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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。
( _; B) ~8 U7 G/ c7 h" Qnetlogo自带的social science--traffic grid这一例子当中,
1 v6 C% W1 U; R9 N$ wglobals* `$ p; N+ \( o/ h- d& i
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grid-x-inc ;; the amount of patches in between two roads in the x direction
2 ]" }6 d) A Q! a grid-y-inc ;; the amount of patches in between two roads in the y direction
- N+ p- |% m+ ^( { acceleration ;; the constant that controls how much a car speeds up or slows down by if ]- w5 |: J$ T% m! L+ `
;; it is to accelerate or decelerate- V, |+ G9 x# r+ l
phase ;; keeps track of the phase3 u Y) `4 `1 D
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
! f9 ^+ o7 @- k/ S6 E current-light ;; the currently selected light) T9 ?* F$ i; z" b& M7 S
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;; patch agentsets
1 I) u% a8 _% s$ g0 w7 \+ C/ @ intersections ;; agentset containing the patches that are intersections. T7 J& V6 b0 k' |
roads ;; agentset containing the patches that are roads* p% N0 R0 F; \0 I2 }( A3 j
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# V! i$ X/ N. H4 e/ qturtles-own
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speed ;; the speed of the turtle
" b3 Z8 c4 o/ W$ |+ G$ b up-car? ;; true if the turtle moves downwards and false if it moves to the right) U8 J8 k' r: J1 Y/ _
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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) @4 j5 K1 ~( p% m9 Q3 a5 ^ intersection? ;; true if the patch is at the intersection of two roads, O- R9 L5 C* o: h
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
; N# T& ~& d& P- ?. { ;; false for a non-intersection patches.- u. u4 o/ X0 e! u# Y2 f
my-row ;; the row of the intersection counting from the upper left corner of the
1 g, W2 m+ l# L1 T8 J% z% p% M ;; world. -1 for non-intersection patches.
! I1 B& Q: ]& g8 {; ^ my-column ;; the column of the intersection counting from the upper left corner of the
" x4 H j1 V9 Y4 s9 j( e ;; world. -1 for non-intersection patches.4 [3 O8 Z9 w! Z) ~
my-phase ;; the phase for the intersection. -1 for non-intersection patches.6 @+ o4 Z4 }8 n# X% a
auto? ;; whether or not this intersection will switch automatically.) d' T, L2 }1 }5 X& d9 B
;; false for non-intersection patches.- l5 q: [: v- y/ U" Q$ R7 _
]
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% l) H5 w, J0 V2 }9 G3 w( A;;;;;;;;;;;;;;;;;;;;;;( [; R3 p$ G1 |$ J1 Z- f
;; Setup Procedures ;;2 i9 J% }# A# _% w$ q
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
* _% E" n0 j4 b0 b;; Create num-cars of turtles if there are enough road patches for one turtle to {4 p; f: |# W
;; be created per road patch. Set up the plots.
1 }) A' b) G" e% eto setup0 T" k- |# G, K7 ]
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setup-globals
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: d7 I2 ]$ V) y! o" [5 h ;; First we ask the patches to draw themselves and set up a few variables; x+ z* f0 B: G+ @
setup-patches
, N2 n) `( V: A1 Y make-current one-of intersections
# D6 j* m( o( K* S label-current( S) _# ^0 _6 t# ]) \9 G+ a
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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 "
* S5 h4 V2 g8 \9 X4 G/ u9 E) ? "road. Either increase the amount of roads "
) y$ x) X6 o4 v0 U "by increasing the GRID-SIZE-X or "
; Q2 [! T$ E2 z \7 d3 D# l "GRID-SIZE-Y sliders, or decrease the "$ W" v: x/ @3 o' e2 S
"number of cars by lowering the NUMBER slider.\n"
- {3 T/ A! C- Y! m& J8 P* U4 r* e# q "The setup has stopped.")& c4 Q( C% P; M, i+ H% g
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, t, F" i- W2 {6 L1 A0 Q9 M crt num-cars: Z, [: d$ Y" B+ Q8 X. J1 f, k
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3 p! l8 k1 m2 P setup-cars
3 z( ^, X( ?% n) b set-car-color
% `" l' [) {, e" q5 K' v record-data
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: [6 e+ X5 I; w; M" k' D$ o) B ;; give the turtles an initial speed
+ b8 M: C1 F# @3 Y L ask turtles [ set-car-speed ]
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reset-ticks
* d3 b& V% {3 \3 pend
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;; Initialize the global variables to appropriate values7 j, ~. y! i) h1 i2 R
to setup-globals w% W/ G f: Y3 V& X
set current-light nobody ;; just for now, since there are no lights yet5 ]; g( K* u% x/ p/ M
set phase 0
9 o* H& U9 G4 e3 ] set num-cars-stopped 08 j; I1 \* z: p4 c7 o
set grid-x-inc world-width / grid-size-x. p$ o: K5 i Z
set grid-y-inc world-height / grid-size-y3 @" g4 B6 T5 b% \/ z9 X# 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
9 N R2 T- k D4 g+ r: e$ U- ]5 k set acceleration 0.099
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" m& E5 {5 i2 z/ ]- Q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. i/ I2 T; v, z$ Y1 y;; and initialize the traffic lights to one setting- u/ | A3 n; e4 ]! S
to setup-patches5 R1 V( d& J3 t! U6 J3 C
;; initialize the patch-owned variables and color the patches to a base-color9 H" _' x/ R% X5 [0 b
ask patches3 L A& J* z' C* S7 V% s/ E* }
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set intersection? false4 x! y6 e/ I( y! q5 Q' J
set auto? false$ K- p# F! u7 b% @
set green-light-up? true* |: R8 l) c$ p# ]. Q
set my-row -1/ u& B, q5 o3 n; j2 N
set my-column -1
7 U0 |+ C2 F" h, X( } set my-phase -1
/ e( {9 }) `7 Z7 j; B- w7 N. x set pcolor brown + 3
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5 f8 ?2 z7 X' a+ A ;; initialize the global variables that hold patch agentsets
. Z+ N" U8 C! ^: I5 c0 c set roads patches with
, I/ q/ f4 W2 L4 J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' }- t$ L4 C% J# r7 U% ^8 ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 @" T/ O3 ?% `! H, V; G. B
set intersections roads with+ Z- n9 ]- k B* Z9 Q1 z6 E0 P7 ?& p% T
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: ^+ b) W* I2 u. ]: j2 o( E9 e+ j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]. d2 Z" x) S) _; B. v* T
setup-intersections5 W( S+ M; h+ M2 Q9 ?8 i
end
, y- S4 j% x: A* n1 C0 O- |2 W) {2 z) m其中定义道路的句子,如下所示,是什么意思啊?# ? t& y9 n" j5 l& [
set roads patches with& h7 X, E7 ^, K1 Y7 R, h! @4 F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or u4 N' k6 D: B7 J: L
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! ]+ Z) w6 P$ K5 o6 k: x; \' a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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