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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。
- Y$ c( ?. p |9 B) [( h3 g! Gnetlogo自带的social science--traffic grid这一例子当中,. Z3 _/ m: ~7 J# d9 ]
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grid-x-inc ;; the amount of patches in between two roads in the x direction" Z+ U% c7 h- X W6 G1 M2 x& G9 @
grid-y-inc ;; the amount of patches in between two roads in the y direction- Q1 X! i( L( B: c( C Z2 ?- U- t4 _
acceleration ;; the constant that controls how much a car speeds up or slows down by if3 I. P6 r7 P) b" K: k' ^
;; it is to accelerate or decelerate" D0 x5 y0 Z( V4 ~8 Z
phase ;; keeps track of the phase+ j: a% u. f2 b) S5 t8 M% V
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 K5 |9 Y- t. f4 D, ] current-light ;; the currently selected light
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7 }! Q( k/ D! F' u; W ;; patch agentsets6 E1 c/ h ]! H0 O% C5 i/ ?: U
intersections ;; agentset containing the patches that are intersections8 X; F$ X2 }1 H( e/ p# r
roads ;; agentset containing the patches that are roads
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turtles-own; T2 \: e; W8 C* @) a
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" Z1 }$ V, d3 Z7 e& f( }) z speed ;; the speed of the turtle
+ p3 S _0 a0 n+ i' O5 O up-car? ;; true if the turtle moves downwards and false if it moves to the right
! r" E1 S) {: F4 g D, M( E wait-time ;; the amount of time since the last time a turtle has moved
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% ~7 k) c1 P5 B3 |: Y& f7 r, l& G# q* jpatches-own
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9 G# e+ D7 d8 a7 D intersection? ;; true if the patch is at the intersection of two roads5 `" Y# W9 J8 b) C+ ?
green-light-up? ;; true if the green light is above the intersection. otherwise, false.- i* E7 I6 y4 \/ z/ a
;; false for a non-intersection patches.' H e: V- B" i8 R& j- V
my-row ;; the row of the intersection counting from the upper left corner of the
0 l' f/ M: E7 Q7 b) \ ;; world. -1 for non-intersection patches.
, j D/ E( [6 b my-column ;; the column of the intersection counting from the upper left corner of the
9 F+ N; A/ U7 s ;; world. -1 for non-intersection patches.
, ~' [* L" [' f e# ]) v0 s, a my-phase ;; the phase for the intersection. -1 for non-intersection patches.
, B2 L. O7 U7 A# V auto? ;; whether or not this intersection will switch automatically.' M+ M: `0 [4 X& J: H
;; false for non-intersection patches.
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6 ^9 ]- l5 k1 j. U) V;;;;;;;;;;;;;;;;;;;;;;) Y ~) D; R+ l! `
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
. L* E3 `; l+ o- h;; Create num-cars of turtles if there are enough road patches for one turtle to
" W/ A; Y8 H/ i% r& E;; be created per road patch. Set up the plots. f* V" o' _+ ?$ E7 E6 f# w: n
to setup
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3 N- o% c5 m+ n setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
% L( ]7 m: V* F5 q% r setup-patches# {# ]& |5 s9 e) q9 r$ x! m
make-current one-of intersections- a4 ~; k8 f4 V; Q
label-current# E9 B \. z: D. h
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set-default-shape turtles "car"
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$ V$ D+ n$ X( e2 X if (num-cars > count roads)# X& d: [" x: h
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user-message (word "There are too many cars for the amount of " X, @- k" U5 L9 G
"road. Either increase the amount of roads "3 e4 E9 ?7 E2 u3 S, M/ O: Q5 }' `: H
"by increasing the GRID-SIZE-X or "! y! @2 H" J, D& f; ^+ G8 M! c+ x
"GRID-SIZE-Y sliders, or decrease the "( }# z, Q; g, q" T1 }
"number of cars by lowering the NUMBER slider.\n"( q3 _3 J3 _! h. \' }
"The setup has stopped.")7 d9 C+ M8 K% Z7 a' @- H2 ~. J
stop
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6 M5 k/ W* E$ P7 c4 x ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ E: H2 j; m2 P% f9 {% E+ e
crt num-cars
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) q* P" H% Z2 j! i( r2 U7 w setup-cars; k; a7 { O H% k! ^1 L! E+ Q
set-car-color" _, \) j& M ]1 L5 Y5 D
record-data; d$ v* f) Z0 U# h/ B& w6 r: Y9 }7 p$ o+ `
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;; give the turtles an initial speed: M" k9 L" H% m A9 W D7 I1 m5 u
ask turtles [ set-car-speed ]& ~, d5 s7 J- p2 @
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reset-ticks
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: u0 F7 x6 c* B# T;; Initialize the global variables to appropriate values
; Y( H m/ f- V5 J' Z7 fto setup-globals( E. A" i8 [$ k8 i" M
set current-light nobody ;; just for now, since there are no lights yet1 w/ q" |8 {- c* e! z
set phase 0
$ m5 p% r. O2 C/ A set num-cars-stopped 0: C4 I( O' i: u( N8 c
set grid-x-inc world-width / grid-size-x" }) O h. @; A- D
set grid-y-inc world-height / grid-size-y
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( \1 Q1 t% X! a) q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
R) l1 _5 ]8 C. V5 X( G' v set acceleration 0.099
+ H! w/ F3 ~+ Dend
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" B+ r" e: h; c/ i( ~1 ~/ S;; Make the patches have appropriate colors, set up the roads and intersections agentsets,1 K' T) A6 J$ R
;; and initialize the traffic lights to one setting# R) p+ }- {* @
to setup-patches
; m* P" @* F0 | ;; initialize the patch-owned variables and color the patches to a base-color6 h" m$ a1 z% H- h
ask patches- W I$ L5 A2 k7 n( ?
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* c+ U2 u, i5 w, k Q/ L set intersection? false
$ Y r9 \/ X+ Q ]4 y5 L: \ set auto? false9 {- T7 b2 W4 [( l% O
set green-light-up? true
# ]/ y' L3 u: l2 ~ set my-row -12 R3 R! ?+ n: R% g
set my-column -1
$ v5 S$ }3 ]( m5 | set my-phase -1
& f/ a$ |0 W$ V% U# ^ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
8 o7 s k2 G( I' A set roads patches with
: p- G- v) ~: S% f5 P# X [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 T1 z+ U# O- o; R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! B0 F% l% e0 t9 c5 j set intersections roads with; f! ?9 O6 g3 o
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 c2 ?+ e. K; x6 J' u
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& } J3 Z; i: V0 I" k6 V
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?6 S' r" C. M- s: I* r* g7 s& A* t: O! E
set roads patches with
, O$ g4 P, q1 k* s( K [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 j" a! i% t' [. b' V (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: Y" c e/ A! C# i3 Z& S7 N/ p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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