The pixel image using maximum value and minimum value
subroutine pixel1(nx,ny,xb,yb,xl,yl,ipx0,ico,icc,zcc,vmin,vmax,u)

Description: This program draws pixel image using maximum value (vmax) and minimum value (vmin) of u(i1) are given from the outside, u(i1) is normalized, and by giving position in the origin and length of one side, data number, colored code, the image of two-dimensional data u(nx*ny). 

Input variable:
      nx : Data number of the x direction
      ny : Data number of the y direction
      xb : The x coordinate of the origin
      yb : The y coordinate of the origin
      xl : The length of the x direction
      yl : The length of the y direction
      ipx0 : 3=rgb color, 4=rgb color and transparency can be set
      ico : color code [1,7]
      icc : Picture is drawn in the 1=xy plane, 2=xz plane, 3=yz plane
      zcc : The position in chosen plane 
      u (nx*ny) : Input data
      vmin : The maximum value of u(i1) given from the outside 
      vmax : The minimum value of u(i1) given from the outside 
      u (nx*ny) : Input data u(i1), i1=i+nx*(j-1)
Main using subroutine:
      pixebe(nx,ny,ipx0) : The start of the pixel image 
      pixeco(nx,ny,ico,u) : The setting of the rgb color
      pixect(nx,ny,ico,u) : The setting of transparency and rgb color
      pixeen(xb,yb,xl,yl,icc,zcc) : The end of the pixel image