save data in the hdf5 format and can not process the h5 file using h5topng

[thorneliu]

   Hello, there!!
   I get some data in octave and i wanna save the data in the hdf5 format
which can be 
processed by the h5utils in my Debian GNU/Linux.
   For example:
   E is a matrix in octave;
   >size(E)
  ans =

   221   221
 >save -hdf5 Eplane.h5 E
So, I get the file Eplane.h5 in my directory.
In order to test the data in this h5 file, I restarted octave
and load the h5 file.
 > load Eplane.h5; 
 >who
 ...... 
 E

And I think that the data is corectily save in the h5 file.

However, when i use the h5topng command in my shell
xxx$: h5topng -S3 -Zc dkbluered Eplane.h5
h5topng error: couldn't find data set in HDF5 file.

I got the error and i do not know what to do.
Is there anyone knows what was wrong ?
Thanks.

ps： I found that in my octave, using the save command in the following ways:
1. save -hdf5 output.h5 E
2. save("-hdf5","output.h5","E")
can lead to different results.
When i load the saved data files to octave
The first command will return me the right data type: matrix 
while the second return me a data type: struct
 Is this normal ?

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