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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。2 p* i0 Y/ {; O/ \) j& T. R- X
netlogo自带的social science--traffic grid这一例子当中,/ h8 Z; K C6 t& F7 R6 _
globals) a. E" G, M, L5 m, @( |) P3 S
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grid-x-inc ;; the amount of patches in between two roads in the x direction: N$ p6 t& v7 L
grid-y-inc ;; the amount of patches in between two roads in the y direction# Z: H" W- a* l: v
acceleration ;; the constant that controls how much a car speeds up or slows down by if
?1 ]" K& V8 y, S8 K ;; it is to accelerate or decelerate$ u3 w% r7 z9 Y: j) U
phase ;; keeps track of the phase
! M' P# {/ c+ } num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure/ s# l+ K# k) \
current-light ;; the currently selected light# K! z5 D% \' L7 P: v2 y
\. }5 E9 {7 [ k8 D) v% H' G* t ;; patch agentsets
/ o @# d6 f, ~% x, Q$ ` intersections ;; agentset containing the patches that are intersections9 T; I7 O& s5 T: Z% B: \9 x
roads ;; agentset containing the patches that are roads
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" x& x6 |; N4 K& w6 i! P' M* L9 W- s+ U3 ?1 N, I( y4 ]) [( [( i# i. \
turtles-own- ^" y8 J j3 \& ]8 U. D% G' A$ J( l1 `
[
0 ?2 y8 U% k; s" q/ `1 T. c speed ;; the speed of the turtle
; p8 D( K9 ? |; ] up-car? ;; true if the turtle moves downwards and false if it moves to the right$ i/ ]4 i8 a, P
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own3 i$ _/ M: B3 a
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intersection? ;; true if the patch is at the intersection of two roads0 {! L* {! G b3 X2 U0 [: s
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
. ^# |* t. p9 q+ X8 }4 A3 y ;; false for a non-intersection patches.
6 A0 d& H$ Y2 F, d my-row ;; the row of the intersection counting from the upper left corner of the/ _. j, k- k! l0 h" {$ r
;; world. -1 for non-intersection patches.
, z# [( }& y: q4 x- L& e my-column ;; the column of the intersection counting from the upper left corner of the/ ~/ V" }3 W/ V8 S4 K2 b: T4 P
;; world. -1 for non-intersection patches.$ L$ u+ k4 s( c5 q* M: @
my-phase ;; the phase for the intersection. -1 for non-intersection patches.- P* |+ Y2 i( _3 z* C- N
auto? ;; whether or not this intersection will switch automatically.9 [2 p! F) h: [1 g
;; false for non-intersection patches.. P9 f3 }+ s* U& [, u* g
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+ G1 z( B* W6 X$ v3 ^; v;;;;;;;;;;;;;;;;;;;;;; ?# g" e* A/ c& M. F+ \: A
;; Setup Procedures ;;
! I5 S- P& \: t1 n( ]( v6 Y/ U6 D;;;;;;;;;;;;;;;;;;;;;;& o4 G) T7 h7 y8 a# H( ~' \
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;; Initialize the display by giving the global and patch variables initial values.# O( K6 t$ J: ~. X, m* k8 y
;; Create num-cars of turtles if there are enough road patches for one turtle to
- T" @! ~+ `" N$ `, v' u;; be created per road patch. Set up the plots.5 r. ~8 n* F N. L- B* P9 y" c
to setup% K5 N& t4 {# B# m6 Z
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
1 l9 u/ ^: t# [+ r: U ?5 L% n( Q setup-patches; W, h" [ {) |0 \' {% q
make-current one-of intersections) F7 s# v/ X1 u3 V8 i# t
label-current
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G& M0 n" G' H( I! j3 e- g set-default-shape turtles "car"
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6 o1 |6 e6 g/ a/ g' s if (num-cars > count roads)& \8 |: G1 w/ r, \, u, B8 K7 [9 ~0 [
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user-message (word "There are too many cars for the amount of "
9 N0 f5 ~8 c4 b1 I5 \ "road. Either increase the amount of roads "
+ S4 ^ }+ ?! a "by increasing the GRID-SIZE-X or "9 [0 e0 E8 l* {/ J9 p8 S' \
"GRID-SIZE-Y sliders, or decrease the "2 a& u8 L" k3 c% R" j
"number of cars by lowering the NUMBER slider.\n"
( ] r A x: O L7 u* J. V7 M "The setup has stopped.")7 |# T2 M. Z. O {
stop, G7 [0 B7 x+ K- g% H( {: v+ n' X
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) r8 s9 J3 k9 _6 i) m/ I crt num-cars
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& G+ {: j( z. k: x/ S+ o$ v# E2 Z setup-cars
# u# P6 e. N* W5 P, x set-car-color% X6 I) e) v/ e* R c4 r. |
record-data7 X, N/ r$ j9 V9 K
]
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;; give the turtles an initial speed
2 |: w9 ?1 e n/ ^5 S7 ]6 ] ask turtles [ set-car-speed ]* k$ X4 N: ]4 o8 ?9 d# B7 A$ U
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reset-ticks
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;; Initialize the global variables to appropriate values
' c. p" U' r/ ^" |to setup-globals& W+ v- G) w% H
set current-light nobody ;; just for now, since there are no lights yet; t: W* Y- v M; V, w/ j5 L" I
set phase 0
4 h% U0 A3 y) T5 } set num-cars-stopped 0! R& | Z1 O" N3 G$ I* ?: s, F
set grid-x-inc world-width / grid-size-x
8 ]8 x& Z& w H0 R set grid-y-inc world-height / grid-size-y" _& a4 y( h, M: t, A- B1 |
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary4 t% h% x% f$ a' V5 v- s6 {0 K
set acceleration 0.099. M2 s8 }5 k7 X& Q
end
; Q# F6 x9 q% v
' y) X7 F& w- y! E;; Make the patches have appropriate colors, set up the roads and intersections agentsets,3 N1 @% C1 X* Z! G
;; and initialize the traffic lights to one setting9 |7 q% c. s% }$ y6 k: }0 { N/ `+ v
to setup-patches( T$ @1 \" r7 Y4 Y
;; initialize the patch-owned variables and color the patches to a base-color
& a3 C* ~2 G) l4 p ask patches
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. j& m W' d$ l! _) { set intersection? false
+ R6 R y% L, Q3 @0 i2 \& d6 N/ r set auto? false
@, g; S+ C/ b4 Q set green-light-up? true
+ W: l& u9 j: |6 w' R" l: b set my-row -14 r8 `! y4 @# l6 N
set my-column -1/ C; m; N1 J& Z3 P
set my-phase -1' R5 D0 p- j* N& M* ~/ B1 e5 ?
set pcolor brown + 3
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/ Y5 C8 L% ^- s2 {3 y1 t ;; initialize the global variables that hold patch agentsets
* d4 d* i7 T7 x$ m. T! `: Q set roads patches with
. s2 m/ [( U( P) k1 a/ a' t [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 h7 P1 B0 m- u* b( c" ]6 G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* l7 D5 O4 j4 j% e' I/ t set intersections roads with
$ ^4 P6 Y6 ~* l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ ]- W G! v! j: U" f4 A/ r! n$ { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% Y5 g. ?9 v2 {5 U% [
) ~6 q" X# |6 z9 B8 m. ] ask roads [ set pcolor white ]) ^! V3 U6 {0 D
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
; Y) d9 K' r3 ^; W set roads patches with" [. u1 I: b# s% m, j1 u) m+ c
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. C, z: K) H( s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% z4 |& S8 q" T+ a7 ?; x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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