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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。+ J- E( N6 h- r/ Q5 R9 `" O
netlogo自带的social science--traffic grid这一例子当中,' r/ s3 Y& ~4 x
globals
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( C6 S7 }) D J2 r* }$ c grid-x-inc ;; the amount of patches in between two roads in the x direction
$ {5 v. \1 l6 u grid-y-inc ;; the amount of patches in between two roads in the y direction
; \$ {. b+ C2 m# w0 R' e acceleration ;; the constant that controls how much a car speeds up or slows down by if0 F2 H: V, a$ q
;; it is to accelerate or decelerate2 u+ Y# x8 g9 e0 l
phase ;; keeps track of the phase, Q2 g) Q1 t7 C+ T B- y6 G
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure: l; ~2 k+ A9 P. @
current-light ;; the currently selected light
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/ ]$ [# j2 V" t- f1 y ;; patch agentsets
% c) i7 I2 Z1 R: L: c; H& ]$ n intersections ;; agentset containing the patches that are intersections
/ f1 G4 n# ]! L& V' |4 U$ B0 q roads ;; agentset containing the patches that are roads' P/ h1 i, ?: \5 E9 |2 q: }
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1 i! Q6 c! r2 w8 Yturtles-own7 q7 K% K: N f3 t8 s/ v# e
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speed ;; the speed of the turtle. g" o! x2 \ I+ O6 s4 c1 h; }0 l& H8 X
up-car? ;; true if the turtle moves downwards and false if it moves to the right2 d4 S; Z# T% Y; T/ q
wait-time ;; the amount of time since the last time a turtle has moved
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( ^" v3 g, e4 K# F0 p! h- X2 A" opatches-own0 z$ K. n* G4 u6 [; n6 B) {/ z
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1 L# D# Z8 B/ _4 X intersection? ;; true if the patch is at the intersection of two roads
- ^& r, {4 H- y; u9 u green-light-up? ;; true if the green light is above the intersection. otherwise, false.
/ j) E1 o2 g4 N3 r7 {3 Y/ Q# g9 C ;; false for a non-intersection patches.! r X6 E' l" ]9 x1 h J( g6 c
my-row ;; the row of the intersection counting from the upper left corner of the1 M3 j( C7 |+ u1 p0 {
;; world. -1 for non-intersection patches.; n; i* r/ x; ^9 D( N' X
my-column ;; the column of the intersection counting from the upper left corner of the
- e! v4 N8 ^* Z1 N ;; world. -1 for non-intersection patches.
1 \ P8 [' y$ @% F* O/ e my-phase ;; the phase for the intersection. -1 for non-intersection patches.
& q& e' ^8 G. e% \ x auto? ;; whether or not this intersection will switch automatically.2 L2 b6 D: z1 ]8 [/ J8 _& N& G
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
" H7 W' ?' n4 q# j! U K" c;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.% m9 Z; o( j9 Q+ ]" M2 Q
;; Create num-cars of turtles if there are enough road patches for one turtle to/ i' A- `8 b- n6 D: U9 t. \$ x
;; be created per road patch. Set up the plots.
' R% h: i# c2 g6 v) R4 T% m$ tto setup& z/ I( Z& g+ f
ca
; k$ } E& Q9 j/ o: U3 [ setup-globals" _; [! h; s& {& p" z
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;; First we ask the patches to draw themselves and set up a few variables2 o/ {2 q7 B1 ?8 p% n
setup-patches
% \$ U" \- W1 |, q; H. t make-current one-of intersections! t( D1 n$ N3 c- t. T/ W8 j2 M
label-current1 ^: c( r' d$ W: w
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set-default-shape turtles "car"
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# g- ~* [' @- ~/ i3 e if (num-cars > count roads)
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8 {" i6 g" H% m, u' D user-message (word "There are too many cars for the amount of "
6 H) g* j) U( N( |6 d# g* G& `7 g "road. Either increase the amount of roads "# {: C3 Y5 c0 ?6 r) U! I) t
"by increasing the GRID-SIZE-X or "- E; `+ t% R% n4 {" }6 W5 C3 y0 s
"GRID-SIZE-Y sliders, or decrease the "/ e% V* z; @; ~! ]3 `$ L& d
"number of cars by lowering the NUMBER slider.\n"5 T6 ?) A. D- ^; W* ~+ j
"The setup has stopped.")# r2 M) ]. U Q0 z) Y0 r
stop
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( A- f: ?5 s7 U6 ~ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% N1 c/ K% x1 T7 O2 f5 M
crt num-cars
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0 K3 s5 v, k9 y6 K8 s/ T# q setup-cars- O1 f/ R: y7 z$ z+ ?
set-car-color v+ O0 g; x2 I$ Y$ w9 ?- r
record-data
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;; give the turtles an initial speed: d( O3 o( i6 z
ask turtles [ set-car-speed ]
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reset-ticks
, p) W) [+ d3 Jend
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;; Initialize the global variables to appropriate values- K1 A4 e# b; J, k( M
to setup-globals
9 C5 p) X3 n" u$ W8 E" p set current-light nobody ;; just for now, since there are no lights yet
: v8 E( O; O4 o2 d. T" n6 t, v2 O set phase 0
7 n2 v5 x1 C, D9 t set num-cars-stopped 0
U2 u7 M- L. e; {2 F set grid-x-inc world-width / grid-size-x. u# Y6 U. `4 j4 T: B; H+ H
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
- c$ i5 [. @+ G! A set acceleration 0.099
& b- u' q4 W# U/ ?end {/ \' n7 X4 X
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 Q. g1 Y! E1 Y+ N& Q& H& ]
;; and initialize the traffic lights to one setting
8 y3 h6 i" R* ato setup-patches
( Y: u. v8 ~( ^. c& p% P( b ;; initialize the patch-owned variables and color the patches to a base-color! g4 {( R- m9 i2 I3 u
ask patches
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set intersection? false
! J) a g3 P M: R9 f- T set auto? false
2 n' I0 C% u2 X Y" k$ \ set green-light-up? true1 ?' X! F) s9 x' u$ s0 U
set my-row -1# Y1 S" d7 `! W3 O& C/ ^
set my-column -1
I2 d' K4 K$ Y set my-phase -1
- M9 A& M8 q, X% @; b* Q set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
3 t8 {9 y: T1 y8 G/ m5 K9 @ set roads patches with
7 T* ]1 N8 L$ Y" x" O0 H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& Y) ^! T3 a0 u( z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# F0 X( f K+ M: P! Z# ?
set intersections roads with
" v1 N6 _" f j# z; ?3 f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# E# [& {9 U% L/ R J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 V2 A' E# U3 B3 j/ F
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ask roads [ set pcolor white ]
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end
9 L0 A4 v3 T/ {# f* \! u8 X其中定义道路的句子,如下所示,是什么意思啊?. o# Q0 {: Z# w3 b/ g& {
set roads patches with
+ Z! L* b c0 Z" a1 b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 F: |7 v" m; J* d, J9 _ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ r$ ^* A! R( r$ U3 ^8 u% i
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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