MATLAB Programming

4 M-File Programming
Improving Performance
The MATLAB Profiler generates a report that shows how your program
spends its processing time. For details about using the MATLAB Profiler,
see Profiling for Improving Performance in the MATLAB Desktop Tools and
Development Environment documentation. For tips on other ways to improve
the performance of your programs, see Chapter 11, “Improving Performance
and Memory Usage”.
Three types of reports are available:
• “Summary Report” on page 4-6
• “Detail Report” on page 4-6
• “File Listing” on page 4-6
Summary Report
The summary report provides performance information on your main program
and on every function it calls. This includes how many times each function is
called, the total time spent in that function, along with a bar graph showing
therelativetimespentbyeachfunction.
Detail Report
When you click a function name in the summary report, MATLAB displays a
detailed report on that function. This report shows the lines of that function
that take up the most time, the time spent executing that line, the percentage
of total time for that function that is spent on that line, and a bar graph
showing the relative time spent on the line.
File Listing
The detail report for a function also displaystheentireM-filecodeforthat
function. This listing enables you to view the time-consuming code in the
context of the entire function body. For every line of code that takes any
significant time, additional performance information is provided by the
statistics and by the color and degree of highlighting of the program code.
4-6