Complex Expression
Calculator: Last updated on:
07/18/2008
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Version 1.3b
Version 1.4: This web tool evaluates any real and
complex expression. Besides the usual operators like +,-,*,/,%,^ you can
also use the built in functions:
abs, acos*, asin*, atan*, atan2*, ceil*, cosh, cos, exp, floor*, log, max*, min*, pow, random*, round*, sinh, sin, sqrt, tanh, tan.
*) marked are functions that only takes real arguments, all other takes
real or complex arguments. e.g. sqrt(2-i2) evaluates to approx.
(1.55+i0.64).
The operator ^ is the power operator. However it only takes an integer
argument like the expression sqrt(2)^2. For more complex power operations
use the general power function: pow() instead.
You can also assign expression to a variable: e.g. x=sqrt(2-i2)*3/4 and
then used them later on. E.g. y=log(123.5)/x etc. In version 1.2 we have
added functions. First you would need to define a function like in the
following:
f(x)=2*sqrt(x)
and then just call then with a parameter e.g.: 3*log(f(4))
A function can also contains compound statements. e.g. f(x)={ x=2; y=3;
z=5; } etc
You can have as many parameter as you like however number of parameter
passed must match the definition of the functions.
Example: Durand-Kerner method on a polynomial f(x)=x^3-3*x^2+3*x-5
Add each line to the input field and it evaluate. Then type in next()
and see the value of the roots for each iterations.
p=(0.4 + 0.9 i)^0, q=(0.4 + 0.9 i)^1, r=(0.4 + 0.9 i)^2
f(x)=x^3-3*x^2+3*x-5
next()={dp=f(p)/((p-q)*(p-r)); p=p-dp; dq=f(q)/((q-p)*(q-r));q=q-dq;dr=f(r)/((r-p)*(r-q));r=r-dr;}
If you refresh your browser or exit you loose all variables.
The Histroy section keeps track on your previous expression evaluations.
Email me if you encounter any problems at hve@hvks.com
Corrections:
18-Jul-2008
Vs 1.4
Works with IE7,
FireFox 2 & 3
18-Jun-2008
Vs 1.3
Added Comma
expression, Statements and compound statements
11-Jun-2008
Vs 1.2
Added support for
define and calling user defined functions with zero
or more parameters
