Hello, All:
What references exist on how to link to C?
I'm familiar with sections 5.2 and 5.6 of the "Writing R
Extension" manual plus chapter 6 of Venables and Ripley (2000) S
Programming (Springer). From these, I get the following:
R storage mode C type
logical int *
integer int *
double double *
complex Rcomplex *
character char **
raw unsigned char *
list SEXP *
R object SEXP
"integer" and "int" are 32 bits. If I understand correctly,
"short" has only 16 bits = 2 bytes.
Should I define any "short" vector in C as a matrix with 2 rows
of type either "raw" or "char"?
Thanks,
Spencer
p.s. I need this to link to lossless JPEG code obtained from
"ftp.cs.cornell.edu/pub/multimed/ljpg.tar.Z"
--
Spencer Graves, PE, PhD
President and Chief Technology Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San José, CA 95126
ph: 408-655-4567
web: www.structuremonitoring.com
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