Table Of Content

MatLab Data Import and Export © COPYRIGHT 2009–2018 by The MathWorks, Inc. Revision History September 2009 Online only New for MATLAB 7.9 (Release 2009b) March 2010 Online only Revised for Version 7.10 (Release 2010a) September 2010 Online only Revised for Version 7.11 (Release 2010b) April 2011 Online only Revised for Version 7.12 (Release 2011a) September 2011 Online only Revised for Version 7.13 (Release 2011b) March 2012 Online only Revised for Version 7.14 (Release 2012a) September 2012 Online only Revised for Version 8.0 (Release 2012b) March 2013 Online only Revised for Version 8.1 (Release 2013a) September 2013 Online only Revised for Version 8.2 (Release 2013b) March 2014 Online only Revised for Version 8.3 (Release 2014a) October 2014 Online only Revised for Version 8.4 (Release 2014b) March 2015 Online only Revised for Version 8.5 (Release 2015a) September 2015 Online only Revised for Version 8.6 (Release 2015b) October 2015 Online only Rereleased for Version 8.5.1 (Release 2015aSP1) March 2016 Online only Revised for Version 9.0 (Release 2016a) September 2016 Online only Revised for Version 9.1 (Release 2016b) March 2017 Online only Revised for Version 9.2 (Release 2017a) September 2017 Online only Revised for Version 9.3 (Release 2017b) March 2018 Online only Revised for Version 9.4 (Release 2018a) Contents File Opening, Loading, and Saving 1 Supported File Formats for Import and Export . . . . . . . . . . . . . 1-2 Methods for Importing Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 Tools that Import Multiple File Formats . . . . . . . . . . . . . . . . . 1-7 Importing Specific File Formats . . . . . . . . . . . . . . . . . . . . . . . 1-7 Importing Data with Low-Level I/O . . . . . . . . . . . . . . . . . . . . . 1-8 Import Images, Audio, and Video Interactively . . . . . . . . . . . . . 1-9 Viewing the Contents of a File . . . . . . . . . . . . . . . . . . . . . . . . 1-9 Specifying Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10 Generating Reusable MATLAB Code . . . . . . . . . . . . . . . . . . . 1-11 Import or Export a Sequence of Files . . . . . . . . . . . . . . . . . . . 1-13 Save and Load Parts of Variables in MAT-Files . . . . . . . . . . . . 1-14 Save and Load Using the matfile Function . . . . . . . . . . . . . . 1-14 Load Parts of Variables Dynamically . . . . . . . . . . . . . . . . . . . 1-16 Avoid Inadvertently Loading Entire Variables . . . . . . . . . . . . 1-17 Partial Loading and Saving Requires Version 7.3 MAT-Files . . 1-17 MAT-File Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Overview of MAT-File Versions . . . . . . . . . . . . . . . . . . . . . . . 1-19 Save to Nondefault MAT-File Version . . . . . . . . . . . . . . . . . . 1-21 Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 Accelerate Save and Load Operations for Version 7.3 MAT- Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22 Growing Arrays Using matfile Function . . . . . . . . . . . . . . . . . . 1-23 Unexpected Results When Loading Variables Within a Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25 Create Temporary Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27 Text Files 2 Ways to Import Text Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Select Text File Data Using Import Tool . . . . . . . . . . . . . . . . . . 2-4 Select Data Interactively . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Import Data from Multiple Text Files . . . . . . . . . . . . . . . . . . . 2-7 Import Dates and Times from Text Files . . . . . . . . . . . . . . . . . . 2-9 Import Numeric Data from Text Files . . . . . . . . . . . . . . . . . . . 2-11 Import Comma-Separated Data . . . . . . . . . . . . . . . . . . . . . . . 2-11 Import Delimited Numeric Data . . . . . . . . . . . . . . . . . . . . . . 2-12 Import Mixed Data from Text Files . . . . . . . . . . . . . . . . . . . . . 2-14 Import Large Text File Data in Blocks . . . . . . . . . . . . . . . . . . . 2-18 Import Data from a Nonrectangular Text File . . . . . . . . . . . . . 2-25 Write to Delimited Data Files . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27 Export Numeric Array to ASCII File . . . . . . . . . . . . . . . . . . . 2-27 Export Table to Text File . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 Export Cell Array to Text File . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Write to a Diary File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 Spreadsheets 3 Ways to Import Spreadsheets . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Import Data Interactively or Programmatically . . . . . . . . . . . . 3-2 Paste Data from Clipboard . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Read Spreadsheet Data Using Import Tool . . . . . . . . . . . . . . . . 3-4 Select Data Interactively . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Import Data from Multiple Spreadsheets . . . . . . . . . . . . . . . . 3-6 Read Spreadsheet Data into Table . . . . . . . . . . . . . . . . . . . . . . 3-8 Read Spreadsheet Data into Arrays . . . . . . . . . . . . . . . . . . . . . 3-12 System Requirements and Supported File Formats for Spreadsheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 Read a Sequence of Spreadsheet Files . . . . . . . . . . . . . . . . . . 3-16 Get File Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16 Read One File At a Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17 Preview the Data from File . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17 Write Data to Excel Spreadsheets . . . . . . . . . . . . . . . . . . . . . . 3-19 Write Tabular Data to Spreadsheet File . . . . . . . . . . . . . . . . . 3-19 Write Numeric and Text Data to Spreadsheet File . . . . . . . . . 3-20 Disable Warning When Adding New Worksheet . . . . . . . . . . . 3-21 Format Cells in Excel Files . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21 Define Import Options for Tables . . . . . . . . . . . . . . . . . . . . . . . 3-22 Low-Level File I/O 4 Import Text Data Files with Low-Level I/O . . . . . . . . . . . . . . . . . 4-2 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 Reading Data in a Formatted Pattern . . . . . . . . . . . . . . . . . . . 4-3 Reading Data Line-by-Line . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 Testing for End of File (EOF) . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Opening Files with Different Character Encodings . . . . . . . . . 4-9 Import Binary Data with Low-Level I/O . . . . . . . . . . . . . . . . . . 4-10 Low-Level Functions for Importing Data . . . . . . . . . . . . . . . . 4-10 Reading Binary Data in a File . . . . . . . . . . . . . . . . . . . . . . . . 4-10 Reading Portions of a File . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 Reading Files Created on Other Systems . . . . . . . . . . . . . . . 4-15 Opening Files with Different Character Encodings . . . . . . . . 4-16 Export to Text Data Files with Low-Level I/O . . . . . . . . . . . . . 4-18 Write to Text Files Using fprintf . . . . . . . . . . . . . . . . . . . . . . 4-18 Append To or Overwrite Existing Text Files . . . . . . . . . . . . . . 4-20 Open Files with Different Character Encodings . . . . . . . . . . . 4-23 Export Binary Data with Low-Level I/O . . . . . . . . . . . . . . . . . . 4-24 Low-Level Functions for Exporting Data . . . . . . . . . . . . . . . . 4-24 Write Binary Data to a File . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24 Overwrite or Append to an Existing Binary File . . . . . . . . . . . 4-25 Create a File for Use on a Different System . . . . . . . . . . . . . 4-27 Open Files with Different Character Encodings . . . . . . . . . . . 4-28 Write and Read Complex Numbers . . . . . . . . . . . . . . . . . . . . 4-28 Images 5 Importing Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Getting Information About Image Files . . . . . . . . . . . . . . . . . . 5-2 Reading Image Data and Metadata from TIFF Files . . . . . . . . 5-3 Exporting to Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6 Exporting Image Data and Metadata to TIFF Files . . . . . . . . . 5-6 Scientific Data 6 Import CDF Files Using Low-Level Functions . . . . . . . . . . . . . . 6-2 Represent CDF Time Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5 Import CDF Files Using High-Level Functions . . . . . . . . . . . . . 6-6 Export to CDF Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10 Map NetCDF API Syntax to MATLAB Syntax . . . . . . . . . . . . . . 6-13 Import NetCDF Files and OPeNDAP Data . . . . . . . . . . . . . . . . 6-15 MATLAB NetCDF Capabilities . . . . . . . . . . . . . . . . . . . . . . . 6-15 Read from NetCDF File Using High-Level Functions . . . . . . . 6-15 Find All Unlimited Dimensions in NetCDF File . . . . . . . . . . . 6-18 Read from NetCDF File Using Low-Level Functions . . . . . . . 6-19 Resolve Errors Reading OPeNDAP Data . . . . . . . . . . . . . . . . . 6-23 Export to NetCDF Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24 MATLAB NetCDF Capabilities . . . . . . . . . . . . . . . . . . . . . . . 6-24 Create New NetCDF File From Existing File or Template . . . 6-24 Merge Two NetCDF Files . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26 Write Data to NetCDF File Using Low-Level Functions . . . . . 6-28 Importing Flexible Image Transport System (FITS) Files . . . 6-31 Importing HDF5 Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-33 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-33 Using the High-Level HDF5 Functions to Import Data . . . . . . 6-33 Using the Low-Level HDF5 Functions to Import Data . . . . . . 6-40 Exporting to HDF5 Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-41 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-41 Using the MATLAB High-Level HDF5 Functions to Export Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-41 Using the MATLAB Low-Level HDF5 Functions to Export Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-42 Working with Non-ASCII Characters in HDF5 Files . . . . . . . . 6-50 Create Dataset and Attribute Names Containing Non-ASCII Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-50 Create Variable-Length String Data Containing Non-ASCII Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-51 Import HDF4 Files Programatically . . . . . . . . . . . . . . . . . . . . . 6-54 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-54 Using the MATLAB HDF4 High-Level Functions . . . . . . . . . . 6-54 Map HDF4 to MATLAB Syntax . . . . . . . . . . . . . . . . . . . . . . . . . 6-58 Import HDF4 Files Using Low-Level Functions . . . . . . . . . . . . 6-60 Import HDF4 Files Interactively . . . . . . . . . . . . . . . . . . . . . . . . 6-63 Step 1: Opening an HDF4 File in the HDF Import Tool . . . . . 6-63 Step 2: Selecting a Data Set in an HDF File . . . . . . . . . . . . . 6-65 Step 3: Specifying a Subset of the Data (Optional) . . . . . . . . 6-66 Step 4: Importing Data and Metadata . . . . . . . . . . . . . . . . . . 6-66 Step 5: Closing HDF Files and the HDF Import Tool . . . . . . . 6-67 Using the HDF Import Tool Subsetting Options . . . . . . . . . . . 6-67 About HDF4 and HDF-EOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-80 Export to HDF4 Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-81 Write MATLAB Data to HDF4 File . . . . . . . . . . . . . . . . . . . . . 6-81 Manage HDF4 Identifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-83 Audio and Video 7 Read and Write Audio Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 Record and Play Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5 Record Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5 Play Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7 Record or Play Audio within a Function . . . . . . . . . . . . . . . . . 7-8 Get Information about Video Files . . . . . . . . . . . . . . . . . . . . . . 7-10 Read Video Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11 Read All Frames in Video File . . . . . . . . . . . . . . . . . . . . . . . . 7-11 Read All Frames Beginning at Specified Time . . . . . . . . . . . . 7-12 Read Video Frames Within Specified Time Interval . . . . . . . . 7-13 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14 Supported Video File Formats . . . . . . . . . . . . . . . . . . . . . . . . . 7-16 What Are Video Files? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16 Formats That VideoReader Supports . . . . . . . . . . . . . . . . . . . 7-16 View Codec Associated with Video File . . . . . . . . . . . . . . . . . 7-17 Troubleshooting: Errors Reading Video File . . . . . . . . . . . . . 7-18 Convert Between Image Sequences and Video . . . . . . . . . . . . 7-19 Export to Video . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-23 Characteristics of Audio Files . . . . . . . . . . . . . . . . . . . . . . . . . 7-25 XML Documents 8 Importing XML Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2 What Is an XML Document Object Model (DOM)? . . . . . . . . . . 8-2 Example — Finding Text in an XML File . . . . . . . . . . . . . . . . . 8-3 Exporting to XML Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6 Creating an XML File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6 Updating an Existing XML File . . . . . . . . . . . . . . . . . . . . . . . . 8-8 Memory-Mapping Data Files 9 Overview of Memory-Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2 What Is Memory-Mapping? . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2 Benefits of Memory-Mapping . . . . . . . . . . . . . . . . . . . . . . . . . 9-2 When to Use Memory-Mapping . . . . . . . . . . . . . . . . . . . . . . . . 9-4 Maximum Size of a Memory Map . . . . . . . . . . . . . . . . . . . . . . 9-5 Byte Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5 Map File to Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6 Create a Simple Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . 9-6 Specify Format of Your Mapped Data . . . . . . . . . . . . . . . . . . . 9-7 Map Multiple Data Types and Arrays . . . . . . . . . . . . . . . . . . . 9-8 Select File to Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10 Read from Mapped File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12 Write to Mapped File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-18 Write to Memory Mapped as Numeric Array . . . . . . . . . . . . . 9-18 Write to Memory Mapped as Scalar Structure . . . . . . . . . . . . 9-19 Write to Memory Mapped as Nonscalar Structure . . . . . . . . . 9-20 Syntaxes for Writing to Mapped File . . . . . . . . . . . . . . . . . . . 9-21 Work with Copies of Your Mapped Data . . . . . . . . . . . . . . . . 9-22 Delete Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-25 Ways to Delete a Memory Map . . . . . . . . . . . . . . . . . . . . . . . 9-25 The Effect of Shared Data Copies On Performance . . . . . . . . 9-25 Share Memory Between Applications . . . . . . . . . . . . . . . . . . . 9-26 Internet File Access 10 Proxy Server Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2 MATLAB and Web Services Security . . . . . . . . . . . . . . . . . . . . 10-3 MATLAB Does Not Verify Certificate Chains . . . . . . . . . . . . . 10-3 Download Data from Web Service . . . . . . . . . . . . . . . . . . . . . . 10-4 Convert Data from Web Service . . . . . . . . . . . . . . . . . . . . . . . . 10-7 Download Web Page and Files . . . . . . . . . . . . . . . . . . . . . . . . 10-10 Example — Use the webread Function . . . . . . . . . . . . . . . . 10-10 Example — Use the websave Function . . . . . . . . . . . . . . . . 10-11 Call Web Services from Functions . . . . . . . . . . . . . . . . . . . . . 10-12 Error Messages Concerning Web Service Options . . . . . . . . 10-13 Send Email . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14 Perform FTP File Operations . . . . . . . . . . . . . . . . . . . . . . . . . 10-16 Display Hyperlinks in the Command Window . . . . . . . . . . . . 10-19 Create Hyperlinks to Web Pages . . . . . . . . . . . . . . . . . . . . . 10-19 Transfer Files Using FTP . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19

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