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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。
1 S0 e% K2 S3 ?; Enetlogo自带的social science--traffic grid这一例子当中,
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grid-x-inc ;; the amount of patches in between two roads in the x direction
! L. Z; v1 U3 q6 Z6 L1 P grid-y-inc ;; the amount of patches in between two roads in the y direction
: D( T, _8 R( } acceleration ;; the constant that controls how much a car speeds up or slows down by if
+ |; }) z n. J* {/ c6 u/ K$ j$ z ;; it is to accelerate or decelerate" c% A5 L2 p! x) Z C; n7 ~
phase ;; keeps track of the phase
5 ^( x8 m' A$ X! x O num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure) A" j. q H+ D! @$ D
current-light ;; the currently selected light
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;; patch agentsets
/ ?' [/ i% y! S K& z9 i* {7 P intersections ;; agentset containing the patches that are intersections
$ @' b% f, [' {# H roads ;; agentset containing the patches that are roads T; R7 {3 Z9 q* A6 h( A P8 N9 [
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turtles-own
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speed ;; the speed of the turtle
$ n y' Z" }" B+ V- k up-car? ;; true if the turtle moves downwards and false if it moves to the right" M* D8 N* h" B5 O
wait-time ;; the amount of time since the last time a turtle has moved% u% g) i8 a4 v& j3 G
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patches-own8 V: h) C: E9 z7 m! d" \* r, i
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# W2 U% z! t3 n# r' w intersection? ;; true if the patch is at the intersection of two roads- h5 w9 \2 z* x
green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 H. ~: I: U, O$ H
;; false for a non-intersection patches.# ^- Z7 I0 Q/ p- r9 X& ?, V
my-row ;; the row of the intersection counting from the upper left corner of the
6 f$ @7 ?1 n6 E+ p) l ;; world. -1 for non-intersection patches.
4 I" b) k- D( z/ F my-column ;; the column of the intersection counting from the upper left corner of the; _+ p7 E% P4 U$ J, z4 C
;; world. -1 for non-intersection patches.
* d; o3 Y. d- N' T1 H8 L0 M my-phase ;; the phase for the intersection. -1 for non-intersection patches.
l+ j! B( i& h& O+ F8 d4 t auto? ;; whether or not this intersection will switch automatically.
. W0 q( X1 A+ C1 f# y ;; false for non-intersection patches.) W4 w8 f; O: `6 Y3 A7 o" ~
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;;;;;;;;;;;;;;;;;;;;;;
1 [: U% U3 ?2 c, [0 D;; Setup Procedures ;;
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. I6 `. T- } j7 `; e" s;; Initialize the display by giving the global and patch variables initial values.
0 [ T N$ S- d4 h0 ?3 T0 J;; Create num-cars of turtles if there are enough road patches for one turtle to/ {* i, P, E5 [0 \; Q$ P
;; be created per road patch. Set up the plots.$ T0 w) D1 ^( f
to setup& c+ C2 U% t% m$ N# {. x' ]$ n
ca
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( u3 {8 I5 ?& f9 w( @! m ;; First we ask the patches to draw themselves and set up a few variables
; z$ C; S, ] ?" U! P2 H setup-patches
6 `( V* o! r C" I% ] make-current one-of intersections& z. C# X# @8 _' c; R- i
label-current
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set-default-shape turtles "car"% q2 o3 \2 i0 [; C& Z
" I. K9 b( C- o" U if (num-cars > count roads)1 g* ]. u# E! s" k% O. Y
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user-message (word "There are too many cars for the amount of "' E9 o, P/ h' |" n. U: E4 Y7 R
"road. Either increase the amount of roads "! m; W! N5 @' e9 E
"by increasing the GRID-SIZE-X or "
$ o k( g; k. C "GRID-SIZE-Y sliders, or decrease the ") Z/ c! T, @! q0 L
"number of cars by lowering the NUMBER slider.\n"& y- c! G& y! ~, c8 M7 Q
"The setup has stopped.")3 v% k# @4 r' e# x+ Q6 u
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color# L7 Z5 |/ Z/ T+ V) I
crt num-cars
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setup-cars
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n2 ^) g3 O' h4 G2 f( b8 q record-data" Q1 S& _; I: ~; {" m, z1 g
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( E8 y! D7 `' C2 S& w8 ^1 o ;; give the turtles an initial speed$ L$ v$ E* F) Y. D6 c
ask turtles [ set-car-speed ]9 Y( V5 m# ]: @0 Y0 `& @
3 V# m* K1 L" N+ Y+ L reset-ticks
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% P' y2 B6 P8 P& Z;; Initialize the global variables to appropriate values
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9 B8 ^% e* N" a* R+ d. G- r set current-light nobody ;; just for now, since there are no lights yet# O0 h5 Y7 S; g' R
set phase 07 M; G% a# Q* D
set num-cars-stopped 0! y W( F4 N* y5 O; a* q
set grid-x-inc world-width / grid-size-x
4 Y0 j" |' Y( c/ h. x( h) ~ set grid-y-inc world-height / grid-size-y' C1 ~! Y9 b0 W* `4 A5 `
8 t! b; p9 C! ~; @ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
W7 ]1 w3 f x! N set acceleration 0.099
7 t. s) s, B% F. Uend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
J3 N; ], ~5 ?" m;; and initialize the traffic lights to one setting2 ~5 |3 J6 Q% }7 P6 ^
to setup-patches @5 @# w; s- j1 x4 q6 p: a
;; initialize the patch-owned variables and color the patches to a base-color
% D5 l5 l6 I- h& X' m- m) r( Q ask patches; m7 f& t8 B; i3 x, p* |# t
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set intersection? false& q4 ~2 ^0 P# I) S. r' h
set auto? false
. \( z2 A# b: n# I$ ^ set green-light-up? true
6 J1 `1 K; Q4 x: g1 j- W set my-row -1: j6 R0 `5 {1 y, x/ G" d
set my-column -1
0 k6 s j1 W0 {" E" _ set my-phase -14 d7 d; ^) }9 a E
set pcolor brown + 32 R$ T8 ? @5 { W% G( S; C
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;; initialize the global variables that hold patch agentsets
& V: {6 r# d6 _, h. b set roads patches with' s% W! s" l# r8 V. i6 A2 d
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- l6 _1 [# q1 u+ u5 M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) M7 m, Q3 }, f' b4 u; P
set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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8 w$ Z$ Z Z5 C {其中定义道路的句子,如下所示,是什么意思啊?/ s& y0 z# d" C; V( J/ a! v
set roads patches with
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& }5 ]! ^' b- g3 H8 a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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