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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。
5 {0 e" y8 N, Gnetlogo自带的social science--traffic grid这一例子当中,
- X1 v& ~. b/ d4 q- |2 n/ {4 I" Aglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction9 L1 c4 F0 ^) d; s) n( p7 t8 N
grid-y-inc ;; the amount of patches in between two roads in the y direction
W! S/ f8 O+ ` acceleration ;; the constant that controls how much a car speeds up or slows down by if" O8 L9 v0 l$ p9 T
;; it is to accelerate or decelerate \: G+ I7 e* J/ n4 v5 Y, i6 [, L
phase ;; keeps track of the phase
: ]! d& L# S7 i2 i9 M num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ b: f! k* k: k! P- U8 S% Y8 [ current-light ;; the currently selected light/ r1 H9 ]# `4 w" S, P+ U8 \
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;; patch agentsets% b! p, T4 v, n3 s; ^
intersections ;; agentset containing the patches that are intersections2 k+ }1 u9 Z3 ^; s' C# `
roads ;; agentset containing the patches that are roads+ G$ w/ ]4 T, p, k0 c8 i
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h: h7 l0 S# w6 c! E+ f" v; rturtles-own" } K" y( f) { X6 V% Y7 e& q0 k A+ e
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speed ;; the speed of the turtle
8 y7 k7 N3 _2 J- ]2 U up-car? ;; true if the turtle moves downwards and false if it moves to the right1 x5 S7 U. D, l3 Q5 D
wait-time ;; the amount of time since the last time a turtle has moved& A2 d1 A% {" {9 I! s
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patches-own
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`8 d$ q# D9 y- ~ intersection? ;; true if the patch is at the intersection of two roads
# X2 m$ K4 S$ H7 M green-light-up? ;; true if the green light is above the intersection. otherwise, false.
c t5 ?2 Q0 L& s. A ;; false for a non-intersection patches.# t6 x0 p) v& w& ~8 w6 g' `* X
my-row ;; the row of the intersection counting from the upper left corner of the
: o- |, Y( {) Y! O( o; ]; R ;; world. -1 for non-intersection patches.- n) ]8 [, n9 Q6 u9 U1 P: F; y V; C
my-column ;; the column of the intersection counting from the upper left corner of the8 B& @) J( Y B, I- y \
;; world. -1 for non-intersection patches.
4 W, Y# o9 X4 ^9 Q, p my-phase ;; the phase for the intersection. -1 for non-intersection patches.+ ^% b2 ~' P! o+ N; o: Q
auto? ;; whether or not this intersection will switch automatically.- I% C6 ^" l. m _. Q' h
;; false for non-intersection patches.
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7 S7 y) n4 l# U& e2 P;;;;;;;;;;;;;;;;;;;;;;: P: u. n8 O# F4 } ]! {& t9 g- \
;; Setup Procedures ;;' F# X1 o+ K2 ]4 L
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
' g: V# q3 g/ W0 d# e;; Create num-cars of turtles if there are enough road patches for one turtle to
+ `3 L6 f' e1 M4 l G* y9 b' m;; be created per road patch. Set up the plots.0 r4 `+ t) V8 ?' _6 n6 X4 a
to setup
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2 g1 w' I, k& b setup-globals7 r1 z* b. h) P; N
! Q: \2 w( \6 w8 m+ ? ;; First we ask the patches to draw themselves and set up a few variables
& z4 H* n v" F$ B$ ^+ y setup-patches, o# ~7 R. M; G# T/ @" e0 W9 P* M
make-current one-of intersections% D* Y, o0 h5 F. b7 j( i) C1 ^/ f7 R
label-current
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1 Z% o( y" ^. N7 y set-default-shape turtles "car"! C/ }" |' d7 {! G
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
% B2 H4 z5 c6 f; ]9 l- n "road. Either increase the amount of roads "2 f5 w" ?1 l1 w
"by increasing the GRID-SIZE-X or "
( `2 I: ]* ^. ]% W "GRID-SIZE-Y sliders, or decrease the "
9 w5 ?9 l9 P9 m2 e; q "number of cars by lowering the NUMBER slider.\n"
0 s6 o @% }, D4 p) q "The setup has stopped.")/ V" ~; H0 J: t' V0 I; g
stop7 R# @: ~- y& l) F$ I+ v( M
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: h6 d% d- B1 W' k& _' D crt num-cars
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setup-cars' k2 c) ^$ R$ v9 y
set-car-color
5 e. x1 n. f ?1 u% ?1 t record-data
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5 `- l6 Y/ u0 Q ;; give the turtles an initial speed; K! y2 H1 {. x' \7 T9 ?1 s
ask turtles [ set-car-speed ]
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reset-ticks6 \+ ^9 C8 O! H; S! Q' L5 R
end4 e- F& E M0 Y
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;; Initialize the global variables to appropriate values& `# x, b1 Y9 {) R: q; m; u
to setup-globals
- d* H- N6 q" A# m set current-light nobody ;; just for now, since there are no lights yet" a1 M; S) e8 U2 J K8 w
set phase 0
" |. ~+ c$ r# z6 ~- i1 U) r, X set num-cars-stopped 07 K+ z; P8 z% d1 q ^8 b& F6 M
set grid-x-inc world-width / grid-size-x
) V/ x3 N7 c" J4 z set grid-y-inc world-height / grid-size-y6 G) z0 O! {# p- o
2 N3 U- [8 m, U F ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) [# T s* S' G. L1 l set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,7 I+ i( B2 W: ~" D" T
;; and initialize the traffic lights to one setting! [9 m3 b1 V Q5 D* K
to setup-patches
( j- }; j5 a1 I2 G. d ;; initialize the patch-owned variables and color the patches to a base-color
- u7 U3 E* y' j$ Z3 \! q& r ask patches1 ^! K9 A' k- {* ]+ J' B9 ]" G
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set intersection? false2 W9 `: K+ _% N) P5 ~. d: e% n
set auto? false9 P/ d8 y' X, s) i* A% g+ M
set green-light-up? true1 }/ @- N4 I2 D% g
set my-row -1
3 T# `, z$ Y( R, c# f set my-column -1
! E" M7 j4 Z, k* @) m; t7 E set my-phase -1 I+ P# c6 j0 C! N+ I9 f K
set pcolor brown + 39 q5 p; E. A6 L- }/ j
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4 I! A# I* k# P ^- c( I* _ ;; initialize the global variables that hold patch agentsets$ I4 I0 V) r. y8 K$ K
set roads patches with
2 q3 P* X0 \4 V% j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& v5 R4 B A: o( B. c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 F2 K: K u q! Z* ~ set intersections roads with
: l4 N2 U H, {$ \' a [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ Y# g% k2 a( H: f C% x (floor((pycor + max-pycor) mod grid-y-inc) = 0)] N \! f* `2 w- Q6 }1 \+ d# R
# y& b6 p, G8 X" U7 P5 W4 I ask roads [ set pcolor white ]. g- ]8 c1 Q# S8 i5 ]
setup-intersections! n5 y3 g8 C7 I, R4 e9 J& S$ n
end" Z' n+ }' x q( w) W
其中定义道路的句子,如下所示,是什么意思啊?. v5 I5 g$ R7 x# V# R# [7 X
set roads patches with, U( V2 w2 U# @, V7 x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: q, [ I# ]6 C, u) q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], E y( f3 G8 ^: w3 h1 N4 c8 ?
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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