Hi All,
(I'm new to HDF so this may be a noobie question). I'm working over large datasets, ordered as datatables. The data is date-time ordered what makes easier to find the datalines I want. After find the datalines I'm selecting those lines with hyperslabs (line by line to work over them), but I've found a situation where would be really useful to have a selection of the whole lines I want (with an hyperslab) and the get the dataspaces line by line from that zone selection. Is there any way to do that without creating a temporary dataset with the big selection and work over it there? (a single note: i'm not working with any higher level API, I'm just including hdf5.h from HDF5 1.8.9 version) ____ In case i'm not explaining myself properly above, here goes a simplified example: [1]- I have some data lines _______________________ |_____|______|_____|_____| |_____|______|_____|_____| <<< (select line) |_____|______|_____|_____| <<< (select line) |_____|______|_____|_____| <<< (select line) |_____|______|_____|_____| [2]- I want to update data in the lines marked with "<<<", so i'm selecting that datalines with hyperslabs (in the real case there would be not 3 lines, but far more lines, so I'm selecting the space with an hyperslab, read the current line, update the data I want, and then overwrite the slab space with the new data): |__a__|___b__|__c__|__d__| >> read to struct data >> operate over it (update b to g, c to h ) >> overwrite the slab selected space >> |__a__|__g___|__h__|__d__| [3]- But in a situation here would be really useful to select all the zone I want: |_____|______|_____|_____| | |_____|______|_____|_____| |<<< (select zone) |_____|______|_____|_____| | and then iterate it, performing the action described in [2] for each line. But to do that I would have to get a "line selection" from the "zone selection" and then tell the zone space I have new data in certain lines... so here is the point I'm not being able to do, but it would easy once I was able to create a "selectable" space working as a virtual dataset but only with the datalines I need. my thanks, Saulo
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