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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。
R: i7 s3 w) h# G4 c. lnetlogo自带的social science--traffic grid这一例子当中,6 D5 r# @9 M6 [& v+ R/ d1 [4 b
globals0 R# Z' A7 \; j: r
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& k/ \3 R) t; x. t grid-x-inc ;; the amount of patches in between two roads in the x direction
( }* G* \9 d0 } grid-y-inc ;; the amount of patches in between two roads in the y direction6 F. \; V; W0 ~/ d+ d( c$ e$ L
acceleration ;; the constant that controls how much a car speeds up or slows down by if
+ W: I' w9 r1 J9 s6 E ;; it is to accelerate or decelerate2 d0 s( w6 c1 j* c3 k
phase ;; keeps track of the phase5 G3 W& ?0 j7 Z& N! l6 z" T
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 @7 d; Q1 B _# a1 k; O
current-light ;; the currently selected light r7 Y7 o, y6 z# r/ F. f
. L% A5 @2 K) h- ~, U6 Q ;; patch agentsets
0 f: R1 F8 A+ Z7 b6 s: v5 S' o intersections ;; agentset containing the patches that are intersections, s$ O" B: L- G+ S6 B0 _/ ^
roads ;; agentset containing the patches that are roads
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. f# N0 D: x% V) `: Uturtles-own
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speed ;; the speed of the turtle5 q: }# {/ ^1 A( q8 u
up-car? ;; true if the turtle moves downwards and false if it moves to the right* l* _- u' K! |1 \
wait-time ;; the amount of time since the last time a turtle has moved" p; }/ v( q. Z1 q* W7 W1 r5 Y* c; ^
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patches-own$ H1 g k: a4 v& t! M: @. g
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. z( q! H7 ^$ t2 e intersection? ;; true if the patch is at the intersection of two roads: g+ B2 [$ F% y9 f L/ [
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- m0 [5 Y# O6 J) O; h+ f, i ;; false for a non-intersection patches.
2 j$ \$ f+ c4 O- c my-row ;; the row of the intersection counting from the upper left corner of the
% Z. Y' ^6 f4 g3 E3 p4 v ;; world. -1 for non-intersection patches.+ M+ H4 m l5 l" N# m, h8 i1 G: W7 |
my-column ;; the column of the intersection counting from the upper left corner of the
1 B( n, X, e S5 @9 J' E ;; world. -1 for non-intersection patches./ P8 m. F" Y2 S, @
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
8 ^6 D9 M% M! T8 j: x& |. ~) f auto? ;; whether or not this intersection will switch automatically.
( w$ M! p$ S5 i7 y, Y4 P* A" W ;; false for non-intersection patches.+ }# m$ P3 K2 ~5 x) u2 e
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: p" I, C( H/ c;;;;;;;;;;;;;;;;;;;;;;
' o2 l6 R0 x8 v3 [& _- v;; Setup Procedures ;;- V2 H/ @1 E" A- q+ K+ k
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.& I& Y5 B1 {0 c% r# X7 A/ L
;; Create num-cars of turtles if there are enough road patches for one turtle to) Y5 ~% Y! Q9 U. q P5 v
;; be created per road patch. Set up the plots.$ Z! K+ Z9 _5 y' R3 E5 \% w
to setup
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setup-globals2 S- V" N/ _0 y, q! ?: `
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;; First we ask the patches to draw themselves and set up a few variables5 H4 P% Y0 {- u9 o7 G
setup-patches
. D; D2 F7 h" q7 j5 [. x make-current one-of intersections- J, ]# \& S7 b
label-current
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/ U* o" L3 G+ \% ` Z9 z set-default-shape turtles "car"( \( `. t/ @9 Q! I: U8 X
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if (num-cars > count roads)6 u* `) G9 i# Q* g& n* B
[
, a2 b5 d2 |: n0 N! O2 n+ f+ ? user-message (word "There are too many cars for the amount of "
5 G1 P8 ]5 E: U "road. Either increase the amount of roads "- j3 |4 y# ^" Y" B8 L$ N& X
"by increasing the GRID-SIZE-X or ", m7 Q" p9 n2 J2 l+ l6 ~ z
"GRID-SIZE-Y sliders, or decrease the "
; E: X- |6 d& ^, ^ "number of cars by lowering the NUMBER slider.\n"
" x6 j/ V) R% G0 @ "The setup has stopped.")
2 t' A/ x2 i+ e: K ?) _: W. v) { stop% k# F$ Q: F# q& P! v7 ]0 H
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- p' }) Z, T' i X4 ]/ V
crt num-cars
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5 L/ S3 ?' v* _9 V7 w4 [ setup-cars
0 v) Y" E/ [$ b. ~ set-car-color% X+ d r a3 C$ l
record-data
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;; give the turtles an initial speed2 E3 h* A# ~% f" h" S- S
ask turtles [ set-car-speed ]
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reset-ticks
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- y3 s& Z: t6 {4 R2 _8 Q;; Initialize the global variables to appropriate values0 p- R7 k( N- P7 `/ H& B
to setup-globals" e. c M$ l0 t
set current-light nobody ;; just for now, since there are no lights yet
# [& T+ O# ~* C3 b4 v! g" L2 s% { set phase 0
, d' D& j/ _/ I- Y* o9 q u/ G set num-cars-stopped 0
# E$ {+ w1 e* w% k' U; b0 G set grid-x-inc world-width / grid-size-x
# n2 H9 k: W' S0 } set grid-y-inc world-height / grid-size-y
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6 G: x' T7 q6 W1 k1 ]$ s( w ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( n5 i; g0 {- `7 L; g- Q# v set acceleration 0.099
- w7 H+ }+ N7 C" C3 v, xend
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$ V$ @, i" h& u;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 Z7 w! G% H, `$ k2 y! O;; and initialize the traffic lights to one setting
8 p$ O& |. S1 o( V' C) V- _to setup-patches0 ?9 B3 c2 m0 W
;; initialize the patch-owned variables and color the patches to a base-color+ L* F' r) C7 S |3 k
ask patches
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set intersection? false
7 C; H' ?' U$ D2 M set auto? false( ?, r2 _2 B/ L5 k/ h9 N
set green-light-up? true
4 R" Y: |% {9 u4 y" V+ R2 y set my-row -1
% l, K' J2 ?, C3 u, d# o- V set my-column -1
6 {/ y7 a# w+ G5 v# U set my-phase -16 V/ ]" [2 K; x2 b1 M1 M
set pcolor brown + 3. G4 z: u/ s% |6 q2 h2 ^9 Y$ l
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;; initialize the global variables that hold patch agentsets3 R. O, I* |) w" @& O6 W1 L* Y$ T
set roads patches with
0 G0 g! J2 E6 _( F8 p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 n; V8 R. R" k (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 _; t8 u p6 _" b: @# g
set intersections roads with W8 G, Y1 B0 @5 ^) |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; M$ v5 `1 v' _% J' p& s, q+ m
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. x1 g9 b- ~4 `1 G- W( Q) k2 C
3 H q3 [) ]2 Y" W1 O9 J( R& M2 n* m: m ask roads [ set pcolor white ]
- u0 L4 [, x' `6 ] setup-intersections1 e$ c" w G3 @% K/ O
end1 A. Q( s4 E5 ~3 x# {& Z
其中定义道路的句子,如下所示,是什么意思啊?- c) A" N, U/ P) c, O' _
set roads patches with7 x- o1 L9 W( n7 f( Z) f! @' ?
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ U- H$ T% W: @' o6 o0 }; e (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 c: m, X/ W- b! V/ q% a. N
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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