" size="80%" onchange='javascript:plot3d("evaluator")' >

This calculator calculates JavaScript numerical expressions and runs JavaScript code,
and plots and visualizes JavaScript functions over the real domain.
The independent variable must be typed as **x** for evaluation. Type an expression into the box and press Enter key in your keyboard to evaluate.

For example:

- x=2; x^2

assign 2 to x, then calculate x^2. - f(x)=x^2; f(2)

define function f(x), then calculate f(2). - integrate(x=>sin(x),[1,2])

calculate integration sin(x) from 1 to 2, more calculus operations are in JavaScript calculus, where f is JavaScript function, e.g. x=>sin(x) - g=[1,2]; g.reverse()

reverse the order of elements in list g. List, vector, matrix and array are the same as array in JavaScript. - g=[[1,1],[1,2]]; inverse(g)

inverse matrix, more matrix operations are in matrix calculator. - sin(x-timer(9))

for animation, add the timer(t) function and change animation speed by the different t value. - ds(x=>sin(x),x,0.5)

plot the 0.5 order derivative = semi derivative - ds(x=>sin(x),x,-0.5)

plot the -0.5 order derivative = semi integral - matrix calculator and math calculator and web editor can run more JavaScript code.