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imquickthresh
2001 Mar 01
0
Finalization and external pointer objects
...t;. This is actually a pointer to a C
abstract data type. Most imaging functions in my library have a form
like this
IMAGE *imquickthresh(const IMAGE *src, IMAGE *target, float p1, int p2);
the target parameter is optional and never used from R.
This is made appropriate for a .C call like this
Rimquickthresh(IMAGE **output, IMAGE **src, Sfloat *p1, Sint *p2)
{
IMAGE *dummy;
dummy = imquickthresh(*src, NULL, (float)(*p1), (int)(*p2));
*output = dummy;
}
the R code calling this looks like
function(src, p1, p2)
{
if (!is.image(src))
stop("Parameter 'src' should be an image.&qu...