[Plplot-general] still problems with plgriddata() :(

[<WH...@bf...>]

hi,
i have still problems with these grid data stuff. perhaps i am on
the wrong way ?

here  is a shortcut of my problem:
/* count 2D-points with value Z */ 

count=20;
 for(i=0;i<count;i++) {
    pnt[i].x= (PLFLT) (rand()%100); /* 0...99 */
    pnt[i].y= (PLFLT) (rand()%100); /* 0...99 */
    pnt[i].z= (PLFLT) (rand()& 1);        /* 0,1    */
  }



my impression was that plgriddata() das the magic to move [x,y,z] -> z[a][b]
/* 
org line from my trial X,Y,Z is the array with the original data
dY,dX,dZ is the (display)data
*/
plgriddata(X,Y,Z,count,dX,count,dY,count,dZ,alg,GRID_CSA);

I exspected now a mesh (or something like that) with:
plot3d(dX,dY,dZ,count,count,DRAW_LINEXY,0);

I did saome other experiments but obviously i got something seriously wrong :(

regards,
walter