From: Arjen Markus <arjen.markus@wl...>  20071210 08:53:46

> Dear all: > > I would like to plot vectors in general curve coordinate as attached > picture. Of course I have already try to be plotting with plvec2. > When I gave the vector data which is u =1.0 and v=0.0, the plotted > vectors look like along coorthogonal coordinate. > > I think that plplot has the vector plotting function in general curve > coordinate because I read the reference of plplot and sample code of > x22f. Can we plot that things? > Hello Hiro, that means that the components of the vector are not cartesian but based on the (local) coordinate system (or grid orientation)? That means that PLplot will have to keep track of this more general coordinate system. Isn't it simpler to convert the components from the curve coordinate system to the cartesian plotting coordinates? For instance, in the case of polar coordinates: u = R cos phi v = R sin phi where R and phi are the polar components of the vector. Regards, Arjen 