NIXON Eval

Eval
Infix Calculator

Help and Information

Introduction

Infix Calculator works like a physical scientific calculator. Expressions are entered like they would be written.

Examples

sin(pi/3+2pi*32) = 0.8660254037844377
deriv(X^2,X,.01) = 9.999999999999787
ln(-1) = 3.1415926535898i [Complex]

Modes of Operation

To change the mode, enable/disable Complex Numbers in Preferences.

Normal - Calculations involving real numbers only. All functions are enabled.
Complex - Calculations involving both complex numbers and real numbers. Only functions accepting complex arguments are enabled.

Last Answer

When an expression is evaluated successfully, its result is stored in variable ans (Last Answer). Pressing the [+],[−],[×], or [÷] keys when the cursor is at the beginning of the expression will insert ans at the beginning of the expression. To prevent this from happening for negation, press [INV] then [(-)].

Interface

Editing Buttons

C, CA	Clear/Clear All [CA] Clears last answer as well as all user-defined variables.
▲ ▼	Previous/Next Expression
< >	Move Cursor Left/Right
	Delete

Evaluation History

The topmost area is the list of all previous evaluations. This list can be scrolled. Scroll down to hide all buttons. To show the buttons again, scroll up, click the input box, or press [BACK] on your device.

To insert an expression from the list into the input box, long press the expression and choose [Insert Expression] from the resulting menu.
To store the result of an expression from the list, long press the expression and choose [Store Result] from the resulting menu.

Display Mode

Click on any evaluation to change the display mode. Possible display modes are as follows:

Real Numbers
Normal Mode	Displays numbers as decimals.
Fraction Mode	Displays numbers as improper fractions when possible. If fractions are approximated, they will be displayed mixed.
Mixed Fraction Mode	Displays numbers as mixed fractions when possible.

Complex Numbers
Complex Form a+bi	Displays complex numbers in the form a+bi.
Fraction Mode	Displays complex numbers in the form a+bi as fractions, e.g.: 2/3+4/5i
Complex Form re^Θi	Displays complex numbers in polar form, e.g.: 1.0 e^{0.7853981633974482i}

Notes

General Notes

Internal Fractions

Numbers are stored internally as fractions when possible. There is no separate fraction button to enter fractions. Use the Divide key [÷] to enter fractions. Numbers up to 6 decimal places in length are also converted into fractions.

Variables and Constants

A, B, C, X, Y, Z

User-defined Variables

Can be modified by pressing [STO] followed by variable in calculator, or by using the sto() function. Can be fractions, complex numbers, and real numbers.

x, y, z, t, v, r, θ m

Volatile Variables

Modified by graphing and table features such as tracing.
Variables x, y are always modified. Variable m (Derivative) is calculated for 2D functions.

In 3D function mode, z is also modified.
In 2D parametric mode, t is also modified.
In 3D parametric mode, z, t, and v are also modified.
In 2D polar mode, r and θ are also modified.

Cannot be fractions or complex numbers.

ANS

Last Answer

In Infix Calculator, result of previous calculation is stored in this variable. Can be fraction, complex number, or real number.

c, h, G

Physical Constants

Speed of Light, Planck's Constant, Gravitational Constant

F, L, R

Chemical Constants

Faraday, Avogadro, Gas Constant

i, π or pi, phi

Mathematical Constants

Imaginary Unit, pi, Golden Ratio

To recall a user-defined variable, press the Recall [RCL] key, followed by variable in list that appears.
To store a number into a user-defined variable, press the Store [STO] key, followed by variable in list that appears.
Complex numbers may be stored, but they cannot be used in normal mode.

Preferences

Angle Unit

Adjusts measurement of angles. Applies to infix calculator, RPN calculator, graphs, and tables.

Degrees
Radians
Gradians

Applies to standard trigonometric functions sine, cosine, tangent, arcsine, arccosine, arctangent.
Current angle unit is indicated by last letter on button for each function. E.g.: sinr, cosr, tanr for radians.

Complex Numbers

Enable Complex Numbers. To adjust form of displayed complex numbers...

Fraction Approximations

Estimate fractions when interal fractions cannot be used.

Vibrate

Vibrate when a key is pressed.

Live Calculation

Calculate as an expression is entered. To register an expression, press the Equals [=] button. (Does not apply to RPN mode.)

Errors

Math Errors
Undefined	An attempt was made to divide by zero. Examples: 0/0, 0^-1
Domain	The input of the function is outside the domain of the function. binpdf(2,2,1), ln(-2)
Overflow	Evaluation is outside maximum allowable range. 171!
Nonreal Result	In normal mode, a complex number occurred. sqrt(-2), i
Singularity	Function cannot be evaluated at the given input value. tan(pi/2) [radians]

Math Errors

Undefined

An attempt was made to divide by zero.

Examples:

0/0, 0^-1

Domain

The input of the function is outside the domain of the function.

binpdf(2,2,1), ln(-2)

Overflow

Evaluation is outside maximum allowable range.

171!

Nonreal Result

In normal mode, a complex number occurred.

sqrt(-2), i

Singularity

Function cannot be evaluated at the given input value.

tan(pi/2) [radians]

Syntax Errors
Syntax Error	The expression is not well-formed. Examples: .exp(2 -.+3
Reference	A reference was made to a function or constant that does not exist. In normal mode, a reference to a complex number also causes this error. sind(3)
Invalid Type	A attempt was made to use evaluate a real-only function with a complex argument. nCr(i,1) binompdf(2,.5,sqrt(-1))

Syntax Errors

Syntax Error

The expression is not well-formed.

Examples:

.exp(2
-.+3

Reference

A reference was made to a function or constant that does not exist.

In normal mode, a reference to a complex number also causes this error.

sind(3)

Invalid Type

A attempt was made to use evaluate a real-only function with a complex argument.

nCr(i,1)
binompdf(2,.5,sqrt(-1))

A, B, C, X, Y, Z	User-defined Variables Can be modified by pressing [STO] followed by variable in calculator, or by using the `sto()` function. Can be fractions, complex numbers, and real numbers.
x, y, z, t, v, r, θ m	Volatile Variables Modified by graphing and table features such as tracing. Variables x, y are always modified. Variable `m` (Derivative) is calculated for 2D functions. In 3D function mode, `z` is also modified. In 2D parametric mode, `t` is also modified. In 3D parametric mode, `z`, `t`, and `v` are also modified. In 2D polar mode, `r` and `θ` are also modified. Cannot be fractions or complex numbers.
ANS	Last Answer In Infix Calculator, result of previous calculation is stored in this variable. Can be fraction, complex number, or real number.
c, h, G	Physical Constants Speed of Light, Planck's Constant, Gravitational Constant
F, L, R	Chemical Constants Faraday, Avogadro, Gas Constant
i, π or `pi`, phi	Mathematical Constants Imaginary Unit, pi, Golden Ratio

EvalInfix Calculator

Introduction

Examples

Modes of Operation

Last Answer

Interface

Editing Buttons

Evaluation History

Display Mode

Notes

General Notes

Internal Fractions

Variables and Constants

User-defined Variables

Volatile Variables

Last Answer

Physical Constants

Chemical Constants

Mathematical Constants

Preferences

Fraction Approximations

Errors

Examples:

Examples:

Eval
Infix Calculator