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新手,在看netlogo自带的例子时,有几行程序看不懂,希望高手能够指点。
; y$ i1 f6 t2 L7 m0 lnetlogo自带的social science--traffic grid这一例子当中,
- o5 ^" F. W( X, m- b, i/ e* O3 Fglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction/ i, O1 ~- R0 @; i8 r; ~+ Q
grid-y-inc ;; the amount of patches in between two roads in the y direction2 l& L; A% L# x; g0 t7 e
acceleration ;; the constant that controls how much a car speeds up or slows down by if
& P% U4 P1 D' C; D0 w* [ ;; it is to accelerate or decelerate
$ G' Y9 n. x; V: l phase ;; keeps track of the phase
. X. @' @# G0 ?4 L" j8 e num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure) Q+ L3 j- r: \- U9 T5 ?* }+ |
current-light ;; the currently selected light! O" F( x! U2 B- e/ d3 A
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;; patch agentsets
& k; K, B* d, L5 j intersections ;; agentset containing the patches that are intersections: `' C% j0 H" ?4 `% d) Z. ]4 n
roads ;; agentset containing the patches that are roads
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3 r [$ s( S4 `0 Wturtles-own4 Y8 `$ ^4 B, a& L+ F
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speed ;; the speed of the turtle# o5 F4 G- m+ U
up-car? ;; true if the turtle moves downwards and false if it moves to the right
" {9 i4 ?! B" V+ h; \/ P. n wait-time ;; the amount of time since the last time a turtle has moved4 V! B- R) r1 U
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patches-own6 {% y0 C' R4 s$ E' S) L, N' d
[
0 w) J7 h8 [$ [$ @2 O7 `# F intersection? ;; true if the patch is at the intersection of two roads
) p. Y7 ~, j3 w0 u green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' l8 v( j& x2 O; X ;; false for a non-intersection patches.0 Y% b& s \! g5 s6 C$ i! |
my-row ;; the row of the intersection counting from the upper left corner of the
0 C9 X% X6 f9 z; t0 O9 D7 _ ;; world. -1 for non-intersection patches.% R6 C! o1 @7 Z, r8 V
my-column ;; the column of the intersection counting from the upper left corner of the! P7 M3 m! U/ H' J9 N! z) m
;; world. -1 for non-intersection patches.0 \3 D9 m& ^; `8 O3 J
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
B1 N. }; _* ` Z auto? ;; whether or not this intersection will switch automatically.) s7 v2 h2 p# t1 y% V7 w# N
;; false for non-intersection patches.
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& q; \! t x( w' o$ T;;;;;;;;;;;;;;;;;;;;;;
; _; T1 O# q+ v0 Z6 s7 [4 d f. |: A7 U;; Setup Procedures ;;5 o/ R8 A) Y/ X6 n* F9 z, E+ i
;;;;;;;;;;;;;;;;;;;;;;. Q# l/ x" l6 A+ u6 l$ Z! R
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;; Initialize the display by giving the global and patch variables initial values.
) k6 t7 d$ @* o0 p F. t- ~;; Create num-cars of turtles if there are enough road patches for one turtle to
- r1 |& L1 I7 t4 u/ o% y4 K;; be created per road patch. Set up the plots.
1 ~' q+ {1 R: P. K0 W( p% a0 |to setup
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setup-globals
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0 c7 y- q! R: \) k& @ ;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections
' y5 ^5 T$ X7 e6 |/ I label-current
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# q& q% y, m/ V8 f/ f set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
7 ~! B) j: B8 l& h" k b& V "road. Either increase the amount of roads "
) t/ {. m- I+ L9 I; p "by increasing the GRID-SIZE-X or ") I3 J- L7 s8 @+ W. u+ G5 N
"GRID-SIZE-Y sliders, or decrease the "
& i0 V$ I" e1 Q- F5 p "number of cars by lowering the NUMBER slider.\n"
4 X5 r' \8 b% S' ^3 }7 b "The setup has stopped.")
" B, `5 N: X( ?& B. V stop
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: l' Y6 G3 H% ]2 J9 ?* y; b ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" V- y( w4 s' h
crt num-cars
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setup-cars/ a' }) s- j# a# t5 c! E
set-car-color/ K8 U/ {$ G5 P0 x3 b5 Y+ o
record-data
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;; give the turtles an initial speed+ [& K# f+ w$ n1 p$ R
ask turtles [ set-car-speed ]% V" ~5 H& D9 e6 h6 Z6 |
2 s3 ? Z% W$ ^$ j: ~ reset-ticks
; I, ^/ g7 [8 \, @/ g6 _: B" e6 mend
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. l; ?# z0 [4 j6 R' J;; Initialize the global variables to appropriate values/ B- e- R) i: N$ f
to setup-globals6 o6 q- I9 S; W. R7 x$ B! J
set current-light nobody ;; just for now, since there are no lights yet
8 }# l8 Z$ c" p8 J7 i) Q set phase 0
5 \$ r; `6 H& U7 J set num-cars-stopped 0/ @- u; ~2 q( Q. ~* ~) r& m" A4 i, _: E
set grid-x-inc world-width / grid-size-x
1 L2 f4 J2 ~! W2 w6 Q. |, }. Q set grid-y-inc world-height / grid-size-y" d$ y, d5 q4 `; g" p3 n% |* O0 u) `- z& A
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& `5 w( L5 a$ q" r
set acceleration 0.099
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" x( m* g# k6 ^2 M;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% T" O* g. Y7 d! _
;; and initialize the traffic lights to one setting7 g: n [6 U4 y4 ~7 u0 o, U* _- D0 i
to setup-patches; c7 k j' G1 c* y9 }8 S3 [& M
;; initialize the patch-owned variables and color the patches to a base-color
, q- z8 z9 s" {- ]8 j ask patches- |3 P/ q* A& x0 S% }) Z, z% E
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0 W4 n: p, [$ G7 b, @ set intersection? false N0 w; g$ _* A- f8 h+ Y
set auto? false
" Y/ v" E- e$ _! D set green-light-up? true3 ]; N/ v* N0 p# B n+ O) [& q" O
set my-row -1
. O5 S' r3 y. e4 U2 p* M set my-column -1
) O9 V5 ~2 N9 Y* k. l3 S% e set my-phase -1
/ j9 n# L2 p% E1 {# _; R W set pcolor brown + 36 [6 m# q, b1 B- @
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;; initialize the global variables that hold patch agentsets
+ B p/ x9 x/ @& | set roads patches with
2 ?% N/ V4 N; J& R [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ |4 e/ Q7 ~! a! a$ [& P! |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; ?$ Y% ^' [1 d. Q
set intersections roads with
- T! I$ [9 P( w) |/ l/ W, j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& `. u6 e: E9 D' b# W8 { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 Q1 A' i$ l/ ]; H8 L4 ^" {* z
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ask roads [ set pcolor white ]
3 A. U- Z& g, E. M; m setup-intersections% `! a" J) ^1 B" C: P
end
8 [( Y9 w0 a6 Y& c4 B7 P/ S其中定义道路的句子,如下所示,是什么意思啊?
8 t' s1 G" m2 P' g9 p set roads patches with0 ~- G1 Q; C( ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 C: T& z, w6 Y0 X (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& z- v6 D a# I# l; t) P谁能帮我解释一下[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0)是什么意思吗? |
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