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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。" U" E' V1 b. c0 f
netlogo自带的social science--traffic grid这一例子当中,9 w; j* ^9 H/ l4 u% m
globals6 }; A6 d: T, C4 z: ~5 F* Z7 v1 `
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grid-x-inc ;; the amount of patches in between two roads in the x direction
! @" v/ w' _5 {+ L grid-y-inc ;; the amount of patches in between two roads in the y direction
$ r$ Q$ c. u2 m; R! z) c0 z acceleration ;; the constant that controls how much a car speeds up or slows down by if, }3 `3 R% k4 }# e- p- i1 l- u
;; it is to accelerate or decelerate
[+ F) {3 U+ M" L' b phase ;; keeps track of the phase
2 E6 r6 |1 j2 k4 D: Y2 Z num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
; z; s& c$ _7 g current-light ;; the currently selected light
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( [0 P R% v8 N5 N9 N ;; patch agentsets, y$ A; ^6 {, `# ~6 |
intersections ;; agentset containing the patches that are intersections
2 d) p' p( s/ y( M; l$ r roads ;; agentset containing the patches that are roads5 m8 @9 ]* p& d
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) w( L. g3 w; l4 ]) P/ e( I5 k, Sturtles-own7 v3 ~1 ]; J# T2 R* Q+ z6 Y
[
1 b3 h7 ~2 h4 n! J& z speed ;; the speed of the turtle
w# O, P% U$ l, c7 m up-car? ;; true if the turtle moves downwards and false if it moves to the right
8 U: U- ]2 Y& [ wait-time ;; the amount of time since the last time a turtle has moved
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! E0 Q- U' R4 `% r9 v2 L) o9 V+ npatches-own
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2 ?& {. @9 [! G4 e0 }2 p intersection? ;; true if the patch is at the intersection of two roads: p5 C7 \, P+ l8 v. q: F, g) |
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
: a; u I. a; d& n# d ;; false for a non-intersection patches.$ p3 L6 y4 m6 c- \- w3 \1 a# N
my-row ;; the row of the intersection counting from the upper left corner of the
3 @- j# }$ \. @1 o: ^% Y+ g8 T: J ;; world. -1 for non-intersection patches.
$ f, P& A" w q$ b5 }# F5 Q3 l) P* t my-column ;; the column of the intersection counting from the upper left corner of the
/ l* y$ L# T# d! t- a# t. n ;; world. -1 for non-intersection patches.
% R+ h+ w0 F+ T7 P: j. D3 f my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 D- U( s- |! z( X1 `' h. c: o auto? ;; whether or not this intersection will switch automatically. T( u& `: }0 D) r, c) D
;; false for non-intersection patches.- A) g/ S( ?* h/ F# J$ {1 ~. i. [
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;;;;;;;;;;;;;;;;;;;;;;# D5 X( Y2 C2 j) ] W3 ]# J
;; Setup Procedures ;;! N( z8 i$ w7 D& U; h! Z
;;;;;;;;;;;;;;;;;;;;;;
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2 Z6 [( _, T ?+ P" [# i6 i2 j;; Initialize the display by giving the global and patch variables initial values.0 F: V5 q7 m3 x, y
;; Create num-cars of turtles if there are enough road patches for one turtle to# ?) \4 }5 S3 C, w8 S
;; be created per road patch. Set up the plots." ^8 w% k- p! [* _
to setup. z* N. c3 @ }8 |# r5 p
ca
5 z9 n" f7 D2 ~) K1 f setup-globals+ M1 @" a9 |9 e( _& F% D* E1 `
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;; First we ask the patches to draw themselves and set up a few variables/ `5 T$ j$ c" b% z( v& r
setup-patches
, y9 i7 M8 a7 r8 n0 L+ n make-current one-of intersections2 l/ ?" H; g- F$ l; m- L
label-current% { ?5 \. l3 X# X9 Q$ x: _8 K* @
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set-default-shape turtles "car"6 w0 }5 j% T. l8 W( S
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if (num-cars > count roads)& s2 n( N4 S6 H+ J
[
5 q( e1 G0 K2 r$ F6 R, Y user-message (word "There are too many cars for the amount of "2 _& A9 p; J+ K- r% E
"road. Either increase the amount of roads "
! d( H! m* F- \" B! ~$ W "by increasing the GRID-SIZE-X or "% H G( w. d* J- n9 }
"GRID-SIZE-Y sliders, or decrease the "
/ J+ S# R; @. Y "number of cars by lowering the NUMBER slider.\n"
: j# ]0 R. e( D. q "The setup has stopped.")( J7 x) w# X1 o5 U$ W' g- P
stop
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! h+ ?+ {" V; V3 v ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 i9 @! E9 L- i2 {* A6 Z, m crt num-cars; [! D, s3 I7 b# K# e% l
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setup-cars
" X. z, Y( c9 ]0 J3 s set-car-color" R( J9 c5 Z) z C8 ~' [6 L
record-data2 c8 l2 o/ t/ `- O) v3 n) N. d
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;; give the turtles an initial speed
# g6 _* d* S3 S' x# F. z1 ?3 g+ Y ask turtles [ set-car-speed ]
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6 ^# }; O8 O# Z8 L" \1 I6 K$ D, H reset-ticks
6 T" }/ f, U5 I! r. pend
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1 S# P ?) s/ g2 Y9 q) s3 Z;; Initialize the global variables to appropriate values
" B9 s7 u2 w L+ k7 eto setup-globals, p$ l8 i+ c- z; H! B( Z
set current-light nobody ;; just for now, since there are no lights yet) g7 s/ }0 c( u# Q9 X) x* @
set phase 07 S* o/ k3 {" C
set num-cars-stopped 0
$ c6 t* p) n! j" j' z9 Y4 q9 _ set grid-x-inc world-width / grid-size-x
) A0 G/ x- T/ T+ t( E 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 boundary
5 k+ M% V1 _8 f" U, m6 w- }7 O set acceleration 0.0994 D( F1 l' u* l: W
end# F7 M) n5 ^; B9 \
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! v0 s& v# F v3 f/ L) V
;; and initialize the traffic lights to one setting
6 {* ^* @' ^: s- a$ tto setup-patches0 V& q% I! z" r: k+ Q4 s
;; initialize the patch-owned variables and color the patches to a base-color8 n0 G3 C% D+ ?' R* H0 t9 O
ask patches/ A. I7 Z$ O8 a# L7 ~8 r" u
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set intersection? false
, ^% z2 p! d+ l+ ^0 p set auto? false
7 Q5 M: a# e$ E set green-light-up? true/ s2 B% l* b" z
set my-row -1) O+ i: N8 |5 S1 u+ q
set my-column -1; y: L8 D* V! v5 a4 r/ [
set my-phase -1
& K" r0 G( g, M9 i, f7 e set pcolor brown + 37 @( U7 c( @/ f1 B
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; w5 {$ p3 g) \9 o ;; initialize the global variables that hold patch agentsets
; r3 ^- u7 L- e set roads patches with
- q# f/ p3 F. N/ j+ d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 b' F6 ? ?, G" t" P. r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! }1 P9 Q* ^0 J, n5 g
set intersections roads with
! w. T7 i2 V4 T5 J' ] [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
% Q' b5 z, L3 _8 d2 P2 R. O Q3 ^/ H$ R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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9 p; J j' {* X9 A+ |2 i) Y# W' b8 D4 h ask roads [ set pcolor white ]; {6 R; Q- }- Z) [: _, W! J
setup-intersections! |/ P* n, e; W5 n: g0 F
end* K! d+ x& m) y) Z
其中定义道路的句子,如下所示,是什么意思啊?
; [! `& x, K' Q- p: r u5 c set roads patches with5 q4 ?- W; p& m) {% Y0 Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 }7 _% T" l: h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. n' Z- }' ~6 x4 b* `
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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