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Exporting to Text Data Files

use the low-level

fprintf

function. For more information, see the following

sections:

• “Opening the File” on page 3-13

• “Describing the Output” on page 3-13

• “Appending or Overwriting Existing Files” on page 3-15

• “Opening Files with Different Character Encodings” on page 3-18

Note

fprintf

is based on its namesake in the ANSI Standard C Library.

However, MATLAB uses a vectorized version of

fprintf

that writes data from

an array with minimal control loops.

Opening the File

As with any of the low-level I/O functions, before exporting, open or create

afile with

fopen

,and obtain a file identifier. By default,

fopen

opens a file

for read-only access, so you must specify the permission to write or append,

such as

'w'

'a'

When you finish processing the file, close it with

fclose(fid)

Describing the Output

fprintf

accepts arrays as inputs, and converts the numbers or characters in

the arrays to text according to your specifications.

For example, to print floating-point numbers, specify

'%f'

.Other common

conversion specifiers include

'%d'

for integers or

'%s'

for strings. For a

complete list of conversion specifiers, see the

fprintf

reference page.

To move to a new line in the file, use

'\n'

Note Some Windows text editors, including Microsoft Notepad, require

anewline character sequence of

'\r\n'

instead of

'\n'

. However,

'\n'

sufficient for Microsoft Word or WordPad.

3-13

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Exporting Data

fprintf

reapplies the conversion information to cycle through all values

of the input arrays in column order.

For example, create a file named

exptable.txt

that contains a short table of

the exponential function, and a text header:

% create a matrix y, with two rows

x = 0:0.1:1;

y = [x; exp(x)];

% open a file for writing

fid = fopen('exptable.txt', 'w');

% print a title, followed by a blank line

fprintf(fid, 'Exponential Function\n\n');

% print values in column order

% two values appear on each row of the file

fprintf(fid, '%f

%f\n', y);

fclose(fid);

To view the file, use the

type

function:

type exptable.txt

This returns the contents of the file:

Exponential Function

0.000000

1.000000

0.100000

1.105171

0.200000

1.221403

0.300000

1.349859

0.400000

1.491825

0.500000

1.648721

0.600000

1.822119

0.700000

2.013753

0.800000

2.225541

0.900000

2.459603

1.000000

2.718282

3-14

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Exporting to Text Data Files

Additional Formatting Options. Optionally, include additional information

in the call to

fprintf

to describe field width, precision, or the order of the

output values. For example, specify the field width and number of digits to

the right of the decimal point in the exponential table:

fid = fopen('exptable_new.txt', 'w');

fprintf(fid, 'Exponential Function\n\n');

fprintf(fid, '%6.2f

%12.8f\n', y);

fclose(fid);

exptable_new.txt

contains the following:

Exponential Function

0.00

1.00000000

0.10

1.10517092

0.20

1.22140276

0.30

1.34985881

0.40

1.49182470

0.50

1.64872127

0.60

1.82211880

0.70

2.01375271

0.80

2.22554093

0.90

2.45960311

1.00

2.71828183

For more information, see “Formatting Strings” in the Programming

Fundamentals documentation, and the

fprintf

reference page.

Appending or Overwriting Existing Files

By default,

fopen

opens files with read access. To change the type of file

access, use the

permission

string in the call to

fopen

.Possible

permission

strings include:

•

for reading

•

for writing, discarding any existing contents of the file

•

for appending to the end of an existing file

3-15

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Exporting Data

To open a file for both reading and writing or appending, attach a plus sign

to the permission, such as

'w+'

'a+'

. For a complete list of permission

values, see the

fopen

reference page.

Note If you open a file for both reading and writing, you must call

fseek

frewind

between read and write operations.

Example — Append to an Existing Text File. Create a file

changing.txt

as follows:

myformat = '%5d %5d %5d %5d\n';

fid = fopen('changing.txt','w');

fprintf(fid, myformat, magic(4));

fclose(fid);

The current contents of

changing.txt

are:

Add the values

[55 55 55 55]

to the end of file:

% open the file with permission to append

fid = fopen('changing.txt','a');

% write values at end of file

fprintf(fid, myformat, [55 55 55 55]);

% close the file

fclose(fid);

To view the file, call the

type

function:

type changing.txt

This command returns the new contents of the file:

3-16

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Exporting to Text Data Files

Example — Overwrite an Existing Text File. This example shows two

ways to replace characters in a text file.

Atext file consists of a contiguous string of characters, including newline

characters. To replace a line of the file with a different number of characters,

you must rewrite the line that you want to change and all subsequent lines in

the file.

For example, replace the first line of

changing.txt

(created in the previous

example) with longer, descriptive text. Because the change applies to the first

line, rewrite the entire file:

replaceLine = 1;

numLines = 5;

newText = 'This file originally contained a magic square';

fid = fopen('changing.txt','r');

mydata = cell(1, numLines);

for k = 1:numLines

mydata{k} = fgetl(fid);

end

fclose(fid);

mydata{replaceLine} = newText;

fid = fopen('changing.txt','w');

fprintf(fid, '%s\n', mydata{:});

fclose(fid);

The file now contains:

This file originally contained a magic square

3-17

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Exporting Data

If you want to replace a portion of a text file with exactly the same number of

characters, you do not need to rewrite any other lines in the file. For example,

replace the third line of

changing.txt

with

[33 33 33 33]

replaceLine = 3;

myformat = '%5d %5d %5d %5d\n';

newData = [33 33 33 33];

% move the file position marker to the correct line

fid = fopen('changing.txt','r+');

for k=1:(replaceLine-1);

fgetl(fid);

end

% call fseek between read and write operations

fseek(fid, 0, 'cof');

fprintf(fid, myformat, newData);

fclose(fid);

The file now contains:

This file originally contained a magic square

Opening Files with Different Character Encodings

Encoding schemes support the characters required for particular alphabets,

such as those for Japanese or European languages. Common encoding

schemes include US-ASCII or UTF-8.

If you do not specify an encoding scheme,

fopen

opens files for processing

using the default encoding for your system. To determine the default, open a

file, and call

fopen

again with the syntax:

[filename, permission, machineformat, encoding] = fopen(fid);

3-18

Exporting to Text Data Files

If you specify an encoding scheme when you open a file, the following functions

apply that scheme:

fscanf

fprintf

fgetl

fgets

fread

,and

fwrite

For a complete list of supported encoding schemes, and the syntax for

specifying the encoding, see the

fopen

reference page.

3-19

Exporting Data

Exporting to XML Documents

To write data to an XML file, use the

xmlwrite

function.

xmlwrite

requires

that you describe the file in a Document Object Model (DOM) node. For an

introduction to DOM nodes, see “What Is an XML Document Object Model

(DOM)?” on page 2-37

For more information, see:

• “Creating an XML File” on page 3-20

• “Updating an Existing XML File” on page 3-22

Creating an XML File

Although each file is different, these are common steps for creating an XML

document:

Create a document node and define the root element by calling this method:

docNode =

com.mathworks.xml.XMLUtils.createDocument('root_element');

Get the node corresponding to the root element by calling

getDocumentElement

. The root element node is required for adding child

nodes.

Add element, text, comment, and attribute nodes by calling methods on the

document node. Useful methods include:

•

createElement

•

createTextNode

•

createComment

•

setAttribute

For a complete list of the methods and properties of

DOM nodes, see the

org.w3c.dom

package description at

http://download.oracle.com/javase/6/docs/api/

3-20

Exporting to XML Documents

As needed, define parent/child relationships by calling

appendChild

on the

parent node.

Tip Text nodes are always children of element nodes. To add a text node, call

createTextNode

on the document node, and then call

appendChild

on the

parent element node.

Example — Creating an XML File with xlmwrite

Suppose that you want to create an

info.xml

file for the Upslope Area

Toolbox (described in “Add Documentation to the Help Browser”), as follows:

<?xml version="1.0" encoding="utf-8"?>

<tocitem target="upslope_product_page.html">Upslope Area Toolbox

<tocitem target="demFlow_help.html">demFlow</tocitem>

<tocitem target="facetFlow_help.html">facetFlow</tocitem>

<tocitem target="flowMatrix_help.html">flowMatrix</tocitem>

<tocitem target="pixelFlow_help.html">pixelFlow</tocitem>

</tocitem>

</toc>

To create this file using

xmlwrite

,follow these steps:

Create the document node and root element,

toc

docNode = com.mathworks.xml.XMLUtils.createDocument('toc');

Identify the root element, and set the

version

attribute:

toc = docNode.getDocumentElement;

toc.setAttribute('version','2.0');

Add the

tocitem

element node for the product page. Each

tocitem

element in

this file has a

target

attribute and a child text node:

product = docNode.createElement('tocitem');

product.setAttribute('target','upslope_product_page.html');

product.appendChild(docNode.createTextNode('Upslope Area Toolbox'));

toc.appendChild(product)

3-21

Exporting Data

Add the comment:

product.appendChild(docNode.createComment(' Functions '));

Add a

tocitem

element node for each function, where the

target

is of the

form

function_help.html

functions = {'demFlow','facetFlow','flowMatrix','pixelFlow'};

for idx = 1:numel(functions)

curr_node = docNode.createElement('tocitem');

curr_file = [functions{idx} '_help.html'];

curr_node.setAttribute('target',curr_file);

% Child text is the function name.

curr_node.appendChild(docNode.createTextNode(functions{idx}));

product.appendChild(curr_node);

end

Export the DOM node to

info.xml

,and view the file with the

type

function:

xmlwrite('info.xml',docNode);

type('info.xml');

Updating an Existing XML File

To change data in an existing file, call

xmlread

to import the file into a DOM

node. Traverse the node and add or change data using methods defined by the

World Wide Web consortium, such as:

•

getElementsByTagName

•

getFirstChild

•

getNextSibling

•

getNodeName

•

getNodeType

When the DOM node contains all your changes, call

xmlwrite

to overwrite

the file.

3-22

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