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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 c8 P6 n! g6 M- Q: cnetlogo自带的social science--traffic grid这一例子当中,# b% M# I A( T
globals% Z- I; W! ~8 s' T7 c( s4 S$ |; q$ `
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grid-x-inc ;; the amount of patches in between two roads in the x direction, |: m, j/ @" m- N" R
grid-y-inc ;; the amount of patches in between two roads in the y direction7 A; A' n' Y) z/ y: t* c
acceleration ;; the constant that controls how much a car speeds up or slows down by if% u5 \* k/ l( M5 d5 N& F9 Y
;; it is to accelerate or decelerate6 D" f) n/ G3 x: L/ J
phase ;; keeps track of the phase
2 A. v8 x# u3 S& v- B8 r6 U num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure: E% S/ Q& V' ^
current-light ;; the currently selected light
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: P" y8 \3 Q, R" d1 ^! ? ;; patch agentsets
, C# R0 P. B$ \" ?1 p# a- W intersections ;; agentset containing the patches that are intersections
6 V5 h% }( [" H' n2 V! w9 ~7 \0 Q" t roads ;; agentset containing the patches that are roads
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/ I6 V5 j- k: `8 c; [1 Q2 I1 Mturtles-own
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4 s+ E; P: b6 m, I4 C7 a! v" F speed ;; the speed of the turtle
7 z9 p) N; n4 ^ up-car? ;; true if the turtle moves downwards and false if it moves to the right% q$ M2 E" O8 ~; G) F: \: R
wait-time ;; the amount of time since the last time a turtle has moved3 H6 S6 v9 O; ~
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% D7 R( d/ U H7 bpatches-own
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8 R- i8 }$ |7 I6 u" J intersection? ;; true if the patch is at the intersection of two roads
( Y3 h/ ?) R5 G0 J, Q green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 l5 c4 k$ ]5 L8 a- Q; s& f ;; false for a non-intersection patches.
+ R& W; N4 ]8 E my-row ;; the row of the intersection counting from the upper left corner of the4 q k4 ]# w; l* Q5 W! m
;; world. -1 for non-intersection patches.
. B+ m) {: \: y0 ^ my-column ;; the column of the intersection counting from the upper left corner of the# D4 T2 ^: M& D
;; world. -1 for non-intersection patches.4 v0 `3 U7 @* Y' w$ u
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( ^/ ^* T- {; y% q) t, H. Q auto? ;; whether or not this intersection will switch automatically.
+ x) d$ u2 i' o, r: a$ d. L1 y# d ;; false for non-intersection patches.# P ~3 g8 E5 l
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;;;;;;;;;;;;;;;;;;;;;;
7 V+ z- k5 P% A' b# t4 A6 i;; Setup Procedures ;;, z: _- s q$ \* A8 c
;;;;;;;;;;;;;;;;;;;;;;1 }& r- f% l: j6 F# y4 u) l3 d
; ~/ }# [/ {; M8 [" d8 q;; Initialize the display by giving the global and patch variables initial values.
! H) o& M7 \( l" P: p- O h: _% z;; Create num-cars of turtles if there are enough road patches for one turtle to
: `$ R; e0 ^3 x5 n4 a$ I4 S;; be created per road patch. Set up the plots.' a) M* S6 T' f8 N) A
to setup
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setup-globals C' f5 ?- S5 j
' g( L. k2 S' M; p3 [. ^- c- q ;; First we ask the patches to draw themselves and set up a few variables# ~+ e" D% j- K# G! Z* _
setup-patches0 c0 d- a6 K+ x( z, Q
make-current one-of intersections c/ _5 J- ?5 ~2 ?( s8 P9 A
label-current
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9 \# _7 Q" I' }4 ]3 y set-default-shape turtles "car"
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8 K( m: @2 R9 L' U5 t) \5 P if (num-cars > count roads) W$ w X$ Q3 `% r; C/ ^+ B6 J/ K
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user-message (word "There are too many cars for the amount of ") J' s& i- i5 b3 G
"road. Either increase the amount of roads "' S. C: v( |) R, T. ]; P
"by increasing the GRID-SIZE-X or "
: Z$ N& k) p6 ~( \) l5 S "GRID-SIZE-Y sliders, or decrease the "9 J ~6 F. r! C. U( s
"number of cars by lowering the NUMBER slider.\n"3 a; l8 g7 d. m6 ]" H |
"The setup has stopped.")" M! G. Y& E8 `/ M
stop- ?6 x4 Z6 i$ i6 K& s
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: ?* h+ j# X% r* d: ^& _ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ `- A* W" X4 u8 W2 F, {
crt num-cars
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! r9 C" \2 D4 o1 I setup-cars0 ? f8 O b2 K
set-car-color
6 a8 m1 T7 K% R8 A: M record-data) H) b2 g) @2 V# k. G' z
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;; give the turtles an initial speed
9 r! k: E7 @! f/ I7 F1 `# f ask turtles [ set-car-speed ]2 I/ @! `. Q" d* \+ j
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reset-ticks
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;; Initialize the global variables to appropriate values' d: |( q9 W# E) P
to setup-globals+ d: g+ F3 v! K$ c4 d" ~
set current-light nobody ;; just for now, since there are no lights yet
9 s8 u# S3 q0 D7 D: z7 E set phase 0; _9 P* m; i0 t3 a# W
set num-cars-stopped 0" \8 t( d7 m; B1 N( e9 A
set grid-x-inc world-width / grid-size-x8 A3 N" N5 R; v- W# R
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; Z8 W) r) ]- s& E
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets, B6 ~: {8 ?) h- N( ~0 o
;; and initialize the traffic lights to one setting
- k5 {$ X( n" N) B7 F8 O0 ~to setup-patches
7 p( n7 ~/ \ j' \6 y+ s/ N/ Y ;; initialize the patch-owned variables and color the patches to a base-color
3 T( b( g0 j; X4 N6 L ask patches* f$ V- S* f" I
[
1 Q& v& T: n. g set intersection? false- d, M3 u- ]) M) O
set auto? false. e# H; j5 K$ L x. p$ F# _3 ~
set green-light-up? true% L X. t+ X3 q0 n$ c' ^
set my-row -1" O( g) f, [: x4 U6 r: `4 X8 {: \7 a
set my-column -1
0 W. M3 F# l1 ?8 {8 @1 x- \ set my-phase -1
: g5 X4 D$ P9 x D! k set pcolor brown + 3: P( S R- ^* p
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;; initialize the global variables that hold patch agentsets
X# W3 m/ Z [# | N set roads patches with
. \2 q) K5 s# E1 o9 R- t [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, K; ~& \* K+ P% x% @4 l
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 U% R+ T: i6 ] Y, g2 v
set intersections roads with
5 k Y$ b* V& k F; B( o- b* v9 J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! @) Q: g! |7 v3 k8 i0 Y( K6 z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( c' Q8 ~4 b8 m. A
P6 m2 I6 p% y8 F8 j ask roads [ set pcolor white ]
3 ]8 _/ q* t; q4 c( B3 ? setup-intersections
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3 V( S4 f4 r; ?$ {/ w; V其中定义道路的句子,如下所示,是什么意思啊?
9 ^, m0 M- f% [" ~1 V. o set roads patches with# A# A/ Z5 Q0 Y- S$ o3 {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! Y: d4 O$ K* Y$ c& |/ Z/ n9 q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! y" i7 d! r0 @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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