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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$ o8 L& k6 enetlogo自带的social science--traffic grid这一例子当中,; B6 p6 v% f; X. Q1 Y. d. g
globals/ |' p$ |: ^- z
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" k" s( g* w1 z. ?" ^! g$ D+ } grid-x-inc ;; the amount of patches in between two roads in the x direction0 M( I9 y, _ @, j" A6 K
grid-y-inc ;; the amount of patches in between two roads in the y direction# i3 d* n' ~5 W0 I( \8 L2 I! D
acceleration ;; the constant that controls how much a car speeds up or slows down by if; N, U8 m* {7 f/ J: x5 G7 z
;; it is to accelerate or decelerate
& g- t0 W8 L! @$ K phase ;; keeps track of the phase6 g- L ?. @& B" d+ B
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure9 L% d8 L$ a+ v8 Z! h0 d
current-light ;; the currently selected light+ R( t& N0 J8 C. C3 a
( S! \1 _/ Q2 E2 A* P ;; patch agentsets4 A8 [3 p! l0 l( z9 i/ |! c! @6 b
intersections ;; agentset containing the patches that are intersections
) U0 X H0 Y; \; F, V! c y1 G3 R/ L roads ;; agentset containing the patches that are roads
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turtles-own
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3 O$ G' Q H1 n: ^$ B( e speed ;; the speed of the turtle
/ T y( h4 t* H# |9 Z" X0 q2 g up-car? ;; true if the turtle moves downwards and false if it moves to the right
* F: ^. S' I5 I- X% r wait-time ;; the amount of time since the last time a turtle has moved' {4 F6 w* M, P" H; T9 a" s
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& k% W _" ]) _' P, Q( Cpatches-own- e$ A7 Z& m% z% I; l5 ]4 n
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' G, o% A8 g- m6 k intersection? ;; true if the patch is at the intersection of two roads
- C3 X0 G; E& @. I green-light-up? ;; true if the green light is above the intersection. otherwise, false.
, ~$ E7 {( G7 N. X; L4 e ;; false for a non-intersection patches.
7 t* _; N. K/ @ }8 k n my-row ;; the row of the intersection counting from the upper left corner of the
9 A# ~$ m4 x$ o3 @3 U6 G5 L+ h ;; world. -1 for non-intersection patches.
) _. @: I% o, o0 X my-column ;; the column of the intersection counting from the upper left corner of the
2 E* g- T( J6 Q3 d ;; world. -1 for non-intersection patches.4 T: ~! ^/ K, R) A
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
& Q* ~/ E4 W' y& y* P- Y! Z auto? ;; whether or not this intersection will switch automatically.
& `, F* t. c r% G ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
9 q9 e' W' c# g' g/ x; K: `, g; H;; Setup Procedures ;;
& |- b5 M1 s5 M) g* C5 @;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.& h0 O! U5 k* P; a9 u: H2 V
;; Create num-cars of turtles if there are enough road patches for one turtle to
) C' ?7 J" Q* i- ^- V4 y/ G;; be created per road patch. Set up the plots.
0 O3 J& W& {. Q X$ ]to setup
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^1 |; s& x0 p3 h# [# h setup-globals
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" F, F6 Z H6 g& ~ ;; First we ask the patches to draw themselves and set up a few variables! a3 u* b4 _8 n( j: j8 `; i
setup-patches# C- y; `8 x; [- \
make-current one-of intersections
* T$ E! B5 r1 ?3 v2 y% N label-current
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]6 w8 A# x& ] set-default-shape turtles "car"
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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 "
$ V+ p0 @7 ?; y ?8 R/ ` "road. Either increase the amount of roads ": x6 Y, @& o5 I, D r8 n: _' D0 J
"by increasing the GRID-SIZE-X or "5 K |! m; C1 l6 v) }: m# s
"GRID-SIZE-Y sliders, or decrease the "3 G J$ j. L/ q) a6 n
"number of cars by lowering the NUMBER slider.\n"
+ B6 z4 p4 X$ }) r9 n" N% j3 P "The setup has stopped.")
/ L/ R: ~. ]7 P# T, V/ u" |4 ` stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 j/ k3 @9 f5 @, I4 p
crt num-cars7 k' \! t% ?& y/ O/ x& L& S: C1 N
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setup-cars
) S: h, w& |% e4 @ set-car-color+ Z+ Y3 X7 F7 V; q$ Q
record-data0 V/ H0 J# O! M! Y1 E% t! ]: W0 _
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;; give the turtles an initial speed
4 L9 v8 d$ G6 R2 T1 P) \& B/ y ask turtles [ set-car-speed ]7 V- q$ a$ ]7 ^- f; v& X& d- H
& x) Z8 G) @6 k5 a% z reset-ticks
5 z L% { l3 _end
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;; Initialize the global variables to appropriate values
( C, G1 A* }, G" p* w. Qto setup-globals, N* i: j: k; O/ N2 ]
set current-light nobody ;; just for now, since there are no lights yet
/ d6 W7 b9 f+ L1 X, Z9 w. A( R set phase 0: [; m8 A, u5 z6 K1 s& R; a# o& Z
set num-cars-stopped 0
5 i/ v, S# f, V- y set grid-x-inc world-width / grid-size-x
( w4 u% k+ }4 i8 J8 _6 t set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: M2 X: i6 h% `/ X) {
set acceleration 0.099" n u' y5 Y1 u# m/ C$ R% X9 z
end& Y6 F6 c. P& R' Q
! \7 ^ U2 d' S+ s& t' ^;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 r8 s; Q' q" ^7 Y;; and initialize the traffic lights to one setting
5 u- y& {) M9 C0 Rto setup-patches
! H# U4 `' F" ~& p ;; initialize the patch-owned variables and color the patches to a base-color' a2 e2 g4 P% b$ `5 u0 D0 u
ask patches
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set intersection? false, D6 o+ @7 D( w+ W
set auto? false
, f% C4 [/ s+ L, E set green-light-up? true! t: H. l7 r8 S9 V
set my-row -1$ h/ O' \" [. ~5 U/ Z
set my-column -11 |. e9 I& s: X
set my-phase -1- p* D$ z6 @! b+ T
set pcolor brown + 39 q8 s. t2 L0 [
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;; initialize the global variables that hold patch agentsets, O+ j8 J: V- A4 B( a% d9 }
set roads patches with
+ q' y% ]5 l& y/ U% l8 T0 E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 @3 X+ Y- m& J( \+ Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( p! M+ D( j4 V! L/ S
set intersections roads with/ W2 l# A3 H0 O& [4 C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" D2 z1 h) F: V8 J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end8 m1 b- [" g; ^) Z" G! v
其中定义道路的句子,如下所示,是什么意思啊?2 h7 [$ d* ?( r; j4 {
set roads patches with
0 ^* b1 s3 H4 z& U6 Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 S' ~- w) ^: a0 H/ Y* m) F- O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 {( v6 z+ Q( e
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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