CDS 101: Principles of Feedback and Control Lecture 10.1: Uncertainty Analysis 2 December 2002

Lecture

This final lecture provides a desription of how control can be used for designing feedback systems that provide robustness to uncertainty. This ties together the various concepts discussed in the class and illustrates the main ideas of the ducted fan example. A summary of the main topics of the course is also given.

• Lecture Presentation

Mud card responses [advanced search]:

#!/usr/bin/perl # -*- perl -*- # # htdbsearch.cgi - search for matching files in a database directory # RMM, 16 Mar 97 # # This CGI script searches the description files in a directory for a # against a set of criteria # # This script should be called as # # http://machine/path/htdblist.cgi? # or # http://machine/path/htdblist.cgi?db=&args # # where is the name of the configuration file that defines # all of the information needed to generate the listing. The optional # arguments are: # # _count=NN only list the first NN entries # _tight=1 use tight listing # _ssi=1 don't print header, trailer info (for includs) # # Include the necessary libraries require "cgi-lib.pl"; require "htdblib.pl"; # Parse script arguments if (&htdbinit) { # If the form contains some values, use them to search, and return # the results. if ($in{'_dbconfig'}) { # Generate the context header for the browser print &PrintHeader; # Print out the introductory information for search if (defined &SearchHeader) {&{$SearchHeader}($DBName);} # Summarize the search that was performed $rsltheader = defined &ResultHeader ? \&ResultHeader : htdb::ResultHeader; &{$rsltheader}(%in) if (!$in{_ssi}); # Go through and look for matching files if (not &PrintMatches) { &PrintNoMatches if (!in{ssi}); } # Generate the trailer if (defined &dbtrailer) {$dbtrailer = \&DBTrailer}; if (not $dbtrailer) {$dbtrailer = \&htdb::DBTrailer;} &{$dbtrailer}($DBName) if (!in{ssi}); } else { # Check to see if there is a user function for printing the search form if (defined &SearchForm) {$searchform = \&SearchForm}; if (not $searchform) {$searchform = \&htdb::SearchForm;} # Print out the introductory information for search if (defined &SearchHeader) {&{$SearchHeader}($DBName);} # Print the search form &{$searchform}(%in); } } # # Subroutine for printing the matches that occured # sub PrintMatches { my ($num_found); # Go to the database directory and read the contents chdir $DBPath || die "Can't cd to $DBPath"; opendir(DIR, '.') || die "Can't open $DBPath"; @filenames = readdir(DIR); closedir(DIR); # Check to see if there is a user function for checking matches if (defined &CheckEntry) {$checkentry = \&CheckEntry}; if (not $checkentry) {$checkentry = \&htdb::CheckEntry;} # Check to see if there is a user function for parsing filenames if (defined &ParseFname) {$parsefname = \&ParseFname}; if (not $parsefname) {$parsefname = \&htdb::ParseFname;} # Check to see if there is a user function for printing the entry if (defined &PrintEntry) {$printentry = \&PrintEntry}; if (not $printentry) {$printentry = \&htdb::PrintEntry;} # Check to see if there is a user function for printing the entry if (defined &TightEntry) {$tightentry = \&TightEntry}; if (not $tightentry) {$tightentry = \&htdb::TightEntry;} # Open the list environment used for the results # Print the command to generate a list of elements print ($in{_tight} ? "

\n" : "

\n"); # Loop through the filenames in order. $getfnames = defined &GetFnames ? \&GetFnames : htdb::GetFnames; @filenames = &{$getfnames}($DBPath); for (@filenames) { # Parse the filname and extract the ID and tag information ($id, $tag) = &{$parsefname}($filename = $_); next if not $id; # Open the file and extract the contents $contents = &htdb::readfile($filename); next if not $contents; # Now see if this entry matches the criteria for a match next if not &{$checkentry}($contents, %in); # Print out the information associated with this entry $count += &{($in{_tight} ? $tightentry : $printentry)} ($filename, $contents, $id, $tag, $DBURL."/".$filename); $num_found++; # See if we are counting and stop if needed last if ($in{_count} && $count > $in{_count}); } # Close the list environment used for the results print ($in{_tight} ? "

No matches found

\n"; print $footer; }

Reading Material and Handouts

Handouts from lecture

• Lecture handout

Required reading

• None
  

Supplemental reading

• None
  

Homework

There is no homework set this week. The final exam will be handed out on Wednesday.