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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。
; b7 ]* z- k% Q6 Fnetlogo自带的social science--traffic grid这一例子当中,# Z- d) r% d8 g( P7 n1 r" i& h1 e0 Y6 p) E
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction- D$ Q! h& M5 j: ^5 p
grid-y-inc ;; the amount of patches in between two roads in the y direction; a3 I& p3 p9 Z* W
acceleration ;; the constant that controls how much a car speeds up or slows down by if
3 o$ t2 |, j4 [! |7 E0 M! @. ] ;; it is to accelerate or decelerate
9 n# c6 L: o. A' J; T1 c* z phase ;; keeps track of the phase2 _' v: h J% |! m. I9 w8 W9 y
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure n2 H& u6 Z$ }3 [. U+ @
current-light ;; the currently selected light7 o7 [* B$ f2 C L
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;; patch agentsets/ X4 {, B) Y* n% q$ D8 l. o( B( [
intersections ;; agentset containing the patches that are intersections
( ?% U, }5 y( t roads ;; agentset containing the patches that are roads* Z' F" ?' f( v2 ?! Y c
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+ t$ X- m b0 G3 [3 \! C' {turtles-own
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/ |, y' G. N0 s2 d speed ;; the speed of the turtle" h2 Q) Z7 w5 w$ f4 z+ L' O; S
up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ \$ B( t9 Y4 n* }) w wait-time ;; the amount of time since the last time a turtle has moved$ c" B8 j0 G9 n9 G0 ?
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4 H! X( ^0 L8 @7 `3 Gpatches-own4 W6 [9 z7 K/ A
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1 f, u. e% q3 }. M' F intersection? ;; true if the patch is at the intersection of two roads4 P) _: e% n' b( \0 F
green-light-up? ;; true if the green light is above the intersection. otherwise, false.- h* {4 B3 w8 g5 P
;; false for a non-intersection patches.7 F* C3 k+ C% _- s
my-row ;; the row of the intersection counting from the upper left corner of the' K2 ]) _' j; K% e# Q' v3 l
;; world. -1 for non-intersection patches.
# `, c4 U8 B' o" a3 A( y7 U1 K( E my-column ;; the column of the intersection counting from the upper left corner of the
8 ^5 \5 X! m9 T, k ;; world. -1 for non-intersection patches. e, h* {/ j3 X; p
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
* M0 O0 j" m% v, B8 c auto? ;; whether or not this intersection will switch automatically.
. t& V7 s! x8 o7 ]7 l3 P ;; false for non-intersection patches.5 } a+ r' T% G5 Z& F
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;;;;;;;;;;;;;;;;;;;;;;
& V& W4 T% X+ Y& Q8 t2 j;; Setup Procedures ;;
6 N7 ~9 [9 f- x1 \: h/ P! K! T;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.% v" ]* ]/ k- q! F8 O/ A
;; Create num-cars of turtles if there are enough road patches for one turtle to4 v1 s2 {- X. ~, ]
;; be created per road patch. Set up the plots.
8 |6 t, L( e. Qto setup# a8 k; P- M3 h4 u4 O0 R6 B
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setup-globals
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6 {, j/ b1 l+ P ;; First we ask the patches to draw themselves and set up a few variables3 I2 p) V6 |4 J: |" E
setup-patches+ y% \, @$ l& X6 U. W* P
make-current one-of intersections
" F$ b- X. y# T( [1 e label-current
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set-default-shape turtles "car"$ _, u4 `9 E v: v: i5 \
8 Y, L& ^8 c9 Q5 N* f Z if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
7 Q, Y( i+ S; L2 |6 z1 F% R! Q9 S7 g "road. Either increase the amount of roads "
+ Z: ]5 X! J6 ^ Z "by increasing the GRID-SIZE-X or "( K5 g, V8 R: P/ ^7 R0 X; p
"GRID-SIZE-Y sliders, or decrease the "
0 m' ~/ {0 i+ g' w "number of cars by lowering the NUMBER slider.\n"
* Z0 w3 n4 i- \ "The setup has stopped.")1 R: \- C3 @3 ^+ x2 b+ \% m
stop
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- i( e1 [# b% N8 f5 Y2 o ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( e8 f# g0 t# C( `. i/ Q/ \, ^, Y
crt num-cars
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setup-cars2 E. c9 ~, V* V" k. d& E
set-car-color( ?9 r; V& z3 o, }
record-data/ E0 s: h5 e, ^4 W, {' d4 i8 I
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;; give the turtles an initial speed
! w' P& T- M8 L$ G. N6 O3 d ask turtles [ set-car-speed ]3 M: U( Z( r+ [+ C2 `+ U
4 q/ A q7 z% D+ p% A) z# o3 m9 Q K reset-ticks
$ _% H1 }% Q+ Dend
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;; Initialize the global variables to appropriate values, R/ o& `+ F; k* O
to setup-globals
s9 S+ m) O$ ]: b set current-light nobody ;; just for now, since there are no lights yet
7 M/ G9 @& {6 d2 d$ m' Z set phase 0
( ^) h( r7 ^) d: ` set num-cars-stopped 0
6 A* c b& \& n: \3 M3 `4 c set grid-x-inc world-width / grid-size-x
% [' D; }# g7 g. u set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 ?* u5 ?, `& k
set acceleration 0.099# I, p0 F; Y. A) O2 H0 b% ~+ I" {
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 q4 h3 j. ?7 i5 p" w
;; and initialize the traffic lights to one setting
( b. {/ U. Y3 u, `# S" G3 @/ o! Fto setup-patches
# k# D8 r9 E; q+ w1 y" A; J ;; initialize the patch-owned variables and color the patches to a base-color* V: B* @+ a# W3 o$ ^) j+ e
ask patches
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set intersection? false5 b) H% F X1 I/ r
set auto? false
$ r- g; s! q! o set green-light-up? true7 q2 C. R& ?$ [9 Z0 M! r
set my-row -1
9 i# [6 K; u% M7 Q* a4 U- ?8 B) _ set my-column -1 S; D: O2 N J h
set my-phase -1
8 V% F- {& ?* h( D6 }0 \8 X set pcolor brown + 3" j* v0 E, D9 `: C( ^7 C
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;; initialize the global variables that hold patch agentsets
2 X( b: r: S- K! N+ F set roads patches with0 Y( X9 x: f8 j# V6 b# v( u' U
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, l9 H9 ?" f& H9 G9 I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ J0 h* f; Q: c: I4 c
set intersections roads with' |) A0 \$ X. X1 R! B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and5 f7 z! J7 n3 `* Z1 |6 G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ I6 A) Z X- z+ e. C* F
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ask roads [ set pcolor white ]! i! h+ p9 L, ~6 l9 Z2 S
setup-intersections, @7 x# @, t4 u/ k3 l1 }4 n
end
3 R" a* r8 D7 A- Z6 y" s& @其中定义道路的句子,如下所示,是什么意思啊?. R1 v* m8 O0 r8 G( y
set roads patches with/ \# c) d% N# R% b% K+ c5 I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. f+ o) X, o: u/ z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! Q+ Z e& |1 a/ ^' j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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