I have tried to plot equation in RC 2.2.0 RC1. It is done from menu "Plugin-->Plot Plugin". Then I entered two equations as picture below, with the range and step. Unfortunately, the result was not as what I expected. In my opinion, the result should be like the 3rd picture, which I did it in MS Excel. All using the same equation: 100*(Sin(x*pi/180)+Cos(x*pi/180)).
Is anyone has experience to do equation?
My intention actually supposed to be more complex, like to plot guitar or violin body which the shape is based on a mathematics formula rather than plot in manual manner.
I have no experience with this plugin, but after a look at the source code, I figured it out.
You have to call the plugin for each curve with a single equation like this:
Then use the cos() equation and the sin() + cos() equation with same start/end/step parameters.
With two equations the first one is used for X values and the second for Y values.
This explains your result, you have a circle with radius 100.
Check this with start=0, end=180, this results in a half circle.