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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。
8 r4 Q. [( i" z/ j, M$ V* {6 ynetlogo自带的social science--traffic grid这一例子当中,: Z( z( `3 X4 ?) H/ Y4 C4 Y. X0 c
globals- ]( ]% [# z3 c- r1 x1 a4 Q
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( ~: ^- y# X5 o% c' s grid-x-inc ;; the amount of patches in between two roads in the x direction
8 I8 S: Q- b( `+ M grid-y-inc ;; the amount of patches in between two roads in the y direction
0 O# _& A, \6 u, n- O6 V- ?) C acceleration ;; the constant that controls how much a car speeds up or slows down by if
& [' u% y' d T8 K$ C ;; it is to accelerate or decelerate
8 N9 ^# q5 |; Q- e* z" q. l phase ;; keeps track of the phase: A- ]9 u! J) ?0 r; a8 w
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" W4 B7 J [9 K6 j current-light ;; the currently selected light
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7 \9 F* d4 v- V/ ^$ G! X ;; patch agentsets3 `2 W# X5 y, u7 J! W5 P
intersections ;; agentset containing the patches that are intersections2 P1 S* w( h; n6 w- v1 ?9 h
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
. Z$ v5 S2 I& ?6 A up-car? ;; true if the turtle moves downwards and false if it moves to the right
* q$ ~, I! u. A3 |! {! N% K3 { wait-time ;; the amount of time since the last time a turtle has moved
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6 n0 j) ]9 M9 k- ?/ b8 T# Cpatches-own3 {* p/ N/ u3 v, v9 m
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intersection? ;; true if the patch is at the intersection of two roads4 E9 Z) n2 B7 Y2 `7 X
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ d+ f3 O3 [! r0 P! J# a4 u! Z ;; false for a non-intersection patches.6 x- s0 J% W+ C: T
my-row ;; the row of the intersection counting from the upper left corner of the5 |) a4 ]# B- j$ M. N
;; world. -1 for non-intersection patches.
* R* r8 }8 _( ?& V- \ my-column ;; the column of the intersection counting from the upper left corner of the2 E6 @; z+ x. {( H$ \3 M" B
;; world. -1 for non-intersection patches.
Q) {/ G9 |: } my-phase ;; the phase for the intersection. -1 for non-intersection patches.
# D. }; Q* _# w; Y6 b auto? ;; whether or not this intersection will switch automatically.
6 D- H* x: `& T6 a4 g ;; false for non-intersection patches.# O6 C: I* G9 W' r+ g9 W. J! G
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;;;;;;;;;;;;;;;;;;;;;;1 O+ [9 o; A- X& V, Y4 N8 B2 @
;; Setup Procedures ;;3 ]5 e* R6 q4 C% x1 [
;;;;;;;;;;;;;;;;;;;;;;
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- k2 `) |6 X+ U3 J8 ]4 W;; Initialize the display by giving the global and patch variables initial values.; S. `# {3 z$ o" T% N' l
;; Create num-cars of turtles if there are enough road patches for one turtle to
* g) \+ c7 a4 i* L* E9 p8 A0 A;; be created per road patch. Set up the plots.* s6 B& p# s% ^% Z" B u! d) t; a
to setup
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" @5 e2 D1 Z4 b4 O5 w setup-globals4 m7 A9 w8 i7 X
' {8 Y! o4 a+ ] i5 W% h ;; First we ask the patches to draw themselves and set up a few variables
: H$ O$ h9 d8 |6 Q# b setup-patches; N* _, V/ |- \+ L' t* ^
make-current one-of intersections
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5 w1 D, }( ^: o, a: F3 | set-default-shape turtles "car"
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6 Q6 o' m/ {# I0 F& M if (num-cars > count roads)6 u9 S1 u. j$ G
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5 ?; U( F0 ^3 T- ^ user-message (word "There are too many cars for the amount of "
8 b/ L+ Q o$ y3 `3 K5 Q/ @5 }0 E "road. Either increase the amount of roads "
- K1 L- c) ^0 q' ^3 Z& a" { "by increasing the GRID-SIZE-X or "
7 J2 I% S) k% |+ B* C "GRID-SIZE-Y sliders, or decrease the "
8 g7 n6 Q4 A% `4 a "number of cars by lowering the NUMBER slider.\n"
& V- o) S6 Q# ? y8 t2 ^- A) x" l "The setup has stopped.")
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# z* Z; M# J6 P! G ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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set-car-color
1 N$ T9 C2 e; X5 }7 _' c% V% D record-data/ I$ Z3 F* v4 Y
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( e9 T4 c$ n* P: \' ^ ;; give the turtles an initial speed
0 t- _- W6 K( U! }3 H ask turtles [ set-car-speed ]
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reset-ticks% o- [. R: A9 {+ i+ o9 C: D
end
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;; Initialize the global variables to appropriate values& h( ]: T3 v0 H
to setup-globals
- Q- M7 V: B0 [1 k" S set current-light nobody ;; just for now, since there are no lights yet: k: `) A% P1 M
set phase 09 N3 W0 D, A6 U2 h; m5 [+ Z
set num-cars-stopped 0
0 }- }) d8 M3 K5 O$ ? set grid-x-inc world-width / grid-size-x; N/ o+ L( M1 ?2 c1 ^, V6 ^
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
2 w2 I$ V5 G v' @, j& s set acceleration 0.099
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! H: R# G" A# c: E% V; p' h;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; q. h% f+ F C, C% r. f7 F;; and initialize the traffic lights to one setting
' K$ G- z- h% }& Q# ato setup-patches6 O Z4 a) a' n7 d- S) W' v
;; initialize the patch-owned variables and color the patches to a base-color
8 j6 |7 c4 U+ p$ c ask patches% ]6 _! t8 v' t7 Q; h$ u- ]
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set intersection? false9 |" U$ @" I. I3 a+ r
set auto? false5 w# E$ K ~' D& L/ z& U
set green-light-up? true
, ^8 G% p; I9 B set my-row -1
/ ^* X* J" H, a; X9 E set my-column -1
/ |* G/ C1 M3 q( e2 b* Y1 Q set my-phase -1+ N7 w4 W* `& c; ^/ u- Z$ V
set pcolor brown + 3
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5 p* Y3 M9 @ J$ }* s ;; initialize the global variables that hold patch agentsets
$ y- X. B0 [# w6 r set roads patches with) i% q3 F+ O7 ?; O* U- D. A; n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, V, y, z6 a3 x+ `. R# _ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' m! k/ ^1 ]4 d# n/ e! a# z4 ?: X set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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: l U: z! t( N6 ^: a7 h7 L* P i ask roads [ set pcolor white ]
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end
) R- g( I- O8 Y2 `. ~$ f' \8 D; F7 k其中定义道路的句子,如下所示,是什么意思啊?
0 M9 d3 U) }: ]# ? set roads patches with1 q7 D5 \$ D0 X8 r* B7 z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 M4 H# K0 V _: x6 Y7 M( P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 v) b( f) [& x+ \0 @$ l- _ x3 d
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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