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From: Hiroyasu Yasuda <hyasuda@ce...>  20071210 23:11:42

On 2007/12/10, at 23:41, Andrew Ross wrote: > On Mon, Dec 10, 2007 at 11:11:42PM +0900, Hiroyasu Yasuda wrote: >> >> On 2007/12/10, at 17:53, Arjen Markus wrote: >> >>>> 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 Arjen: >> >>> that means that the components of the vector are not cartesian >>> but based on the (local) coordinate system (or grid orientation)? >> >> Yes, that is, I have been computing with local coordinate system. >> >>> 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? >> >> When I'm computing and then plot the vectors with local coordinate >> system, do we have to convert the vector component to plot the >> vectors along local coordinate under plplot? > Hello, Andrew: > The vector components are always assumed to be cartesian. As Arjen > said, if you want to use local coordinates for the vector components, > you need to convert them to cartesian cordinates before plotting. I understand that you mention. However, the plplot reference of plvec2 in Chapter 20 said that: NOTE: this function is intended for use from a Fortran 77 caller only. The C user should instead call plvect using the builtin transformation function pltr2 for the same capability. Can we plot directly the vectors along curve coordinate with plvec2 ? Regards, Hiro 
From: Andrew Ross <andrewross@us...>  20071210 14:41:48

On Mon, Dec 10, 2007 at 11:11:42PM +0900, Hiroyasu Yasuda wrote: > > On 2007/12/10, at 17:53, Arjen Markus wrote: > > >> 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 Arjen: > > > that means that the components of the vector are not cartesian > > but based on the (local) coordinate system (or grid orientation)? > > Yes, that is, I have been computing with local coordinate system. > > > 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? > > When I'm computing and then plot the vectors with local coordinate > system, do we have to convert the vector component to plot the > vectors along local coordinate under plplot? Hiro, Although you can specify noncartesian coordinates to plot vectors at, for example using pltr2 as in the last plot of example 22, this only specifies the location of the vectors. The vector components are always assumed to be cartesian. As Arjen said, if you want to use local coordinates for the vector components, you need to convert them to cartesian cordinates before plotting. Andrew 
From: Hiroyasu Yasuda <hyasuda@ce...>  20071210 14:12:15

On 2007/12/10, at 17:53, Arjen Markus wrote: >> 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 Arjen: > that means that the components of the vector are not cartesian > but based on the (local) coordinate system (or grid orientation)? Yes, that is, I have been computing with local coordinate system. > 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? When I'm computing and then plot the vectors with local coordinate system, do we have to convert the vector component to plot the vectors along local coordinate under plplot? Regards, Hiro 
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 
From: Hiroyasu Yasuda <hyasuda@ce...>  20071210 08:31:07

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? Regards, Hiro 