Running a Computational Model

Accessing Program Output

• Textual output
  • Example from fireflies+

    0
    Flashing: 0/8
     0: PA=58, PD=101
     1: PA=68, PD=101
     2: PA=8, PD=140
     3: PA=78, PD=98
     4: PA=14, PD=95
     5: PA=49, PD=114
     6: PA=89, PD=51
     7: PA=7, PD=149
     
    10
    Flashing: 1/8
     0: PA=69, PD=100
     1: PA=80, PD=100
     2: PA=14, PD=141
     3: PA=90, PD=97
     4: PA=23, PD=96
     5: PA=58, PD=114
     6: PA=8, PD=51
     7: PA=13, PD=150
    

• Graphics
  • fireflies+ example 1: position in window represents physical location of firefly

    

  • fireflies+ example 2: same as Ex. 1, but in addition, clock "hands" show period and phase angle of fireflies

    

  • fireflies example 3: position in window represents phase angle and period of firefly (red fireflies are those with periods greater than 200; lighter blue represents more than one firefly on the same square)

    

  Varying Parameters and Initial Conditions

  • In StarLogo, moving sliders

  Changing the Program

  • In StarLogo, editing the "Procedures" file
  • A simple example of a StarLogo program (fire)

    patches-own [fire count]
    
    to setup
    ca 
    setfire 0
    if xcor > -49 [if (random 100) < density [setpc green]]
    if xcor = -49 [setpc red setfire 1]
    if xcor = -50 or
       ycor = -50 or
       ycor = 49 
         [setpc blue]
    end
    
    to go
    nsum4 fire count
    if pc = green 
       [if count > 0 
           [setfire 1 setpc red]]
    if (pc > red - 4) and (pc < red + 1)
       [setpc pc - 0.3]
    end
    
    to startup
    ca
    end
    

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  URL: http://www.indiana.edu/~gasser/programs1.html
  Last updated: 3 October 1995
  Comments: gasser@salsa.indiana.edu
  Copyright 1995, The Trustees of Indiana University

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