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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。
; ~& v( m6 o) J" B& Wnetlogo自带的social science--traffic grid这一例子当中,9 G6 |5 Y+ W# u5 n$ D
globals' f9 ]/ }9 F9 M2 Y2 V
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( t7 r6 ~8 x3 K$ s) } grid-x-inc ;; the amount of patches in between two roads in the x direction! s& {9 H" z n: b" N! t
grid-y-inc ;; the amount of patches in between two roads in the y direction
0 N0 U- s0 T$ k6 `4 s! \ acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 L" N- @" B' D, |" J, `8 H7 J1 ` ;; it is to accelerate or decelerate+ M. `, m7 i0 K3 D/ X4 `
phase ;; keeps track of the phase
# H5 K7 S8 |. F) d1 G num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
6 r7 O6 e' x$ U; ]! [, v* V* E current-light ;; the currently selected light. q3 I, B6 p& w4 {- P0 k
- O- j3 o7 |( ?, q ;; patch agentsets1 D) M& Q' |6 |4 y% N
intersections ;; agentset containing the patches that are intersections
( w$ f: Z+ ^ {" o" b% v3 O roads ;; agentset containing the patches that are roads4 J/ M5 z; I# ^5 l7 w9 N P
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6 c# ^4 Z) [' S) oturtles-own! `* A8 B; I& Z5 m# ]
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_1 p7 h5 I% Q8 d speed ;; the speed of the turtle# t- S3 ^& s! [! J1 i& M
up-car? ;; true if the turtle moves downwards and false if it moves to the right0 D+ J; |% K9 ^: p
wait-time ;; the amount of time since the last time a turtle has moved) V1 _) {3 a& g( D9 U( g
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4 T9 j; H- s* Ipatches-own# d7 j4 W. V+ Z/ m- |$ x
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0 y6 H( \/ C+ x" K: q5 b, } intersection? ;; true if the patch is at the intersection of two roads
7 q9 j v8 P0 a2 s$ H green-light-up? ;; true if the green light is above the intersection. otherwise, false.
9 \& C0 J: d5 A) j5 n3 q. p ;; false for a non-intersection patches.9 E) p4 Z1 M; }" q( t
my-row ;; the row of the intersection counting from the upper left corner of the3 S. ? X j1 I' o* d$ c) T
;; world. -1 for non-intersection patches.# ~. Y$ r: Z9 L4 P
my-column ;; the column of the intersection counting from the upper left corner of the
0 h o; |& `, f' O; F8 Y ;; world. -1 for non-intersection patches./ d8 o* C3 W( M% O
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 B# V- q3 X5 ?% J+ L0 {1 t! y5 B auto? ;; whether or not this intersection will switch automatically.
# k4 A' Q! i9 z I4 o ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
* a7 s, J1 Z/ ~# G, C0 E;; Setup Procedures ;;8 A7 T6 R% Z1 K& M) P
;;;;;;;;;;;;;;;;;;;;;;9 V: o' n' r: e, m
! K. b+ ^% X% {3 r+ s;; Initialize the display by giving the global and patch variables initial values.. o( x( P, L {+ s2 O w
;; Create num-cars of turtles if there are enough road patches for one turtle to* X/ h, u8 j" d/ q5 d
;; be created per road patch. Set up the plots.1 [' E- \6 ]7 ?
to setup X+ c* L- W9 d8 g& Q. n* D
ca
: p9 P; w1 C& {* D7 A setup-globals
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( G+ n5 j' S, g4 w" Q ;; First we ask the patches to draw themselves and set up a few variables' K, l- c: u8 _5 y; s [( l0 V+ V
setup-patches. b& U7 o: r6 f
make-current one-of intersections8 j" u4 E3 B6 }0 h( l' A7 e
label-current
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3 M% ^# X, s f# e* z! T 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 "
# H6 ?$ x* ]. p) V# h. I. y "road. Either increase the amount of roads "
; j5 \) e2 k% H" e) t Q "by increasing the GRID-SIZE-X or "7 C! h$ X: g' b" ^& k9 k p0 [
"GRID-SIZE-Y sliders, or decrease the "
. t$ V* P, ]7 A- W, M% ?/ K5 P% Z2 E: m "number of cars by lowering the NUMBER slider.\n"
2 C/ \. B1 K( C4 q/ ^9 T0 b0 m "The setup has stopped.")) p, [6 c0 h. G9 P: C; t3 s0 ]$ Q' \7 s
stop; S" y! [- N- O0 z+ F; i' I
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* c S$ Z+ y5 ^7 T5 T) ~" Q
crt num-cars
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setup-cars
3 u4 o$ p/ d9 ~3 l/ z! P' h set-car-color
( W9 A, }$ V& c3 W2 g2 x2 v) R record-data
" a" T3 L9 n* B1 B+ b/ g ]
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: M( C7 ~! `; a- F+ s ;; give the turtles an initial speed
# L' y) x. b0 Y ask turtles [ set-car-speed ]' ^ _6 }# b/ o( ~3 q+ X. f* y
7 s3 o% O' `9 b7 _& | reset-ticks" n: h; M" d7 l+ ?
end
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;; Initialize the global variables to appropriate values
9 t& k K- w4 B; C: ito setup-globals
$ e0 S/ f0 ~) w4 t set current-light nobody ;; just for now, since there are no lights yet# n. w- ^: k1 z2 C
set phase 0# |6 a* H4 M$ N8 h0 y3 `
set num-cars-stopped 0
( \, w. I, I2 v3 D/ Y4 { set grid-x-inc world-width / grid-size-x! r5 u# x! h# S1 v8 W
set grid-y-inc world-height / grid-size-y4 {; t: K- p* z( N( M+ \) C
; k2 s+ T/ R) j% g) a ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 h: q" \8 N0 x# v7 I" o( e3 [2 x
set acceleration 0.099
" ~4 b6 A8 y- W6 }. }8 _end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 B. C8 F- L! E9 ^% o' s
;; and initialize the traffic lights to one setting
; l8 M2 I$ D% ]+ j' r' X' s. Kto setup-patches4 k2 P' E' t0 ?- S* m/ R
;; initialize the patch-owned variables and color the patches to a base-color
# ~1 A- w2 ~9 I+ |1 }. R ask patches6 @, C, t$ N; e. i2 o5 K
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set intersection? false, f6 |7 B' h! e+ `" @( K
set auto? false
! }' F0 e# [. w: o' t4 d, @+ |0 e set green-light-up? true
1 o3 _& ]3 r7 h5 h& E3 z0 ?, ] set my-row -15 d! |7 f Z3 N, G* C0 ]' T0 k
set my-column -1# I; K% b% [% T' H1 L
set my-phase -1
5 j% f4 U! k1 E9 i& @% @ Z set pcolor brown + 30 k/ Y$ \! ^% B& D
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;; initialize the global variables that hold patch agentsets" t* m/ |% @5 L# r: z
set roads patches with
5 u' p/ S; J: ^9 J% a. t [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- |8 y, r6 f- [2 T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" D* e: O2 a) {3 f) T# I
set intersections roads with; J+ x3 E4 A! V: @; @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& }! I2 T2 }* i) R1 ?, X3 Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 [$ Y6 C% `7 k5 D1 S
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ask roads [ set pcolor white ]
7 {6 H- X/ c! ~! |0 x0 a setup-intersections% b. j( e" k3 J3 ~8 B$ |
end
( Q# M* U" W+ _$ M其中定义道路的句子,如下所示,是什么意思啊?: P5 ]$ S0 R' _- ~& U4 F
set roads patches with4 S8 ^6 G$ g6 k* U7 o
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) E# t. }' N" e+ i& p (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 C/ K* Q# }. v
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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