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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" Y; \7 d l2 C; {, Inetlogo自带的social science--traffic grid这一例子当中,# }5 ?. Z' z9 a
globals }* d" C7 J5 ~# i. A
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1 s- ~1 i5 b6 Y3 t3 ^7 v grid-x-inc ;; the amount of patches in between two roads in the x direction, X0 X' J4 L0 L! W
grid-y-inc ;; the amount of patches in between two roads in the y direction3 N8 t* n8 ?9 S; D; t0 v
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 K/ m- M) F# \+ d8 ^ ;; it is to accelerate or decelerate& g0 k- `2 b6 B( z7 u# g, \
phase ;; keeps track of the phase( A4 _5 W" \: ]9 i7 E
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. e5 j' `; d) X0 X r/ X( D8 ~/ D
current-light ;; the currently selected light
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;; patch agentsets
2 q' n; m( } A6 t9 J" v/ h7 f* B& a intersections ;; agentset containing the patches that are intersections' L: v3 p5 K3 f ~, Y
roads ;; agentset containing the patches that are roads Q4 T5 [* M* A
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! S1 n3 M, |0 `+ P& G* Z; [turtles-own% `3 y" Q v% u" ^/ ~0 ^: {/ q
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speed ;; the speed of the turtle4 S+ @4 u& N! E2 x' W4 n5 j' D( z
up-car? ;; true if the turtle moves downwards and false if it moves to the right1 Q5 {; @/ t) ~4 w/ Y7 C# r
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own- m8 ~( x7 s9 G1 J3 z' Q
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intersection? ;; true if the patch is at the intersection of two roads8 Y0 D% H- n6 g c
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
" x) R2 E' V" ?, o9 | ;; false for a non-intersection patches.* d- U0 d5 x5 ?# o& R/ {- z4 |
my-row ;; the row of the intersection counting from the upper left corner of the
4 m1 {! i; Q4 X0 Q" `# e ;; world. -1 for non-intersection patches.- c( _# b1 A" ^8 F+ F" G
my-column ;; the column of the intersection counting from the upper left corner of the. y- {3 ^* T# S: ]2 d1 r" _
;; world. -1 for non-intersection patches., S6 M$ O8 c H; D! ~+ P4 l
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
% g8 X+ y+ d: i% g) q: p auto? ;; whether or not this intersection will switch automatically.. R0 z% P8 Z6 E8 F8 O. o ]8 Y
;; false for non-intersection patches.
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3 e. C# b9 p6 s+ ~8 w* m;;;;;;;;;;;;;;;;;;;;;;$ y8 l s' ~8 ?& j
;; Setup Procedures ;;
8 T5 F& z; X0 x: e3 w;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.2 a! X$ w5 }1 e* ?/ G& {- F
;; Create num-cars of turtles if there are enough road patches for one turtle to/ b" r/ X/ E+ U" R- f6 o; G
;; be created per road patch. Set up the plots.
L4 P! m5 ^5 Q: Qto setup& a! v0 h9 M' ]0 i- g: P
ca
! v& s0 Z; o) c, ? ?% I+ G7 c setup-globals
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1 \9 W3 r' O. F. D$ d& i ;; First we ask the patches to draw themselves and set up a few variables
4 m' w- q8 h a K+ e9 r; X# q setup-patches9 w6 h% J1 @" W3 q; J
make-current one-of intersections
: E1 y8 Z8 N) v( T% j& a9 ?, g label-current w9 w8 L) F; ], v- S4 C
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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 "
" c& w+ m, O0 G6 l; z "road. Either increase the amount of roads "
C5 t4 E& J! k "by increasing the GRID-SIZE-X or "; `' ]7 z8 P5 ]4 e
"GRID-SIZE-Y sliders, or decrease the "
% J, [$ Z" H! l8 h5 H p "number of cars by lowering the NUMBER slider.\n"% S: B+ ]/ G* Z; {5 o L* R
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- D2 t0 y2 [' y7 }' g1 w, f7 j
crt num-cars
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" ]$ e# W L% J- r" f# r setup-cars
& q: j. |& t1 o7 |8 A; v! R set-car-color
" _% o! V5 x0 C' G2 b* B7 H record-data E. D% e* G2 u
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8 Z w. Z8 Y* d ;; give the turtles an initial speed
7 ]* d- \! b/ @7 }" g/ ^+ ^ ask turtles [ set-car-speed ]
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7 T# B) h; D6 Q) W$ J# r2 e& Q7 D- Z reset-ticks7 p0 o. f$ \& L
end
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( |& P' F: z+ G5 h4 C8 z* b0 Y;; Initialize the global variables to appropriate values
8 L% Q6 X. f+ g! e |$ k9 c; dto setup-globals
) J1 H4 {" I+ U+ J n" }: t set current-light nobody ;; just for now, since there are no lights yet
1 s0 ^! Q6 I* `: D# B0 v+ ` set phase 0
* K6 c( x$ U9 \5 E set num-cars-stopped 0% a$ ~4 } k) C% i" Q: @' z
set grid-x-inc world-width / grid-size-x
3 k7 B. G/ `, J ^2 B) \ set grid-y-inc world-height / grid-size-y. Y5 _4 Q- ]6 Z- m
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
* z+ f. ~3 z( M9 t+ l set acceleration 0.099: B! g- g: f$ H9 @0 P
end g8 G! d1 f$ S& q7 H
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets," ~6 o, @6 A! W) ?4 _$ G, q. Y
;; and initialize the traffic lights to one setting
& S! h( `6 B8 V: rto setup-patches9 s5 [4 ~1 F' Z4 ~) p9 p5 j7 X
;; initialize the patch-owned variables and color the patches to a base-color
+ c6 Q: L, m' H) b1 Z/ q ask patches8 B) N" b/ ?: \
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set intersection? false
5 h, b2 ?1 `' f+ k" l! U set auto? false
9 ~! N$ _6 i; C3 k* v( S I set green-light-up? true
+ P5 ?( \2 U' I) W% c: w set my-row -1( H3 g/ J+ [3 [1 Q
set my-column -1
* m# E0 e% v `. p1 s- O9 i set my-phase -1
. s- l+ Y$ @; l# `: R set pcolor brown + 39 t8 N! T. }- l& \0 F; ~
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;; initialize the global variables that hold patch agentsets: H+ o9 o. M8 h- R$ `3 z
set roads patches with2 z! x8 ^5 H! X( ]7 b( s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ v8 _6 v- p; t5 P, }4 K (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' k' G% p9 Z$ r& q2 D9 k3 q
set intersections roads with
+ K" c, E& G |: s* N7 I3 T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* m: D3 [! o: n5 c1 D( Y, g1 X' [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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) ^- _, M6 _' P; T7 j- Y ask roads [ set pcolor white ]
+ @$ C2 J" X/ O5 a* ` setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?+ s6 m: H" K j. q% J& D
set roads patches with$ |" G9 U9 }+ |) g5 [ P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 t& A$ ^ e c# P: a# T# {
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ k0 d- h: l; Q* o. X
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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