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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。
9 y" T7 Q9 ^3 I4 _; c+ v2 Knetlogo自带的social science--traffic grid这一例子当中,9 z2 j% r# f, }1 r, c
globals, H! i4 k# ~/ w# l1 t, l
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grid-x-inc ;; the amount of patches in between two roads in the x direction2 S. F, a( Y, |0 q: d
grid-y-inc ;; the amount of patches in between two roads in the y direction* ?: ]% S* q; C6 t8 k% B% F+ \
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 a4 s. d6 x7 K& X: t ] ;; it is to accelerate or decelerate$ ` \' Q9 c$ p k- F r- }% z
phase ;; keeps track of the phase" l5 t; e |, F4 I4 c) z9 }
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure" S7 o5 W/ W- ?1 B- k: ]" E
current-light ;; the currently selected light" p8 s$ ?9 t$ Z5 e' R$ p
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;; patch agentsets
5 |: `2 q0 F5 N intersections ;; agentset containing the patches that are intersections5 o1 z2 V( P9 i$ A# s
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle9 o, P% l" S/ L# r& C! X; W
up-car? ;; true if the turtle moves downwards and false if it moves to the right% r% J& C2 d9 O" j" d4 v
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own& A; O) q# V; ^$ `. F
[
/ ]. j# X+ D. A7 y* p& w intersection? ;; true if the patch is at the intersection of two roads9 @# F( t* w1 D8 f# X; A
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ d" ]$ j0 [( A. j1 w ;; false for a non-intersection patches.
% N1 k2 X# A z8 m& G" c& x my-row ;; the row of the intersection counting from the upper left corner of the* m$ j8 f( \2 [
;; world. -1 for non-intersection patches.1 y. M- H8 v3 ?# o$ H; o
my-column ;; the column of the intersection counting from the upper left corner of the) u4 c. d2 O, B+ T5 p" c" Q
;; world. -1 for non-intersection patches.
# W0 v: P7 K3 |, d0 y6 O my-phase ;; the phase for the intersection. -1 for non-intersection patches.4 ?5 \* Z! t7 q1 ]9 v( `5 R
auto? ;; whether or not this intersection will switch automatically.
' n0 I: \9 O0 ]3 l6 F. Z* ^7 u ;; false for non-intersection patches.# v9 O; V2 J' F1 T. k! C! j$ f
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;;;;;;;;;;;;;;;;;;;;;;
8 G2 \3 X* G6 w( j/ S: V;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.! A- P/ p3 q* m' A
;; Create num-cars of turtles if there are enough road patches for one turtle to
! V x; k4 V! ^3 e7 d G;; be created per road patch. Set up the plots.# a! a; V4 {# Q3 [
to setup6 K8 W- U5 D+ _: S9 ]) m
ca
+ l0 }8 D. a2 P setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
6 U1 A& [, O9 `6 ~8 }( [ setup-patches
% ]8 ^3 q3 X8 O G( i4 R make-current one-of intersections# h' ^3 E$ T' n, M6 H. v
label-current1 Z$ z' ?9 _; K
: X9 f# ?# r) l% h5 a set-default-shape turtles "car"
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if (num-cars > count roads)
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$ \- \3 j) u- J6 R! W* \ user-message (word "There are too many cars for the amount of "
7 @: U) S! Y# E9 u/ u "road. Either increase the amount of roads "/ Y, e/ \! w8 J5 l+ P
"by increasing the GRID-SIZE-X or "
+ V# m) l7 W, Y$ w0 X6 s8 e "GRID-SIZE-Y sliders, or decrease the "% Q6 G. I& `5 ]: [
"number of cars by lowering the NUMBER slider.\n"/ b9 I+ K3 w5 o+ K. Z1 X
"The setup has stopped.")
; \, O$ I3 i1 X3 G% J% ~ stop
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; \/ ]/ K& b! d3 n" G A ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 {. P2 Q- o; J1 j6 c7 j4 e" j6 W
crt num-cars0 M6 u4 P5 F$ \5 m5 y: d
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setup-cars- w5 G( [ q- X1 Y' M5 P
set-car-color0 |# m, \) n- G# N' r7 c( R
record-data
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;; give the turtles an initial speed
4 c9 d7 q& h; A+ I, i- N& I4 }$ h ask turtles [ set-car-speed ]
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reset-ticks0 S& l/ ]/ F6 h. `
end
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;; Initialize the global variables to appropriate values
; q$ w) d2 l/ ^$ x- B0 Kto setup-globals
( N3 v% W8 Y8 i) @1 N9 [6 G0 l set current-light nobody ;; just for now, since there are no lights yet7 x9 w, K2 P# ]$ R- X4 N
set phase 06 v0 K9 P; e A }" j* L
set num-cars-stopped 0
3 N/ _( n2 `9 |3 Q set grid-x-inc world-width / grid-size-x% P7 J. G+ ^0 N# H! t6 j3 U
set grid-y-inc world-height / grid-size-y
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& S2 F: J& y7 r! {" h- }: s ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( X6 ?! {1 t8 X, R2 Q; @$ N set acceleration 0.099" o1 u: \( f/ T( I, A+ `0 x
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
5 ~ b6 T( s% T& m3 m: M" `- ~;; and initialize the traffic lights to one setting
& n% d' M, ~9 Q1 Wto setup-patches
- g- O* i3 r5 |+ M3 }' U. P4 L ;; initialize the patch-owned variables and color the patches to a base-color
( j- g( c) g# P( h0 w ask patches' r: ?8 @! D9 _( I. o- J; N( Z
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set intersection? false4 J% W% N) a! x5 e& @8 T9 `* y
set auto? false
% F" N8 x& y( Y N0 R# D s set green-light-up? true; k, l7 q5 p! a3 V5 w8 W" {% l
set my-row -1
6 }* M5 l$ G+ a H+ V5 j set my-column -1/ o$ u8 b+ \. L: L
set my-phase -1; b! q0 N/ F' }% }* c2 F' _8 ]/ m
set pcolor brown + 3; w2 }. k1 m( Q2 \4 y% g
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9 r( K! L+ ^4 ^, P& P, l2 }& @8 @- B3 } ;; initialize the global variables that hold patch agentsets9 ~1 @1 O2 ]0 ]: L6 l( r
set roads patches with
; }, ?$ a$ T$ O& I" W$ { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ }5 u+ @* W L* d$ L8 b# w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 E9 P! t3 h6 V0 o0 N set intersections roads with1 m" q1 F1 m$ r2 A# ], p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: Y6 Y% k! D! d# P (floor((pycor + max-pycor) mod grid-y-inc) = 0)] _: U5 t5 D* d3 s% S( r( E, k9 c8 N
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ask roads [ set pcolor white ]
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' m2 `, H6 l6 U% U其中定义道路的句子,如下所示,是什么意思啊?7 t/ A) |- B$ G
set roads patches with7 L8 w+ x5 E; X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( ?% {% z' J6 W (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 s9 @2 J; S7 s" ?% e: ^/ F5 @8 C
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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