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Dear R Users, I have a network of 25000 total nodes and a list of 500 node which is a subset of all nodes. Now I want to calculate the APSP (all pair shortest path) matrix only for these 500 nodes. I would appreciate any help. Thanks in advance Dinesh -- Dinesh Kumar Barupal Research Associate Metabolomics Fiehn Lab UCD Genome Center 451 East Health Science Drive GBSF Builidng University of California DAVIS 95616 http://fiehnlab.ucdavis.edu/staff/kumar [[alternative HTML version deleted]]

Dear R users, I have a matrix like A X 1 B Y 2 C Z 3 I want to reshape this matrix into this format X Y Z A 1 B 2 C 3 Thanks in advance for your help. Dinesh -- Dinesh Kumar Barupal Junior Specialist Metabolomics Fiehn Lab UCD Genome Center 451 East Health Science Drive GBSF Builidng University of California DAVIS 95616 http://fiehnlab.ucdavis.edu/staff/kumar [[alternative HTML version deleted]]

...4 6 8 8 9 e 5 6 7 8 9 2 3 I want to reshape the matrix in this format Row Col Value a D 4 a E 5 a F 6 . . .. e E 9 I want only the pair which pass a threshold for example >3. Please help me. Dinesh -- Dinesh Kumar Barupal Research Associate Metabolomics Fiehn Lab UCD Genome Center 451 East Health Science Drive GBSF Builidng University of California DAVIS 95616 http://fiehnlab.ucdavis.edu/staff/kumar [[alternative HTML version deleted]]

...94 .00 .00 00 00 95 .00 .67 00 00 96 .00 .87 00 00 Where first column represent the Variable name. And if the first matrix is transposed, then how to get the output in which First raw present the variable name. It will be great help for my research. Dinesh -- Dinesh Kumar Barupal Research Associate Metabolomics Fiehn Lab UCD Genome Center 451 East Health Science Drive GBSF Builidng University of California DAVIS 95616 http://fiehnlab.ucdavis.edu/staff/kumar [[alternative HTML version deleted]]

...I want to extract or subset a child matrix from above with specific row names or col names. e.g. For above matrix I need only rows which has following row names. 5951 236 6306 5950 145742 1123 I would appreciate if you can use this matrix as input. Thanks in advance. Dinesh -- Dinesh Kumar Barupal Research Associate Metabolomics Fiehn Lab UCD Genome Center 451 East Health Science Drive GBSF Builidng University of California DAVIS 95616 http://fiehnlab.ucdavis.edu/staff/kumar [[alternative HTML version deleted]]