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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。
! L7 p0 K. l+ n* anetlogo自带的social science--traffic grid这一例子当中,8 X+ L2 G+ Q! R( X# @/ N) X
globals" m; g2 E C7 y8 p' X6 k9 q
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grid-x-inc ;; the amount of patches in between two roads in the x direction" N- w N8 W$ c# U; o
grid-y-inc ;; the amount of patches in between two roads in the y direction
' @' m# `, R4 A0 K acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 s! A Q) _& [: A1 L! h* S ;; it is to accelerate or decelerate/ y, f9 P, R2 n, u% @
phase ;; keeps track of the phase6 O" ?/ b+ H0 f, a. I/ N& g
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
, C D: t& m. }' { current-light ;; the currently selected light
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# R2 o- K" r0 S6 F# ^ ;; patch agentsets
% B- h0 T# I/ p' R3 G intersections ;; agentset containing the patches that are intersections7 N$ p/ X- w. h8 v( i
roads ;; agentset containing the patches that are roads
7 y6 \- _9 S/ S/ H5 W]( ^+ _ f+ U: o( `: X- `6 S
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turtles-own
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. j6 C# @8 L' k) E) N) ` speed ;; the speed of the turtle7 j0 s! d4 s- ]6 ? {, J
up-car? ;; true if the turtle moves downwards and false if it moves to the right
; A1 W( N3 u; {% S1 M: N5 h/ d, R wait-time ;; the amount of time since the last time a turtle has moved
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6 X" v" }+ D# d6 ]; |patches-own! z1 i/ G+ P; b2 S' G
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; i X4 j+ \2 r intersection? ;; true if the patch is at the intersection of two roads
6 }8 z6 z. a }% K8 \5 F green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ j: [4 X W! N6 r- { ;; false for a non-intersection patches.3 e6 L4 v- \2 u
my-row ;; the row of the intersection counting from the upper left corner of the8 q; s5 z. p$ c& Q/ n
;; world. -1 for non-intersection patches. l/ P& a* ]: Z$ \* C8 ^
my-column ;; the column of the intersection counting from the upper left corner of the
: W/ f! E k( ]! l1 w3 b+ n. f: b ;; world. -1 for non-intersection patches.8 f, }& Q6 X" J5 C8 Z
my-phase ;; the phase for the intersection. -1 for non-intersection patches.( }" c% j: @( z z
auto? ;; whether or not this intersection will switch automatically.
8 ]5 B' v( A' w% k( p$ j' Z: r { ;; false for non-intersection patches.9 q0 s1 h2 E7 H. j3 G+ O/ D1 z
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. b! F2 B* x6 \' }& k5 F( f. P! y;;;;;;;;;;;;;;;;;;;;;;
" {! z E' l2 v;; Setup Procedures ;;( F5 _- [& m x T. H, y+ C
;;;;;;;;;;;;;;;;;;;;;;' D" f. |6 G% V
) }! ]- O4 f) k;; Initialize the display by giving the global and patch variables initial values.
" p& t! [4 k; U;; Create num-cars of turtles if there are enough road patches for one turtle to
) z6 b! Y0 }! F6 y/ q0 a;; be created per road patch. Set up the plots.
3 }# D9 `6 v. f0 r3 j$ A$ y& L8 G, Z! tto setup4 E, q5 a- v5 q6 h |$ u \$ I
ca
4 ?1 M1 B8 a# }7 H7 u setup-globals
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. r* d% I6 O+ [6 {: N ;; First we ask the patches to draw themselves and set up a few variables$ T" w J- k8 z* C
setup-patches% _+ E& S7 q! i Z! k. x3 |
make-current one-of intersections$ }0 k2 {5 z* G2 f) x6 m! o9 Y; e
label-current
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set-default-shape turtles "car"; Z5 `7 a7 G0 I+ g+ |7 l2 B: c j
( j4 n: Y" r+ r2 a. q9 [% ? if (num-cars > count roads)# V: M, s6 ~9 l" P: R' Y/ j) @% d
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: R4 e& w9 o. m- }) { user-message (word "There are too many cars for the amount of "; D, r/ z7 D) d) s
"road. Either increase the amount of roads "0 C9 G) c1 P4 [. ^( U
"by increasing the GRID-SIZE-X or "; |2 H" G/ s3 ?: L6 O/ I
"GRID-SIZE-Y sliders, or decrease the "
, k# p% ]1 G4 j- D9 j, i "number of cars by lowering the NUMBER slider.\n"# F# | s& U7 r
"The setup has stopped.")% [! X2 c H( d# K9 S
stop
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1 I8 J( V+ b( n1 E ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 {8 ?2 g% d3 V0 {
crt num-cars
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9 m; Z' E6 X1 E. l setup-cars
, q' a: `6 z" v& _ set-car-color
* Y. A K6 e) M& F record-data
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7 ]& C) P7 [3 o4 X; } ;; give the turtles an initial speed
$ P6 P8 @" b! `* m* V- [# j' i ask turtles [ set-car-speed ]0 x% {+ \4 e) W
U3 O1 w+ O& }. p1 b reset-ticks% \# K$ {# }3 m5 w5 }
end
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;; Initialize the global variables to appropriate values1 H( K" {' b0 i8 u6 h# V5 j/ D& I8 S& R
to setup-globals
C# g- R7 o* n7 a set current-light nobody ;; just for now, since there are no lights yet
6 Z5 Y, g; s5 [! r Y# {" p set phase 0
9 K9 d3 f+ D' C7 f) W) V set num-cars-stopped 0' G6 B4 H2 r ^; O8 _! J
set grid-x-inc world-width / grid-size-x
6 p g! E5 A1 P! s, C, C set grid-y-inc world-height / grid-size-y
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3 i7 d h$ }: k& V! b2 @ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 m8 R$ _$ T) l5 ~( ~! z8 ^* S4 p$ ~ set acceleration 0.0998 I3 `5 u: V" T {( W1 H; }% D
end8 ]7 ? G g" e4 [( I( b; i; E) l
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 f$ d5 {: w f3 S4 d4 B1 \# _4 W# D
;; and initialize the traffic lights to one setting: |, m2 q; w% |7 n1 v7 J8 W; D f
to setup-patches. E, N/ m4 W1 l1 M) Y0 E
;; initialize the patch-owned variables and color the patches to a base-color8 [" A$ V/ f) @4 C8 d7 O; j
ask patches3 `# B& S2 _. V: G$ t5 B
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set intersection? false! j( q) I/ y7 u) o& _- d6 |& }
set auto? false" j6 P9 u' Z9 g" C8 l1 S
set green-light-up? true0 g8 [' F! n5 O
set my-row -1: z5 z) I: K8 t' H+ T$ P
set my-column -1
6 ]8 D: C Z% W ^$ } set my-phase -15 K! l5 |7 o L
set pcolor brown + 32 O& k" {( u2 Y9 n8 e# h
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" s9 ^9 f# i9 v% {4 d ;; initialize the global variables that hold patch agentsets
# \' J, c$ R4 o2 m; C# s set roads patches with7 l4 W% Q7 r; ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or s, I( ?5 O% O; a) }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% \0 y. f- A |, q+ Y7 a set intersections roads with
# q! K+ N" Y4 ]2 W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! g6 k) i( x: S5 Y5 L' C- b9 s1 v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]( t; H0 J1 ?0 Q! C. b% L) r
setup-intersections6 x- e. b0 l s2 S6 I
end
9 p: O6 g& A% A7 v9 H! x+ H其中定义道路的句子,如下所示,是什么意思啊?
5 w# ^0 o0 e9 R+ a" E* R0 \ set roads patches with
- E T0 M3 g# y; [ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ m3 }0 v& A a- E6 z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 ?/ O9 |/ A. }* t
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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