How do I extract the original waves making up a contour map.
Igor_user
Mon, 07/26/2010 - 09:59 pm
I have a contour map that is created directly from a .nx.hdf data file.
The contour has data in 3 dimensions, X-coordinate, Y-coordinate and Z-the intensity
How do I browse up the original waves from this hdf file.
July 26, 2010 at 10:56 pm - Permalink
Yes it is,
The HDF5 browser generates a list of all the Nexus files with each corresponding to a particular 2D contour the intensity of which is indicated by a color bar.
I tried to right click on the contour to browse the original data waves from it. But there isn't any way I can do it.
If you have done the same thing before, can please give me the steps through which you extracted your original waves?
July 26, 2010 at 11:34 pm - Permalink
July 27, 2010 at 12:22 am - Permalink
Yep, here it's!
July 27, 2010 at 02:50 am - Permalink
1) install the HDF5 xop (place a shortcut to the Igor Pro Folder/More Extensions/File Loaders/HDF5.xop file in Igor Pro Folder/Igor Extensions)
2) install the HDF5 Browser.ipf file (place a shortcut to the Igor Pro Folder/Wavemetrics Procedures/File Input Outpus/HDF5 Browser.ipf file in Igor Pro Folder/Igor Procedures)
3) Restart Igor
4) Select the "Data->Load Waves->New HDF5 Browser" menu option
5) Press "Open HDF5 file", select your HDF5 file.
6) In the Groups box on the left hand side navigate to the root:entry1:data path. In the datasets box on the right hand side select the hmm_xy dataset. Press "Load Dataset".
7) You'll get the data loaded and displayed in a graph.
In any case please PM me, if you're at ANSTO I can show you how to do this personally.
Andy
July 27, 2010 at 03:36 am - Permalink
Hi Andy,
Have I got something missing here?
Becuase I didn't actually run the experiment myself, the files were given to me from my colleague who sent his samples away for the experiment before he left.
July 27, 2010 at 05:41 am - Permalink
The steps above will load the hmm_xy wave. If you look at the picture you just posted you will see that the Dim Sizes for hmm_xy are 1;192;192. If you look at the Dataset Attributes you'll see that the last two indices in that dataset are y and x. The purpose of a 3D array instead of a 2D array is to provide the ability to store multiple detector images in a single array (e.g. if you do a scan).
To get the data in a 2D format do the following:
detector2D[][] = hmm_xy[0][q][p]
Then you can plot in 2D to your hearts content. You can, of course, load the dataset and do the conversion programmatically, it's just a little more involved.
July 27, 2010 at 04:05 pm - Permalink