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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。 q, L* {2 g% m; h8 O
netlogo自带的social science--traffic grid这一例子当中,) v$ f5 { D3 u8 O
globals5 |" e" Y0 ] j3 Z ^2 A2 N
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9 r e- \ |! `+ I7 b: N grid-x-inc ;; the amount of patches in between two roads in the x direction
) s1 s4 i) ^3 }! A1 ] grid-y-inc ;; the amount of patches in between two roads in the y direction$ q- J8 d* A+ ?- b# j. r
acceleration ;; the constant that controls how much a car speeds up or slows down by if+ T8 ^- C# O7 c) N! X; n
;; it is to accelerate or decelerate
1 U8 q K% p; t: A* N phase ;; keeps track of the phase
' g8 [: {" K* i& ]2 j& ^ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( ]7 \ ~) @/ [, V: R. T
current-light ;; the currently selected light" t1 k. T" f; s) I1 C, b( T5 K
4 `; y6 H6 ?. Q G! n ;; patch agentsets
0 ~- P3 ]" _0 q, G3 l: ^- u0 A intersections ;; agentset containing the patches that are intersections
& y0 j: X, N' n6 P3 P" F# b roads ;; agentset containing the patches that are roads* L0 J8 `7 N) W: H8 K
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0 J: Q7 ^0 S P( G5 O. Wturtles-own! }( A; y, ]9 E1 G" D+ d7 E7 K
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3 i: l% _, u- a6 g* u m3 S. Y speed ;; the speed of the turtle# b3 t t7 H( s* w( N/ i" f
up-car? ;; true if the turtle moves downwards and false if it moves to the right& X6 U f; ^- Z8 B+ {( t4 X* x
wait-time ;; the amount of time since the last time a turtle has moved+ x- y, J. }9 O$ P2 \3 P
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& h6 J( j. H1 B* x+ F3 s! ^# bpatches-own- j4 S8 g2 Z' {+ n6 {/ M* q
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: o# x6 Z& q2 ?/ g [% t$ T intersection? ;; true if the patch is at the intersection of two roads- ^5 Y3 f# A& b% |8 e. |$ p# T' `* ~% s5 c
green-light-up? ;; true if the green light is above the intersection. otherwise, false.( U9 L* a6 W( z% \
;; false for a non-intersection patches.
8 Q, W% i& P% b$ ^# O2 ~ my-row ;; the row of the intersection counting from the upper left corner of the
/ |, b* W, T! l. F: k1 t5 ?& ] ;; world. -1 for non-intersection patches.
4 ]! n* q9 M% Y% S! w. b! \$ o my-column ;; the column of the intersection counting from the upper left corner of the8 J- W5 \7 b' L6 E1 U2 A
;; world. -1 for non-intersection patches.
( ]0 z; d- V* ? my-phase ;; the phase for the intersection. -1 for non-intersection patches.
$ e8 w4 |9 f/ Z8 y3 q# h% D, g) C auto? ;; whether or not this intersection will switch automatically.% `1 r L4 A; B# v
;; false for non-intersection patches.; ~& c G3 T/ {2 P$ x
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0 P$ J- _6 S9 C- N* T4 M/ Q;;;;;;;;;;;;;;;;;;;;;;
. X. R8 L5 m7 _& ~) h;; Setup Procedures ;;
% |3 @5 Y' Q$ \% s1 M;;;;;;;;;;;;;;;;;;;;;;
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' H p0 \8 y6 k2 `8 \: H* f;; Initialize the display by giving the global and patch variables initial values.% G/ a+ w0 d7 L/ v6 u( t1 b( o
;; Create num-cars of turtles if there are enough road patches for one turtle to
* C! v e- n: c! Z/ m' A0 A;; be created per road patch. Set up the plots.
7 D) \' M$ [3 N9 E- sto setup
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9 [( e1 R8 K/ o; K% K) \% l setup-globals
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;; First we ask the patches to draw themselves and set up a few variables; Q) w- t) B5 U( x6 _' A. G7 d
setup-patches1 O# _0 a( R: U: W& Z
make-current one-of intersections
: x6 W/ X# }$ l$ @% j# `$ c ~5 i4 T label-current: ]# Q& \( j2 G7 f4 n
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set-default-shape turtles "car") U- h1 T" h; ^% Z; ~& d8 s
: h! j/ K6 b6 B9 u6 e if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
) d6 Z& n% C5 F( V' x1 M6 o "road. Either increase the amount of roads "4 c$ y: H7 j4 L+ X" ~/ X
"by increasing the GRID-SIZE-X or "
& V, t _! j4 h# ^& V9 @ "GRID-SIZE-Y sliders, or decrease the "8 z. f; `5 n5 E* x0 a. Z
"number of cars by lowering the NUMBER slider.\n"
! z" s$ \9 `5 {" W5 C "The setup has stopped.")* x: I9 u* }! g" P
stop! o3 a! R; P1 \' Q* X4 F; d
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2 b' q3 z7 B& V: x ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 L1 m- ?& A, M4 r+ ]4 u& i7 |
crt num-cars
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& z% K5 C I& \! ^ setup-cars% y4 p( ?6 F* N5 T1 A
set-car-color
" x0 \4 M/ P. Q2 d record-data [/ w. o3 n Z; { U( v" |" [3 R
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;; give the turtles an initial speed
7 c6 n1 R1 L/ b" v/ j ask turtles [ set-car-speed ]
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, B1 m% L1 a$ _$ e& y reset-ticks
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3 B* z4 s, P# D, G9 ~! ?;; Initialize the global variables to appropriate values
# w2 y8 f* k/ |' f( R+ O. H. D* d3 eto setup-globals
; F( \# u& R' q' g set current-light nobody ;; just for now, since there are no lights yet
" } G/ L! l1 ]& r, G+ \' d' ^" ] set phase 0; h- _0 z0 v# S
set num-cars-stopped 0
9 M+ t4 k% l# @! Q8 g set grid-x-inc world-width / grid-size-x
1 g! j* I, Q, q; v1 T* V set grid-y-inc world-height / grid-size-y4 ^ A9 f$ z# w7 q
. a9 `) E- H2 B7 w7 ]) h& e ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: R; Q! x' K& S% A; \$ x! y
set acceleration 0.099
3 \1 R0 x. j1 A0 V& a: Nend/ f; R" c/ t- g: f. s
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ R# o8 m0 M1 p# W8 u6 [
;; and initialize the traffic lights to one setting
7 P, z" e& G& g) o8 A: P, w/ ]9 q! dto setup-patches3 ]' @7 v3 {% p) x4 |% v
;; initialize the patch-owned variables and color the patches to a base-color# n; K7 i7 Q& p2 e9 |/ a" m
ask patches
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set intersection? false! }* _+ c* n) @( F" G$ }3 Q/ Y, B( c
set auto? false. T/ a; L- Z6 p& A2 o+ A& D1 q
set green-light-up? true
* P7 R u. n8 r6 p7 q set my-row -1& \+ q+ ?& Y" T( A! X( ?( K
set my-column -1; e5 ?; E5 Y3 |: L- [
set my-phase -1
4 n( T f- l {- z; ^ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets3 Y) N6 q4 j4 R
set roads patches with: ]" ^. C+ P) S# O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ U/ b, P2 v% `# I7 h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& ]0 e3 }/ s5 t( m% I: |
set intersections roads with
" R2 E; |5 z2 J: r! F [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& V: |$ W* P, ?% H# Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' z* ~6 Q9 a& |' a! J
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ask roads [ set pcolor white ]% x' O7 i( N8 O8 {+ i; n. T
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?
9 Y- w( L$ Z0 R/ O \0 k: x set roads patches with
* z: r6 C @! N [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# v( F: n) K0 Z' R$ C (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 i: U5 d" z( T3 J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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