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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。
0 ^3 m' F. f8 u! Bnetlogo自带的social science--traffic grid这一例子当中,6 Z" Q9 y6 d7 D' y! p
globals/ m$ p6 }% Z8 ^. c; P
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grid-x-inc ;; the amount of patches in between two roads in the x direction
3 d! a3 H/ B! O2 P grid-y-inc ;; the amount of patches in between two roads in the y direction5 W ^% j( B5 }! \6 @+ V. L
acceleration ;; the constant that controls how much a car speeds up or slows down by if* d* {3 k4 t5 o0 t8 e
;; it is to accelerate or decelerate
' B7 {- u- g& ^# C& {' N phase ;; keeps track of the phase7 k" F5 L# m2 k+ T1 b" ]
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( M3 i) h; j, `7 T& V
current-light ;; the currently selected light1 d; h1 X! N6 d9 I2 e8 a
- W7 r% y' ~; U5 N ;; patch agentsets9 V/ t' I% N) ~% [ b
intersections ;; agentset containing the patches that are intersections
! _& U h" K# @- P& n+ g) } roads ;; agentset containing the patches that are roads+ [% _! V5 a1 U" s- `% Z
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turtles-own
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speed ;; the speed of the turtle
. @ W! B9 L3 x: d& v$ s) n up-car? ;; true if the turtle moves downwards and false if it moves to the right/ P- K0 y2 s* r: N
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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9 Y7 p- g% Q5 u4 d intersection? ;; true if the patch is at the intersection of two roads+ K" R) Y4 p& L- [, h/ O
green-light-up? ;; true if the green light is above the intersection. otherwise, false.3 k$ ?. ~8 B0 E) ^
;; false for a non-intersection patches.
2 J7 _) Z2 c4 z3 e2 w' U my-row ;; the row of the intersection counting from the upper left corner of the$ r* b8 O# [9 g% n- e7 X5 _
;; world. -1 for non-intersection patches.
' X7 ^0 W, Z4 J" b$ D$ q; S my-column ;; the column of the intersection counting from the upper left corner of the6 ]6 ?9 g, B! e7 O9 y
;; world. -1 for non-intersection patches.
# l) c( z" t. X, b: ` my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" [6 E, E9 a& D9 r6 ~! e B0 G/ { auto? ;; whether or not this intersection will switch automatically.
; \1 O7 N( q) j: l, | ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;' F5 G. m# u3 W) f! u! }
;; Setup Procedures ;;
. I8 [$ A3 l! ?' o- A# H- g8 o;;;;;;;;;;;;;;;;;;;;;;
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: y- x/ v# {. d( ^! g; n5 p7 f;; Initialize the display by giving the global and patch variables initial values.6 z U& u" p" S+ X& x5 y; R- Q1 Z' \
;; Create num-cars of turtles if there are enough road patches for one turtle to
# _* }4 o% g/ i$ W2 Y- n;; be created per road patch. Set up the plots.
% l* a- z0 J- H# B- H& |, T8 T% `/ y6 Vto setup
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5 W3 f8 [8 e5 y7 ^ setup-globals& t P3 N! ?8 A8 V/ f
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;; First we ask the patches to draw themselves and set up a few variables0 N9 z& X" `, E$ z* R1 j. p, R' j
setup-patches9 i& g/ s" r" w& M/ d$ s' k
make-current one-of intersections: `+ i$ j0 k8 q: }" \( F- ?* M
label-current
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set-default-shape turtles "car"3 ~2 a' X; N: _; C3 Q1 I0 I1 D1 ?
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if (num-cars > count roads)
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s9 x# v$ N& \4 h: v user-message (word "There are too many cars for the amount of "
* P( }# @1 m8 ?0 q4 Y3 r "road. Either increase the amount of roads "' Q Y( J/ @) K) Z' ?
"by increasing the GRID-SIZE-X or "
' t& P* M# E/ T4 y$ Q+ @ "GRID-SIZE-Y sliders, or decrease the "2 i) e4 i) I( c- K1 x0 |$ \( X
"number of cars by lowering the NUMBER slider.\n"0 [3 x) L8 s8 _7 I/ [' J$ j
"The setup has stopped.")% |6 w3 D' s0 k3 Y# z) U* F0 p7 I
stop
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, L! @( e6 y% j- t4 |5 f2 h1 d9 J ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color \/ U! ^4 V- i7 U* j
crt num-cars3 z$ H* Q0 ?7 q$ m
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setup-cars9 {! {5 E8 i' h* J3 D3 ~
set-car-color
7 t$ h. C" C( O+ f record-data
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2 p% r' l" [( e5 D6 d ;; give the turtles an initial speed
9 J" a; Q/ H: H2 w ask turtles [ set-car-speed ]
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reset-ticks4 n5 w2 [' I; e5 P" {" k% f
end' E' `$ V5 D |% {: C' F& t2 j
3 M7 K9 a6 F5 ^9 |# k;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
* |1 f1 ?5 D3 ^9 b set phase 0. O+ W( Z, s8 n& Z/ }$ d
set num-cars-stopped 0: r9 P/ c0 b V0 h' }
set grid-x-inc world-width / grid-size-x( B9 ?& P6 Z3 X! n* \
set grid-y-inc world-height / grid-size-y; p* D, K3 W+ P4 ?; r6 R
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ [2 `; I9 @# _* I% x' [/ l0 A" Q set acceleration 0.099
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, U2 U+ w. [1 M6 h0 N8 M;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- o4 y/ a& q2 U8 q;; and initialize the traffic lights to one setting
7 t7 x( e0 D4 lto setup-patches. ?8 J0 w$ b! S
;; initialize the patch-owned variables and color the patches to a base-color
- y, Z0 ^8 Z7 d5 B$ P' M9 A ask patches
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9 t+ p( F9 x C( s" ] set intersection? false9 T! U$ M* ^6 C: V
set auto? false
5 M G0 Z' k* c z1 f. ]$ x; T; Y set green-light-up? true( A4 M+ u0 u/ r7 P' c: h. _ ]6 a
set my-row -1
6 l: N- z9 L3 b6 t9 Y+ x2 v set my-column -10 d- w: X$ ^. w! J, Z1 ]. X" X
set my-phase -1
5 Q! A- y* M% } p9 Y4 L# l set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
( d3 d7 W1 q3 X8 L) M4 m% k% a set roads patches with
" a4 g. {* }1 v5 p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. j( Y; \- k; p9 N9 C+ {) s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 X) k) J1 y: a6 n
set intersections roads with
. ?) z. Y- I3 V& o8 ]& x& I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and6 d; B2 ]3 d6 ~$ a
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]9 v; }" q U9 l- j0 C# x; g' o
setup-intersections
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1 H7 J$ D2 v- i+ N, i; k5 N2 T: M其中定义道路的句子,如下所示,是什么意思啊?
% N" Z: Q# k% e8 I8 s9 e& i1 d! M+ v set roads patches with
! }# T$ D; M i4 J, @( h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; c& W9 m9 ?+ t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 R( F3 }! \) B' h
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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