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4711 6929 d 22 h maechler /trunk/Matrix/ add more x  
4639 6948 d 20 h maechler /trunk/Matrix/ norm() for sparse; systematic checking of norm() and all "Summary" methods  
4501 6973 d 16 h maechler /trunk/Matrix/ xsparseVector etc (smarter coercions)  
4483 6977 d 18 h maechler /trunk/Matrix/ colSums, ... rowMeans for all Matrices; notably sparse ones via [diln]gCMatrix_colSums C code  
4386 7004 d 13 h maechler /trunk/Matrix/ export drop0() {name is open for discussion}; document colSums