Hello, I'm trying to use the rhdf5 package to read and iterate in a hdf5 database. The structure of the database is of a simple table of 13 columns with two of them being indexes. I'm not being able to find out how to use the indexes to find the information I need. That is, I think i need to access the timestamp index and return a value to be inserted in the h5read function at the index field. Dunnow if i'm using the best function because I haven't found on the web an example so complicated. Best regards, Maria Pedroto -- output of sessionInfo(): h5ls(filename, datasetinfo=TRUE) group name otype dclass dim 0 / _i_events H5I_GROUP 1 /_i_events msisdn H5I_GROUP 2 /_i_events/msisdn abounds H5I_DATASET INTEGER 105408 3 /_i_events/msisdn bounds H5I_DATASET INTEGER 287 x 366 4 /_i_events/msisdn indices H5I_DATASET INTEGER 4718592 x 366 5 /_i_events/msisdn indicesLR H5I_DATASET INTEGER 4718592 6 /_i_events/msisdn mbounds H5I_DATASET INTEGER 105408 7 /_i_events/msisdn mranges H5I_DATASET INTEGER 366 8 /_i_events/msisdn ranges H5I_DATASET INTEGER 2 x 366 9 /_i_events/msisdn sorted H5I_DATASET INTEGER 4718592 x 366 10 /_i_events/msisdn sortedLR H5I_DATASET INTEGER 4718881 11 /_i_events/msisdn zbounds H5I_DATASET INTEGER 105408 12 /_i_events timestamp H5I_GROUP 13 /_i_events/timestamp abounds H5I_DATASET STRING 105408 14 /_i_events/timestamp bounds H5I_DATASET STRING 287 x 366 15 /_i_events/timestamp indices H5I_DATASET INTEGER 4718592 x 366 16 /_i_events/timestamp indicesLR H5I_DATASET INTEGER 4718592 17 /_i_events/timestamp mbounds H5I_DATASET STRING 105408 18 /_i_events/timestamp mranges H5I_DATASET STRING 366 19 /_i_events/timestamp ranges H5I_DATASET STRING 2 x 366 20 /_i_events/timestamp sorted H5I_DATASET STRING 4718592 x 366 21 /_i_events/timestamp sortedLR H5I_DATASET STRING 4718881 22 /_i_events/timestamp zbounds H5I_DATASET STRING 105408 23 / events H5I_DATASET COMPOUND 1729572595 -- Sent via the guest posting facility at bioconductor.org.