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-<HTML><HEAD>
-<TITLE>HDF5 Tutorial - Introductory Topics Quiz with Answers
-</TITLE>
-</HEAD>
-
-<body bgcolor="#ffffff">
-
-<!-- BEGIN MAIN BODY -->
-
-
- [ <A HREF="title.html"><I>HDF5 Tutorial Top</I></A> ]
-<H1>
-<FONT COLOR="#c101cd">Introductory Topics Quiz
- with Answers</FONT>
-</H1>
-
-<hr noshade size=1>
-
-
-<h3>Section 2: HDF File Organization</h3>
-<ol>
-
-<li>Name and describe the two primary objects that can be stored in an HDF5
- file.
-
- <dl>
- <dt><b>Answers:</b>
- <dd><em>Group:</em> A grouping structure containing zero or more
- HDF5 objects, together with supporting metadata.
- <dd><em>Dataset:</em> A multidimensional array of data elements,
- together with supporting metadata.
- </dl>
-
-<p>
-<li>What is an attribute?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>An HDF5 attribute is a user-defined HDF5 structure that provides extra
- information about an HDF5 object.
- </dl>
-
-<p>
-<li>Give the path name for an object called <code>harry</code> that is
- a member of a group called <code>dick</code>, which, in turn, is a
- member of the root group.
-
- <dl>
- <dt><b>Answer:</b>
- <dd><code>/dick/harry</code>
- </dl>
-
-
-</ol>
-<h3>Section 3: The HDF5 API</h3>
-<ol>
-
-<li>Describe the purpose of each of the following HDF5 APIs:
-
- <dir>
- H5A, H5D, H5E, H5F, H5G, H5T, H5Z
- </dir>
-
- <dl>
- <dt><b>Answers:</b>
- <dir>
- H5A: Attribute access and manipulation routines <br>
- H5D: Dataset access and manipulation routines <br>
- H5E: Error handling routines <br>
- H5F: File access routines <br>
- H5G: Routines for creating and operating on groups <br>
- H5T: Routines for creating and manipulating the
- datatypes of dataset elements <br>
- H5Z: Data compression routines
- </dir>
- </dl>
-
-
-</ol>
-<h3>Section 4: Creating an HDF5 File</h3>
-<ol>
-
-<li>What two HDF5 routines must be called to create an HDF5 file?
-
- <dl>
- <dt><b>Answer:</b>
- <dd><code>H5Fcreate</code> and <code>H5Fclose</code>.
- </dl>
-
-<p>
-<li>What include file must be included in any file that uses the HDF5 library?
-
- <dl>
- <dt><b>Answer:</b>
- <dd><code>hdf5.h</code> must be included because it contains definitions
- and declarations used by the library.
- </dl>
-
-<p>
-<li>An HDF5 file is never completely empty because as soon as it is created,
- it automatically contains a certain primary object. What is that object?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>The root group.
- </dl>
-
-
-</ol>
-<h3>Section 5: Creating a Dataset</h3>
-<ol>
-
-<li>Name and describe two major datatype categories.
-
- <dl>
- <dt><b>Answers:</b>
- <dd><em>Atomic datatype:</em>
- An atomic datatype cannot be decomposed into smaller units at the
- API level.
- <br>
- <em>Compound datatype:</em>
- A compound datatype is a collection of atomic and compound datatypes,
- or small arrays of such types.
- </dl>
-
-<p>
-<li>List the HDF5 atomic datatypes. Give an example of a predefined datatype.
-
- <dl>
- <dt><b>Answers:</b>
- <dd>There are six HDF5 atomic datatypes: integer, floating point,
- date and time, character string, bit field, and opaque.
- Examples of predefined datatypes include the following:
- <dir>
- <code>H5T_IEEE_F32LE</code>
- - 4-byte little-endian, IEEE floating point <br>
- <code>H5T_NATIVE_INT</code>
- - native integer
- </dir>
- </dl>
-
-<p>
-<li>What does the dataspace describe? What are the major characteristics of
- the simple dataspace?
-
- <dl>
- <dt><b>Answers:</b>
- <dd>The dataspace describes the dimensionality of the dataset.
- A simple dataspace is characterized by its rank and dimension sizes.
- </dl>
-
-<p>
-<li>What information needs to be passed to the H5Dcreate function, i.e.,
- what information is needed to describe a dataset at creation time?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>The dataset location, name, dataspace, datatype, and dataset
- creation property list.
- </dl>
-
-
-</ol>
-<h3>Section 6: Reading from and Writing to a Dataset</h3>
-<ol>
-
-<li>What are six pieces of information which need to be specified for
- reading and writing a dataset?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>The dataset identifier, the dataset's datatype and dataspace in
- memory, the dataspace in the file, the dataset transfer property
- list, and a data buffer.
- </dl>
-
-<p>
-<li>Why are both the memory dataspace and file dataspace needed for
- read/write operations, while only the memory datatype is required?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>A dataset's file datatype is not required for a read/write operation
- because the file datatype is specified when the dataset is created
- and cannot be changed. Both file and memory dataspaces are required
- for dataset subsetting and for performing partial I/O operations.
- </dl>
-
-<p>
-<li>What does the line
- <br>&nbsp;&nbsp;&nbsp;
- <code>DATASPACE { SIMPLE (4 , 6 ) / ( 4 , 6 ) } </code>
- <br>in Figure 6.1 mean?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>It means that the dataset <code>dset</code> has a simple dataspace
- with the current dimensions (4,6) and the maximum size of the
- dimensions (4,6).
- </dl>
-
-
-</ol>
-<h3>Section 7: Creating an Attribute</h3>
-<ol>
-
-<li>What is an attribute?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>An attribute is a dataset attached to an object. It describes the
- nature and/or the intended usage of the object.
- </dl>
-
-<p>
-<li>Can partial I/O operations be performed on attributes?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>No.
- </dl>
-
-
-</ol>
-<h3>Section 8: Creating a Group</h3>
-<ol>
-
-<li>What are the two primary objects that can be included in a group?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>A group and a dataset.
- </dl>
-
-
-</ol>
-<h3>Section 9: Creating Groups Using Absolute and Relative Names</h3>
-<ol>
-
-<li>Group names can be specified in two ways. What are these two types
- of group names?
-
- <dl>
- <dt><b>Answer:</b>
- <dd>Relative and absolute.
- </dl>
-
-<p>
-<li>You have a dataset named <code>moo</code> in the group
- <code>boo</code>, which is in the group <code>foo</code>,
- which, in turn, is in the root group.
- How would you specify an absolute name to access this dataset?
-
- <dl>
- <dt><b>Answer:</b>
- <dd><code>/foo/boo/moo</code>
- </dl>
-
-
-</ol>
-<h3>Section 10: Creating Datasets in Groups</h3>
-<ol>
-
-<li>Describe a way to access the dataset <code>moo</code> described in
- the previous section (Section&nbsp;9, question&nbsp;2) using a
- relative name.
- Describe a way to access the same dataset using an absolute name.
-
- <dl>
- <dt><b>Answers:</b>
- <ol>
- <li>Access the group <code>/foo</code> and get the group ID.
- Access the group <code>boo</code> using the group ID obtained
- in Step&nbsp;1.
- Access the dataset <code>moo</code> using the group ID obtained
- in Step&nbsp;2.
- <pre>
-gid = H5Gopen (file_id, "/foo", 0); /* absolute path */
-gid1 = H5Gopen (gid, "boo", 0); /* relative path */
-did = H5Dopen (gid1, "moo"); /* relative path */ </pre>
-
- <li>Access the group <code>/foo</code> and get the group ID.
- Access the dataset <code>boo/moo</code> with the group ID
- just obtained.
- <pre>
-gid = H5Gopen (file_id, "/foo", 0); /* absolute path */
-did = H5Dopen (gid, "boo/moo"); /* relative path */ </pre>
-
- <li>Access the dataset with an absolute path.
- <pre>
-did = H5Dopen (file_id, "/foo/boo/moo"); /* absolute path */ </pre>
- </ol>
- </dl>
-
-</ol>
-
-<!-- BEGIN FOOTER INFO -->
-
-<P><hr noshade size=1>
-<font face="arial,helvetica" size="-1">
- <a href="http://www.ncsa.uiuc.edu/"><img border=0
- src="footer-ncsalogo.gif"
- width=78 height=27 alt="NCSA"><br>
- The National Center for Supercomputing Applications</A><br>
- <a href="http://www.uiuc.edu/">University of Illinois
- at Urbana-Champaign</a><br>
- <br>
-<!-- <A HREF="helpdesk.mail.html"> -->
-<A HREF="mailto:hdfhelp@ncsa.uiuc.edu">
-hdfhelp@ncsa.uiuc.edu</A>
-<br>
-<BR> <H6>Last Modified: June 22, 2001</H6><BR>
-<!-- modified by Barbara Jones - bljones@ncsa.uiuc.edu -->
-</FONT>
-<BR>
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