Emmy - a math interpreter

Emmy supports a subset of mathematical methods and operations and is intended to compute simple mathematical expressions.

Warning

Emmy is a work in progress, currently only a subset of the Reference is implemented

Name

Emmy is named after Emmy Noether, a german mathematician who contributed to abstract algebra.

Usage

Invoke emmy without any arguments to start the repl and with an argument to instantly get the computed result:

$ emmy "25+25"
= 50

the emmy shell is prefixed with ε>

Welcome to the emmy repl
ε> 25+25
= 50.0

Reference

Emmy is interpreted on a line by line basis, hitting enter will make emmy forget everything put in before.

REPL - commands

Welcome to the emmy repl
ε> .help
.exit      quits the repl
.debug     toggles debug mode
.cls       clears the screen
.help      prints this message

ε>

Operations

Name	Symbol	Description	Example
Addition	+	Adds the preceding and the succeeding operands	1+2 = 3
Subtraction	-	Subtracts the succeeding operand from the preceding operand	3-1 = 2
Multiplication	*	Multiplies the preceding operand by the succeeding operand	2*2 = 4
Division	/	Dividies the preceding operand by the succeeding operand	4/2 = 2
Modulo	%	Dividies the preceding operand by the succeeding operand, returns remainder, read more here	16%15 = 1
Power	^	Raises the preceding operand to the power of the succeeding operand	2^7 = 128

Constants

Name	Symbol	Description	Example
π	@pi	holds the value of pi	@pi = 3.1415...
e	@e	holds the value of e	@e = 2.7182...
phi	@phi	holds the value of phi	@phi = 1.6180...

Functions

x,y represent the functions arguments

Name	Symbol	Description	Example
sqrt	@sqrt{x}	calculates the square root of x	@sqrt{25} = 5
sin	@sin{x}	calculates the sinus of x	@sin{5}= -0.132352
cos	@cos{x}	calculates the cos of x	@cos{5}= 0.991203
tan	@tan{x}	calculates the tan of x	@tan{5}= -0.133526
lb	@lb{x}	calculates the binary logarithm (log_2) of x	@lb{5}= 2.321928
ln	@ln{x}	calculates the natural logarithm (log_e) of x	@ln{5}= 1.609438
lg	@lg{x}	calculates the common logarithm (log_10) of x	@lg{5}= 0.69897

Planned features

• convert to other number representations:
  • binary
  • hexadecimal
  • octal
  • base32
  • base64
• bit operations (and, or, xor, nor)
• arc functions:
  • arccos
  • arcsin
  • arctan