|
|
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 N0 I8 k5 o S0 ?$ L4 l; anetlogo自带的social science--traffic grid这一例子当中,# |2 ~7 F7 f& B5 O5 j
globals, Q0 [) X1 a/ }. }3 M) e
[
( Z( M( G2 p# F" d( E7 a7 F$ q grid-x-inc ;; the amount of patches in between two roads in the x direction# B+ P; D: G2 g# {; C
grid-y-inc ;; the amount of patches in between two roads in the y direction" x: \3 v2 L. ?
acceleration ;; the constant that controls how much a car speeds up or slows down by if
- ~' p Z; j9 K; M* j5 a ;; it is to accelerate or decelerate5 ?7 z7 _' T2 ~( i! j6 X
phase ;; keeps track of the phase2 g3 S- T* i! h; t8 X; B
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure: O" p% [* z* H& E: d1 p
current-light ;; the currently selected light
) n1 N d: p. ~+ G1 K% G
2 a* t9 O' r: P+ t' ^, ~8 ?( I+ Z- h ;; patch agentsets
/ k. _/ Z+ h& d+ S intersections ;; agentset containing the patches that are intersections
[0 H. h8 j. _& B* [( j. ?, | roads ;; agentset containing the patches that are roads
" J$ B: g, l0 z]
/ i& e- L, e% g2 S j) Y( T
- g6 A* C& O6 O0 \% Zturtles-own4 p1 N/ \: u! s6 U
[
& x7 I0 l: e' @6 u$ b; x speed ;; the speed of the turtle
* W6 f. T& H8 D* ^& G: e- Y8 X up-car? ;; true if the turtle moves downwards and false if it moves to the right4 b8 N* G) h# D- d. u' ^0 F- v% N1 O1 u
wait-time ;; the amount of time since the last time a turtle has moved
' t, C: z) O, `4 V* r4 e]
' c, R* M. K- _: m7 H/ H3 D4 g8 i) ~+ [0 a/ ]& O& p, \3 \
patches-own2 W3 Q0 o9 X# X0 O0 @9 {) H
[
" G& R, q9 G9 y$ F. y4 T2 Y) m intersection? ;; true if the patch is at the intersection of two roads- Y/ X+ k# q5 N- W
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
! d" C6 o/ h2 y# L# @ ;; false for a non-intersection patches.7 j& u2 S, [8 o4 n4 h6 O* \
my-row ;; the row of the intersection counting from the upper left corner of the
% E0 ^' s% \9 ~+ X ;; world. -1 for non-intersection patches.
# b3 ~9 g; o8 Q. N, c my-column ;; the column of the intersection counting from the upper left corner of the' z% l" F8 b/ w1 t3 A
;; world. -1 for non-intersection patches.
~8 c+ y; G7 ?( G my-phase ;; the phase for the intersection. -1 for non-intersection patches.
; N) g# r5 `2 v/ r8 Q! F& L) W auto? ;; whether or not this intersection will switch automatically.& M9 r- w w7 a8 k7 X% K9 |
;; false for non-intersection patches.0 f9 o' t& E. G$ \! J) X% v
]
' c6 o$ m5 k e S; Z% P! e1 L( n; K. O7 W
% f2 w/ H( `6 [" M" q" ?! c7 R;;;;;;;;;;;;;;;;;;;;;;
' m/ }( X% S: M2 I" t;; Setup Procedures ;;
+ M7 a) P5 C' H;;;;;;;;;;;;;;;;;;;;;;' J9 ?' l5 _$ M+ S
9 {# b0 O: e" A/ ~- u2 z
;; Initialize the display by giving the global and patch variables initial values.9 F: r0 X4 r' |. I# [
;; Create num-cars of turtles if there are enough road patches for one turtle to1 ]. x) P5 F. u, n, s5 F
;; be created per road patch. Set up the plots.- S l7 r: a3 g0 E0 J7 e
to setup0 y" E4 q8 G5 C
ca2 N$ t- C u9 f# ^2 A. i3 j9 C
setup-globals
; `) B6 D& |1 K* P4 _5 q
) [$ k. Q& ~$ C ;; First we ask the patches to draw themselves and set up a few variables
# }: }+ d/ } U& I setup-patches
, ^) `6 e' E# ^: n make-current one-of intersections
' q5 ^; l: D" x8 b4 v label-current
( y9 ^. q' z; N8 [
9 _. P7 A2 ]. s- i2 Y' X$ j set-default-shape turtles "car"
% M6 P& l1 b" {: n; t6 [- k9 T6 x* u4 F4 l3 g- ~0 r
if (num-cars > count roads)$ E3 _( ?# K/ j1 u# @
[
9 [' B. A: W) \8 E% `1 C! w5 k user-message (word "There are too many cars for the amount of "
' u7 m: e. t6 a "road. Either increase the amount of roads ": [4 i1 W2 p. ~$ e/ e
"by increasing the GRID-SIZE-X or "/ H' v7 h$ f* w* q# H6 {1 }
"GRID-SIZE-Y sliders, or decrease the "
5 k2 W7 l- x# l9 u. \ "number of cars by lowering the NUMBER slider.\n"
1 N- W! F/ p7 s" U4 s: _ "The setup has stopped.")
2 `- |% M5 D1 g+ Q stop
% D& z9 I* P# m/ ] O# F/ N ]
8 e3 w1 u. V$ t& l
/ \" ]. T) v& |! b& _! t; a: u b ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ K. c8 Z. L _/ y
crt num-cars1 T* ?4 V% Y/ q6 K9 j
[
* g. a, [3 M& R9 z: S7 w setup-cars4 ~4 c) g' o2 Q5 F4 T
set-car-color Z( _; \8 X# N0 t4 c6 b- c7 n; x
record-data
* F5 t' L$ y, ]5 n& [( v3 Y) Z ]
" k' t1 Z" L& v! }8 z$ n3 k. ^$ l. a
4 e! |8 P) w3 ]& V ;; give the turtles an initial speed1 M- ^& b. ]8 O7 {. N) x
ask turtles [ set-car-speed ]
/ B5 N. W+ k5 U3 a9 }) T$ Q& z0 z& F6 c) a
reset-ticks
% ~- W6 ?/ F# g0 `end
9 h/ j9 u; g( \& L6 d$ ]
4 V5 V% G0 M: _9 d$ t;; Initialize the global variables to appropriate values, J7 u1 N5 K* P5 i
to setup-globals# {7 N. z0 l+ p1 j" I
set current-light nobody ;; just for now, since there are no lights yet
- \, r" ^7 J$ l9 q p( }/ i set phase 0
" S+ V8 I5 h2 I, O: z( n/ y: ]1 v set num-cars-stopped 0
" k) M! q" Q: W; B6 x+ [9 t7 G# Y set grid-x-inc world-width / grid-size-x2 I" l* g9 Z4 Z. f1 P; U
set grid-y-inc world-height / grid-size-y3 l4 N3 q: ~* t
. _ Y3 L% M+ o3 ? ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ s) @! O' U: K' ^# ?3 o
set acceleration 0.099
, c+ W+ Z4 k1 }8 s! _3 W! eend
5 s( l) i8 ?5 R/ i2 k6 r" F1 [% M2 i$ @; @
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; d- B: p! s) ^;; and initialize the traffic lights to one setting
2 I: ?! u( u% a( M7 Zto setup-patches- o7 x0 R3 x$ M/ B9 s4 e3 h
;; initialize the patch-owned variables and color the patches to a base-color
9 A2 e1 a# Y. P5 f/ _/ T, H5 E& d ask patches
+ ~8 S6 q, v4 f% S [# P! g* M1 @/ v2 \3 q! D
set intersection? false h) o1 y% y: }, O( r- J
set auto? false
- o; g4 y8 a+ m; r* { set green-light-up? true
' q9 O! X% y6 _ set my-row -1$ i2 U, b2 ^, G0 q/ I
set my-column -1
% m8 T) I9 o7 L set my-phase -1! ^7 ~8 P8 [3 r7 J7 S+ k$ _# M
set pcolor brown + 3
, t. }) _; r/ b) u; h ]
/ ~1 m) |3 P; l2 R
( i5 p( |% F, g( M/ s, c8 n9 m ;; initialize the global variables that hold patch agentsets
- V6 {# w* W2 P$ a set roads patches with
2 s# @* C! L. o/ K$ b4 d3 ]9 Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 x7 m& q j8 A& [% O" k, {
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 i' n$ b" }. a' L* S: g( P" p
set intersections roads with+ ^) L9 i) I6 t8 q& V/ b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; }* c3 K8 b5 d; p5 H( s$ e+ i+ w/ {
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 q0 |% M6 _3 [0 A
/ D/ W/ R8 N% e/ h, b% y
ask roads [ set pcolor white ]! A- G! C0 J) f
setup-intersections
x& m2 L4 V6 u/ ]4 Z( Cend
9 T& o, q- H- g: H% c其中定义道路的句子,如下所示,是什么意思啊?* w& ~+ C3 v8 W+ Q$ f
set roads patches with
% Y* _* ]% |3 j2 Y( S+ L; o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 @- @1 _ t* c0 n7 k6 b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 m2 J( ^- M. t1 Z: b( X
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? |
|