Quick reference guide to LINEAR 
----- --------- ----- -- ------ 

Installation

To install the programs on your hard disk: make a directory
"linear" and download the file "linear.zip" to it.  Extract   
all files using WinZip (in the lab, WinZip will come up automatically 
if you click on "linear.zip").

You may edit the file linear.cfg with any text editor (e.g. Notepad
in Windows) to change the configuration options.  

To use LINEAR under Windows 95, 98, 2000, ME etc:
Under Start, choose Settings, Taskbar, Start Menu Programs, Add.
In the Command Line box, type "c:\linear\lin.bat" (changing the drive
letter if necessary).  Then click Next.  Select a folder to put
the shortcut in (typically you might use Programs), then click 
Next.  Type a name for the shortcut (e.g. Linear) and click Next.
Select the Linear icon.  

The "Edit" command may not work on some systems.  However, you
can always edit your file outside of Linear, using Notepad
or some other editor.  If using Word, make sure you save it as
"Text Only".  Note that Word annoyingly insists on adding the 
extension ".txt" to the file name.

Keyboard usage
  
     To make a choice in a menu, either press the key for the capital letter, 
       or move the reverse-video bar with the cursor control keys and press 
       Enter. 

     To exit to the main menu, press Esc.

     For on-line help, press F1.

     When asked for input from the keyboard, editing can be done as follows:
       Home         moves to beginning of input area
       Up arrow     recalls the last line you entered
       Left arrow   moves left
       Right arrow  moves right
       End          moves to end of input area
       Del          deletes character at cursor
       Ins          toggles between insert (thick cursor) and overwrite (thin 
                    cursor)     
       Backspace    deletes character left of cursor
       Enter        enters your response

     Default responses shown in square brackets are used if you press Enter
       alone.

     In horizontal menus, you can scroll through past screen contents (up to 
       127 lines).  Up and down arrow keys scroll one line, PgUp and PgDown 
       one page, Home and End move to start and end of buffer.

     Ctrl-Break interrupts screen output and returns to main menu. 

File selection

     Default extensions are used ('.PRB', '.TRP', '.DIF', '.TAB', '.RES' 
       depending on file type) if no extension is specified.  For file with 
       no extension, follow name with a period.  

     Wild cards ? and * in file names bring up a menu of matching files to 
       choose from.


LINEAR Commands 

  Files
  ....Load
          Loads a problem, DIF or TAB file into memory.  Problem file may be 
          entered from the keyboard.
  ....Record
          Starts or ends recording of results to a file or device.
  ....Save
          Saves the current tableau as a DIF or TAB file.
  ....Path
          Shows and sets current drive and directory.
  Solve
          Solves the problem, starting with the current tableau.
  Values
  ....Variables
          Shows current values of objective and all basic variables.
  ....Shadow Prices
          Shows current values of shadow prices (reduced costs, dual 
          variables) corresponding to all nonbasic variables.
  ....Ranging
          Objective ranging for each decision variable, or RHS ranging for 
          each constraint.
  ....Accuracy
          Checks how closely current solution satisfies original problem.
  Analyze
  ....Objective
          Parametric analysis of objective contribution for a variable.
  ....As parameter
          Parametric analysis, with a variable treated as adjustable 
          parameter.
  ....Rhs
          Parametric analysis of constant term of a constraint.
  Change
  ....Entry
          Displays and changes an entry of the tableau.
  ....Objective
          Interchanges a row of the tableau with the objective row.
  ....Add 
          Adds a new decision variable, new constraint or perturbation.
  ....Delete 
          Deletes a variable, constraint or perturbation
  ....Cut plane
          For all-integer problems, produces a cutting plane by method of 
          integer forms.
  Tableau
  ....Show tableau
          Displays some or all of the current tableau.
  ....Do pivot
          Performs a pivot operation, entering and leaving variables 
          specified by the user. 
  ....Get candidates
          Shows possible candidates for next pivot in solving problem or 
          obtaining alternative optima.
  Options
      Displays and changes various settings.
  Quit
      Exits to DOS.