option to pick decimal mark between comma and dot

I would recommend you design a feature into the calculator where users could make it behave like one of the classic Hewlett Packard calculators. I find the reverse polish notation to be much faster for carrying out computations.

Your trig functions are wack . . .

let git it back

I made a function in script "length(x,y) = sqrt((x^2)+(y^2))".
When I typed in "plot(length(x,2))".
I received this error "Error: Unexpected operator ) (char 2)"

Also "plot(sin(x*0.2))" makes a sine wave with some spiky lines that aren't supposed to be there.
Image:
http://postimg.org/image/7jdl8mcv3/

this is needed for more algebra

"plot(cos(t*tau),sin(t*tau),0:1,0.01)" makes a circle.
Like in Desmos: http://postimg.org/image/49tw1bytr/

In script:
this.functions=[
"plot1(x) = plot(x,0:1,0.002)"
];

In calculator:
"plot1(fract(x*2))"

Error:
": Error. Undefined symbol plot1"

Executing the same function within a function makes a "not defined" error message

Please keep the green background from changing to black. It's hard to see what you're typing!!! I'm using chrome.

Im not sure if it is missing or I just cant find it but I cant find the function that switched fromdeg to rad and vise versa

log(8,2) returns 2.9999999...
log(32,2) returns 4.999999...
log(27,3) returns 2.999999...
log(125,5) returns 3.00000...
etc.

While technically not incorrect, this makes copy/pasting tedious, etc.