[GRASS-dev] How to: if undefined, set to NULL?

[Nikos Alexandris]

While modifying i.rgb.his,

   if (chroma == 0.0) {

       saturation = 0.0;

       /* undefined -- (how to) set to NULL? */
       hue = 0.0;

       rowbuffer[0][sample] = (FCELL)hue;
       rowbuffer[1][sample] = (FCELL)intensity;
       rowbuffer[2][sample] = (FCELL)saturation;
   }


I'd like to set hue to NULL, whenever the condition is met. How do I do that?

   hue = NULL;

does not work.

Thanks for any help, Nikos
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