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Site last modified: 2015-Apr-25 |

Logic Calculator:

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Complex Linear System Equation Solver: - you can use complex coefficients in form of (re,im)

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Polynomial Root Solver: Lin-Bairstow method

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Complex Polynomial Root Solver: - you can use complex coefficients in form of (re,im)

uses Modified Durand-Kerner-Weierstrass Method (iterated)

if you are expecting integer results, try hitting the solve button several times to reset the initial guesses

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To use Scientific Calculator RPN (Reverse Polish Notation) button operators
(Complex operation capable): For unary operations (1 number req.), type the number into the input box and then click the function. For binary operations (2 numbers req.) type the 1st number, click the [Enter] button, type the 2nd number, and then click the function. For short-cut RPN operations (like HP calculator logic), you can use operators directly on the stack as well. Unary operations replace the last stack value with its new value Binary operations replace the last two stack values with its new value Just play with the buttons, the log window will let you see how it works -- its pretty easy once you get the hang of it... To use built-in javascript DAL (Dynamic/Direct Algebraic Logic) operations (Real operations only): Write your numeric equation/formula directly into the input box and then press [Enter] (you don't have to write the JS 'Math.' in front of the functions, but you can only use and receive real numbers): ex. 2+5/3-abs(-8)*cos(PI) you must input angles in radians when using this mode Note: you must have the [kbd] checkbox OFF to use DAL To input numbers, there are several options, all of which are effective: (1) mouse-click on the virtual number pad above (2) use copy-paste/select-drag from the log window to the input box (3) just type in the numbers on your computer keyboard (4) turn on the [kbd] checkbox to make the actual keyboard activate the (+,-,*,/,=,c) virtual keys in RPN mode Input types: real 255 or PI or -234.2235 or etc. complex pair (0,3) or (2,3) or (-2,3) etc. complex add 0 +i 3 or 2 +i 3 or -2 +i 3 etc. imaginary 3i or 2+3i or -2+3i or 2+3I etc. complex polar 3 /_ 90 or 3 /_ 1.5708 (set the angle mode 1st) num-to-base FF_b16 or 1001010_b2 list of complex {2;(3,4.5);4.46;(5,3);3;4;(5.23,-4.84);2} Javascript numbers: octal integer ±0### 0345 -> 229 decimal -0345 -> -229 decimal hexadecimal integer ±0x### 0x345 -> 837 decimal -0x345 -> -837 decimal To page through the available functions: Keep clicking the [Fncs] key Warning: Apparently, javascript only uses about 16 digits of precision, so take results of huge numbers with a grain of salt... |

To use Javascript Math functions in input field: | === | To use Javascript operators in input field (listed in precedence order): | ||

Math.abs(x) | Absolute value of x | ( , ) |
Parentheses for grouping | |

Math.acos(x) | Arc cosine of x | ~ |
Bitwise complement | |

Math.asin(x) | Arc sine of x | ! |
Logical complement | |

Math.atan(x) | Arc tangent of x | typeof |
Return data type | |

Math.atan2(y,x) | Argument from +x axis | * , / , % |
Multiply , Divide , Remainder | |

Math.ceil(x) | Ceiling of x | + , - |
Add , Subtract | |

Math.cos(x) | Cosine of x | + |
Concatenate strings | |

Math.exp(x) | Natural exponent of x | << |
Integer shift left | |

Math.floor(x) | Floor of x | >> |
Integer shift right, sign extension | |

Math.log(x) | Natural logarithm of x | >>> |
Integer shift right, zero extension | |

Math.max(args...) | Max of list of values | < , <= |
Less than , Less than or equal | |

Math.min(args...) | Min of list of values | > , >= |
Greater than, Greater than or equal | |

Math.pow(x,y) | x to the y power | == |
Test for equality | |

Math.random() | Random number (0..1) | != |
Test for inequaltiy | |

Math.round(x) | Round of x | === |
Test for identity | |

Math.sin(x) | Sine of x | !== |
Test for identity | |

Math.sqrt(x) | Square root of x | & |
Integer bitwise AND | |

Math.tan(x) | Tangent of x | ^ |
Integer bitwise XOR | |

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Integer bitwise OR | |||

Math.E | Natural exponent E | && |
Logical AND | |

Math.LN10 | Natural logarithm of 10 | || |
Logical OR | |

Math.LN2 | Natural logarithm of 2 | ?: | Conditional operator "condition"?"if true":"if false" | |

Math.LOG10E | Base-10 log of E | |||

Math.LOG2E | Base-2 log of E | |||

Math.PI | Circle constant PI | |||

Math.SQRT1_2 | Square root of 1/2 | |||

Math.SQRT2 | Square root of 2 |

Note: if anyone notices a bug in the calculator, please report it so that I can fix it

And, just an interesting bit of math trivia:

Addition is repeated incrementing ( c = a+b ); the 2 inverses are subtraction. ( a = c-b ) & ( b = c-a )

Multiplication is repeated addition ( c = a*b ); the 2 inverses are division. ( a = c/b ) & ( b = c/a )

Exponentiation is repeated multiplication ( c = a^b); it has 2 different inverses: the root ( a = Root

Isn't this branching pretty cool, considering that mathematics has a tree-like structure? :-)

Contest: Who can tell me what is special about 0.20787957635076193?

Hint: it can be derived using a single simple "unit" number and one single operation from above.

An introduction to complex numbers

Problems about Complex numbers

If you have a comment about this site, or find a bug, or want more features added, or just want to say 'hi', please email John.