Re: [Plplot-general] vector field

[Paulo C. <co...@as...>]

Hi

thanks for the reply I wasn't that explicit because I wasn't sure if the
list was alive :). Here is little piece of my code. 
PMap(i,j).getDensity() is an angle (polarization angle). I get the shape 
that I should; except for a line like this:

|      *
|    *
|  *
|*
_ _ _ _

in front of the vector field. Thanks!!!

Paulo

ps. Is it politically correct to include an image as an attachment?
so I can include my problem?


      nx=33;ny=33;nz=33;
      for (j = 0; j<ny; j++) {
         for (i = 0; i<nx; i++) {
             x = (i-nx/2)*dx;
             y = (j-ny/2)*dy;
             cgrid2.xg[i][j] = (i-nx/2);
             cgrid2.yg[i][j] = (j-ny/2);
             printf("y=%3.1f z=%3.1f Qmap=%3.8f Umap=%3.8f\n",y,z,
                     QMap(i,j).getDensity(),UMap(i,j).getDensity());
             fpol   = 
sqrt(QMap(i,j).getDensity()*QMap(i,j).getDensity()+
                        UMap(i,j).getDensity()*UMap(i,j).getDensity())/
                        IMap(i,j).getDensity();
             u[i][j]= fpol*cos(PMap(i,j).getDensity());
             v[i][j]= fpol*sin(PMap(i,j).getDensity());
                 pp = sqrt(u[i][j]*u[i][j] + v[i][j]*v[i][j]);
         }
     }


     pls->env(xmin, xmax, ymin, ymax, 0, 0);
     pls->lab("(x)", "(y)", "#frPLplot B field");
     pls->col0(2);
     pls->vect(u,v,nx,ny,1.0,plstream::tr2,(void *)&cgrid2);
     pls->col0(1);


Andrew Ross wrote:
> On Thu, Oct 14, 2004 at 04:20:53PM -0500, Paulo Cortes wrote:
> 
>>Hi
>>
>>I am using plplot to plot  a vector field, but
>>am having problems. I get the vector field, but I also
>>get a line that goes from the lower left corner to the
>>upper right corner of the plot, I can't get rid of it.
>>any ideas?
> 
> 
> Could it possibly be your array size is not quite right?  Otherwise it 
> is hard to tell from your description. Can so provide us with a simple 
> example code?
> 
> Andrew
> 
> 
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