grapher
I understand the the Grapher app in Mac OS X comes with erf and erfc, the error function and complementary error function. However, when I define
y = Re[erfc(-ix)],
the Grapher app just returns y(x) = 0 for all values of x. Is it not possible to give this function complex values?
First select both equations in the sidebar, and then Equation » Integration… in the menu.
In the dialog, it has preselected Area Between Curves. Confirm it.
You can change the color in the inspector window.
Since your second equation is y=0, you could just select the first one, and integrate it, selecting Area in the dialog. The result should look the same.
Well, the problem is that Grapher assuming that the x in f(x)=x^2 means the x coordinate.
To fix this problem, you should change the x to some other variable (say z).
I know, Grapher is weird sometimes.
Best Answer
You may well find that somewhere in there the complex number is being flattened and you will need to use the complex() function to protect it from that.
Check this out :-
http://acko.net/blog/taming-complex-numbers-in-grapher-app/