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...call()), "\nDummy names have been assigned."); } After all, e.g. data.frame () will also rather create dummy names for unnamed columns. And, I think, a warning should make the user aware that he's doing something that _may_ not work out as intendet. But here I think it is _most likely_ not working as intended. > MISCELLANEOUS: > Note that writeMat() cannot write compressed MAT files. It is > documented in help("readMat"), and will be so in help("writeMat") in > the next release. Package Rcompression, loaded or not, has no effect > on writeMa...