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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。( |* [$ { a: ~ i# v
netlogo自带的social science--traffic grid这一例子当中,7 ]! o! \: L+ g5 p
globals5 x( a/ J0 q1 V+ U6 [6 o
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grid-x-inc ;; the amount of patches in between two roads in the x direction8 h( N3 k% u. L& i2 ?" @' n! X
grid-y-inc ;; the amount of patches in between two roads in the y direction6 S4 {0 T0 R" q3 s; z# i
acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 m5 @$ ?5 r2 } ;; it is to accelerate or decelerate
# [6 P8 M7 M L( V _ phase ;; keeps track of the phase+ s7 o% _7 [- m
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
O/ v! J5 N* G2 P$ s& V7 ] current-light ;; the currently selected light/ ^. v( e" W4 C6 c" y5 d
5 c- ?3 M% |9 A. W ;; patch agentsets
0 b2 X1 J1 t) t9 J& `% x intersections ;; agentset containing the patches that are intersections! c- O$ y% g/ e8 K
roads ;; agentset containing the patches that are roads* o4 Q* y* m6 e7 ?4 O+ x4 g: c/ \
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! o: L" A3 J8 `% N7 f( v$ e* J4 \! vturtles-own6 H# c- H! H4 h% V2 s9 d
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speed ;; the speed of the turtle
* P5 i+ B2 ?* x `; s6 l up-car? ;; true if the turtle moves downwards and false if it moves to the right: H1 }; i# K7 w6 \% ^4 C& i
wait-time ;; the amount of time since the last time a turtle has moved' N% k& r% k# s- c9 f; O+ |/ c, E
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: Q. G% g! r. [6 H6 a, [patches-own
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7 ?& {* r6 A& m# m7 y# e% w intersection? ;; true if the patch is at the intersection of two roads
; T$ }. E3 z/ M y7 w green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ q( n% x( q8 }. Q" u \ ;; false for a non-intersection patches.
2 b8 ?; D& `# `0 F my-row ;; the row of the intersection counting from the upper left corner of the4 X% }" r& V# O* n; O+ ]" w
;; world. -1 for non-intersection patches.
8 u. A0 i$ K, g6 E' ]8 \ my-column ;; the column of the intersection counting from the upper left corner of the3 R7 G" z s$ v4 d0 |3 m
;; world. -1 for non-intersection patches.
7 p+ \7 B" W; D0 E% g my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) }; S9 B1 ?: A+ F auto? ;; whether or not this intersection will switch automatically.
_9 h1 { B6 d% o/ O ;; false for non-intersection patches.- D+ {) _' p2 O
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;;;;;;;;;;;;;;;;;;;;;;
5 v* ^/ e% m/ w j8 g4 ?;; Setup Procedures ;;
& ?3 i2 @2 L4 u( I;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
# P/ r, u" {6 f6 Z6 L2 E, g;; Create num-cars of turtles if there are enough road patches for one turtle to
/ ^6 ^: Q1 |& [( F3 U' e;; be created per road patch. Set up the plots., V2 ?+ G) [! V8 c# m% L
to setup
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setup-globals, J- H% `5 h: P; `# N2 K- ~
5 P; T1 l X) l3 m0 ]! e m ;; First we ask the patches to draw themselves and set up a few variables x+ T$ i$ Y Z8 p7 l- c1 _
setup-patches1 \/ A% p; v- f8 ~" X! e
make-current one-of intersections
' c( e* k' Z6 |5 x- m" i! z label-current6 D8 ?3 X+ y! F9 |* k0 k4 j- D
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set-default-shape turtles "car"
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, g! b' B& W$ P3 r if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
- R# d5 v9 l- d; x "road. Either increase the amount of roads "
* V$ W! Z. S9 ]8 a6 ^; N* H: Y$ W( J "by increasing the GRID-SIZE-X or "
& Y" ?9 m! G; C; z% u "GRID-SIZE-Y sliders, or decrease the "3 e6 N; j& @/ i6 f: v$ r4 m; o
"number of cars by lowering the NUMBER slider.\n"1 ]- D2 l5 [$ }! h; ]7 R" v' y' h
"The setup has stopped.")' W7 }/ Z* v% o5 |
stop: g; q5 s2 ]6 t: M9 k
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- y+ ]7 s# d4 w( \1 Q crt num-cars
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( l. g3 s8 A/ [2 T; I( ?+ K3 h setup-cars
: |# _& D/ b) w7 t( j6 ]- ] set-car-color
5 G+ i5 M/ h Y* g record-data. p+ T$ X: ]( z/ S8 V5 X! F4 v: L4 c
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7 _; q* {( }6 g9 G+ Z X ;; give the turtles an initial speed; m7 {! |. p8 n( _: b& W
ask turtles [ set-car-speed ]4 _3 j9 i9 Z" }" _! f3 `1 u6 f" O
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reset-ticks
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;; Initialize the global variables to appropriate values
6 x) p1 e7 q. ?" O. z# @to setup-globals9 X0 Q3 ?& F3 c4 W
set current-light nobody ;; just for now, since there are no lights yet y& f) e6 \- p" c' I; Z8 {, X
set phase 0
7 @4 S/ C+ B' H, ^2 j0 y# { set num-cars-stopped 0, M5 ~! G7 [4 `# {: o' B& E
set grid-x-inc world-width / grid-size-x
9 ?. M: S$ H: I6 } set grid-y-inc world-height / grid-size-y
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9 L" R: z. u- |# f, d ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ T& _# l/ r5 S- l0 {
set acceleration 0.0992 W; W2 h+ z# y( G6 G2 j% W
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% a* W& j7 g7 W/ @3 C x8 i
;; and initialize the traffic lights to one setting0 I% t5 L% ~- n* y
to setup-patches1 a2 Z6 U7 ]# X6 Z9 E% r
;; initialize the patch-owned variables and color the patches to a base-color
$ g. d P& o3 l# g ask patches
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set intersection? false
4 q) Z# f% }+ f( H& F: a set auto? false
2 i: [. C) l# Q" v: B. X# W. H! g set green-light-up? true. @' j+ j& N, U& l
set my-row -1' Q0 Y% v2 Q) U- |, J6 O
set my-column -1
+ l j n* m2 g: f1 j5 u0 ` set my-phase -1
) p. o8 `$ N" B0 B6 F2 h set pcolor brown + 3; S# R% G5 i5 ^6 {
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! \4 T) r5 J' h9 Z" F4 ^* U ;; initialize the global variables that hold patch agentsets
0 V0 N; p8 X: W set roads patches with* q* L l F" ?4 x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 S N$ a2 s2 k" k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) q; n+ a' i* K( p
set intersections roads with
" I" |1 ?0 e! X5 D2 S [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 q/ y2 z* c3 p, Q5 Y) P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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7 R7 X5 x) P( ^5 w ask roads [ set pcolor white ]/ T3 M* O3 |8 h) K
setup-intersections0 A# A2 f2 n, Y9 y- V1 T
end
6 |5 J$ U: |$ j8 |% K% R9 o; h其中定义道路的句子,如下所示,是什么意思啊?2 G/ R/ u1 V% K+ f
set roads patches with, z, {! R; u. z* F6 c( ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 a& \ S/ w, H& n$ s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 Y( S: J5 L/ l8 I) J7 f9 C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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