| MATLAB Release Notes | |
Programming and Data Types Features
Partial Evaluation of Expressions
Within the context of an if or while expression, MATLAB does not necessarily evaluate all parts of a logical expression. In some cases, it is possible, and often advantageous, to determine whether an expression is true or false through only partial evaluation. This is sometimes referred to as short-circuiting.
For example, if A equals zero in statement 1 below, then the expression evaluates to false, regardless of the value of B. In this case, there is no need to evaluate B and MATLAB does not do so. In statement 2, if A is nonzero, then the expression is true, regardless of B. Again, MATLAB does not evaluate the latter part of the expression.
You can use this property to your advantage to cause MATLAB to evaluate a part of an expression only if a preceding part evaluates to the desired state.
Note
Partial evaluation of expressions in if and while was also available in MATLAB 6.0, but was not documented.
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New MATLAB Search String Function
strfind is a new character array function in MATLAB. It searches for all occurrences of a string pattern within another, longer string. Placement of the two string arguments in the argument list requires that you be specific about which string is the character pattern to search for and which is the string in which to search. This allows you more control over how the search is performed compared with the MATLAB findstr function, particularly when executing searches within a loop.
New File I/O Functions for Scientific Data Formats
There are six new MATLAB 6.1 functions that enable you to retrieve information and data from Common Data Format (CDF), Flexible Image Transport System (FITS), and Hierarchical Data Format (HDF) files.
| Function |
Purpose |
cdfinfo |
Return information about a CDF file |
cdfread |
Read data from a CDF file |
fitsinfo |
Return information about a FITS file |
fitsread |
Read data from a CDF file |
hdfinfo |
Return information about an HDF or HDF-EOS file |
hdfread |
Read data from an HDF or HDF-EOS file |
New Audio Functions
MATLAB 6.1 includes two new audio functions for 32-bit Windows platforms only.
| Function |
Purpose |
audioplayer |
Create an audio object to play audio data |
audiorecorder |
Create an audio object to record audio data |
Date Conversion Changes
The datenum and datestr functions can now accept a date vector, as defined by datevec, as an input argument. For example, datestr(clock) returns the current date and time as string such as 27-Apr-2001 15:58:41.
| | Mathematics Features | Graphics Features | |