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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。
* a& \0 L7 O# }5 r" d: Fnetlogo自带的social science--traffic grid这一例子当中,
; E' X7 n; L% j3 Aglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
1 Q9 e1 ?: n3 a' Q grid-y-inc ;; the amount of patches in between two roads in the y direction
* K6 C6 k- J4 r; U7 C acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 i( B3 `* x- K6 Q$ |% w* f1 l& F ;; it is to accelerate or decelerate
. L5 ~, B& x$ I0 t phase ;; keeps track of the phase9 C, \$ F' y% V7 Y3 L6 `1 x
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& _6 Q; U0 x' [4 Z/ c4 ^ J' `
current-light ;; the currently selected light
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;; patch agentsets7 N- ?5 F# O! a+ D- L
intersections ;; agentset containing the patches that are intersections
0 {9 f, X, B3 n) B roads ;; agentset containing the patches that are roads9 F. J, J# Z. i
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* o u6 E2 S) g5 mturtles-own
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4 Q& W# R3 a' n0 c" b speed ;; the speed of the turtle* z4 n% F( \) p) o% |
up-car? ;; true if the turtle moves downwards and false if it moves to the right; v+ H" Q* ~& j7 b# {' b
wait-time ;; the amount of time since the last time a turtle has moved5 h0 i+ u! E# ?' j. Y
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patches-own1 q ]' {! H# }
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intersection? ;; true if the patch is at the intersection of two roads
8 K' \& B" W* [% N z& i' Y1 r green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 h, F& t( P9 {% k
;; false for a non-intersection patches.; | X' H% h( U0 _, |2 w" N& H
my-row ;; the row of the intersection counting from the upper left corner of the* D7 O0 g( k* W0 n2 a% R
;; world. -1 for non-intersection patches.2 R5 r0 \ i; t% \$ }' G L+ W
my-column ;; the column of the intersection counting from the upper left corner of the) U" t, D; z. h
;; world. -1 for non-intersection patches.
7 A% `, D0 A+ H! t, h my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 A3 u! R' b4 G p3 i/ P auto? ;; whether or not this intersection will switch automatically. l: n' o6 P! n3 S8 I6 m) @
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;. y: M9 [8 {$ m* W3 U+ C+ H
;; Setup Procedures ;;
3 W" }' H1 q( v/ A5 _;;;;;;;;;;;;;;;;;;;;;;
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0 j! d4 p. i. G' G3 X: };; Initialize the display by giving the global and patch variables initial values.
, F+ ~+ `" E8 p, V, k2 A( D+ L4 k;; Create num-cars of turtles if there are enough road patches for one turtle to8 I/ Z2 v# z5 _ T8 v6 o
;; be created per road patch. Set up the plots.7 }; r6 x& t, X: F
to setup9 m. K' K1 W- g+ b0 _
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setup-globals
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E" ]) q1 Q2 Z) y+ P" ^ ;; First we ask the patches to draw themselves and set up a few variables
# v$ W W# b& K+ C, _ setup-patches
8 H, M0 q% V) X& j) J( s5 Q% U make-current one-of intersections
. g6 F4 Y/ {3 D9 v. E5 F label-current1 c. g9 g5 `1 b
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set-default-shape turtles "car"" D: _; S0 y, c9 [
, O2 x: t6 m. @- C: J( q9 B2 [* c if (num-cars > count roads): J V# u7 _" ]+ b
[
- L5 N6 {/ g6 f$ d! T7 G5 ~, c user-message (word "There are too many cars for the amount of "
$ p! v% b. Z& B7 Z: T7 v* C+ h "road. Either increase the amount of roads "( o$ a% X% s# f* N( r4 ~! A! W" D
"by increasing the GRID-SIZE-X or "5 R- \) q8 P, B/ {1 X7 P! c: _$ g) [
"GRID-SIZE-Y sliders, or decrease the "
4 w; E. [) ]/ r( w9 A# q "number of cars by lowering the NUMBER slider.\n"& x3 l, k, j; f
"The setup has stopped.")
1 z# K& z. Z+ z/ g/ ` Q stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* ~9 Q$ s* N. K5 }. |+ r crt num-cars2 p; k; W: M9 l. b
[
6 r/ G5 x$ G/ o8 X* N* G setup-cars
$ i5 A! s+ a+ C( V& V/ H set-car-color4 T3 X7 ?- r8 ]
record-data
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;; give the turtles an initial speed
# Q3 M" y' l5 z1 Z ask turtles [ set-car-speed ]
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reset-ticks- t2 J8 t9 ?) Y0 ~. l
end- a, K; w9 z4 p( K
3 D* r9 s6 R( Z1 S0 X, P;; Initialize the global variables to appropriate values) r/ ?% W! f* `4 s q- ]
to setup-globals
4 E2 S/ D; }/ @( ?; Q# \3 f set current-light nobody ;; just for now, since there are no lights yet
7 N. k+ x& o: J set phase 0; I0 d0 g/ M. O
set num-cars-stopped 0! t8 ]' ~/ c1 m2 ~/ f, U
set grid-x-inc world-width / grid-size-x
3 w0 j- c5 s/ z set grid-y-inc world-height / grid-size-y$ o# V' b& c- }
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) [& x" I2 C/ ]2 @
set acceleration 0.099
4 D7 i7 U8 Z6 @9 ?end, U# D/ S! A! ?% m+ Z
8 M! Z) e% k: k4 u8 [;; Make the patches have appropriate colors, set up the roads and intersections agentsets,3 s! a& C. P$ t: _' ^
;; and initialize the traffic lights to one setting6 ~$ x( D! g& B6 h; \, ^1 d) L' D U
to setup-patches
5 `, [, J8 R [ ;; initialize the patch-owned variables and color the patches to a base-color
0 b3 {& }9 R, I y* b5 y5 h ask patches7 I; o& o1 m2 h+ O
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set intersection? false( ^# [% T, L% d! N7 l: z/ }6 {
set auto? false
2 m2 ?! h) q/ ` set green-light-up? true( r: A# o% x) Z" N( e
set my-row -10 B, W. _: u E6 Z/ F2 C3 G
set my-column -1
6 L, {! H5 m- M* g$ F set my-phase -1% K0 R$ o9 [8 U( R, `/ B- \2 E
set pcolor brown + 3
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; j. [3 {6 r# P+ I, P8 [ ;; initialize the global variables that hold patch agentsets
9 K% L; t& m* y3 a set roads patches with; G. [' M& M+ o$ v. \( }# D/ r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* C2 w3 c% h4 D' w* Z (floor((pycor + max-pycor) mod grid-y-inc) = 0)] J% W) F Q* z" a0 n3 T1 N
set intersections roads with6 y& T7 h! q& I g' ?
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; B4 f1 M D# i% p* @
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 c1 X7 Z$ p3 f: e( E' b
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ask roads [ set pcolor white ]
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/ S' h+ l* |; Y- K" K其中定义道路的句子,如下所示,是什么意思啊?7 b+ W- D. ~7 u! U; h* \4 e
set roads patches with
5 v$ l4 ~0 D Z& O( e- `& D [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 {/ z; h% Q! B @# {! L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 _3 W5 I* D" e5 Q, {& j# W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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