>3</code> <code>0</code> <code>SIN</code> <code>×</code> <code>3</code> <code>0</code> <code>COS</code> <code>=×</code>

| 7

|}

== infix logic ==

{| class="wikitable" border="1"

|+ Examples

! Formular

! Key strokes

! Key stroke count

|-

| <math>1 + 2 \times 3</math>

; with direct algebraic logic :| <code>SIN</code> <code>3</code> <code>0</code> <code>→2</code> <code>×</code> <code>COS3</code> <code>3+</code> <code>01</code> <code>ENTER=</code>

| 6

|-

| <math>\sin 30 \times \cos 30</math>

| <code>3</code> <code>0</code> <code>SIN</code> <code>×</code> <code>3</code> <code>0</code> <code>COS</code> <code>=</code>

| 8

|}

== algebraic logic ==

{| class="wikitable" border="1"

|+ Examples

! Formular

! Key strokes

! Key stroke count

|-

| <math>1 + 2 \times 3</math>

| <code>1</code> <code>+</code> <code>2</code> <code>×</code> <code>3</code> <code>=</code>

| 6

|-

| <math>\sin 30 \times \cos 30</math>

| <code>3</code> <code>0</code> <code>SIN</code> <code>×</code> <code>3</code> <code>0</code> <code>COS</code> <code>=</code>

| 8

|}

== [[BASIC]] notation ==

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Other known entry modes are '''Algebraic logic (A.L.)''' which was used in earlier calculators and [[BASIC]] notation which was used BASIC programmable [[Pocket computer|Pocket computers]]. Both can be seen as ancestors to D.A.L.

{| class="wikitable" border="1"

Example: <math>\sin 30 \times \cos 30</math>

|+ Examples

! Formular

! Key strokes

! Key stroke count

|-

| <math>1 + 2 \times 3</math>

| <code><code>1</code> <code>+</code> <code>2</code> <code>×</code> <code>3</code> <code>ENTER</code>

| 6

|-

| <math>\sin 30 \times \cos 30</math>

| <code>SIN</code> <code>3</code> <code>0</code> <code>→</code> <code>×</code> <code>COS</code> <code>3</code> <code>0</code> <code>ENTER</code>

| 9

|}

Note 1: the <code>→</code> in the 2nd example: most DAL calculators will automatically insert needed <code>(</code> <code>)</code>parenthesis and the <code>→</code> key skips over the <code>)</code>closing parenthesis from the sin operation. Machines equipped with an alphanumeric display will display <tt>SIN(30)×COS(30)</tt> before pressing <code>ENTER</code>.

; with reverse polish notation: <code>3</code> <code>0</code> <code>SIN</code> <code>3</code> <code>0</code> <code>COS</code> <code>×</code>

display <tt>SIN(30)×COS(30)</tt> before pressing <code>ENTER</code>.

; with algebraic logic: <code>3</code> <code>0</code> <code>SIN</code> <code>×</code> <code>3</code> <code>0</code> <code>COS</code> <code>=</code>

; with direct algebraic logic : <code>SIN</code> <code>3</code> <code>0</code> <code>→</code> <code>×</code> <code>COS</code> <code>3</code> <code>0</code> <code>ENTER</code>

Note 1: the <code>→</code>: most DAL calculators will automatically insert needed <code>(</code> <code>)</code> and the <code>→</code> skips over the <code>)</code> from the sin operation. Machines equipped with an alphanumeric display will display <tt>SIN(30)×COS(30)</tt> before pressing <code>ENTER</code>.

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== Criticism ==

As seen in the example above the increased need for <code>(</code> and <code>)</code> results in a larger number of key presses to enter a formula. In the example above: D.A.L. 9 key presses, BASIC: 12 .. 16 key presses, A.L.: 8 key presses, RPN: 7 key presses.

-->

== References ==

Line 60 ⟶ 108:

== External links ==

[[Category:Calculators]]