|
|
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。+ ^, F" r% F3 k1 C3 V$ I4 f5 M$ @$ Y
netlogo自带的social science--traffic grid这一例子当中,
9 K- t. d& i% [& }globals
5 {0 m w4 i2 K[& q0 F# m. |" M0 m2 N0 i, O
grid-x-inc ;; the amount of patches in between two roads in the x direction
- p# N2 C w0 a# s grid-y-inc ;; the amount of patches in between two roads in the y direction
7 k9 Q9 Q: H& W5 S acceleration ;; the constant that controls how much a car speeds up or slows down by if
" ]: [/ b/ T9 e% g" _% U; Z5 B ;; it is to accelerate or decelerate( a! P" A" C4 g3 {3 L% s
phase ;; keeps track of the phase
& s# ~% q0 }* Y. n o2 J num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) g3 j$ C6 p$ `! ^6 b current-light ;; the currently selected light
& G; L) x {2 n' C! Q; H8 N; S8 s1 q6 C, l/ d b; R
;; patch agentsets; S7 Y- [1 N2 D# |. ^4 r. Z
intersections ;; agentset containing the patches that are intersections' Y- U' d7 F6 n, j! R
roads ;; agentset containing the patches that are roads; ?3 K% k( r- j: T. l& _
]
: G9 R7 |' g, ]" |6 F& l( k. r; W# B3 w5 `& R( d$ k
turtles-own; ?# t+ W7 ^7 _% l/ J2 W) [9 F+ |
[8 a% }% N$ e. _0 [
speed ;; the speed of the turtle
$ Y" B2 l6 ?4 y% T% n- ` up-car? ;; true if the turtle moves downwards and false if it moves to the right
4 ~% U1 H3 W# O( H2 J% s wait-time ;; the amount of time since the last time a turtle has moved
( P" p9 O' T* H/ m! Z]
4 C- S& R8 K2 X; s) W
: |; j$ i3 G; E2 p7 ]! Kpatches-own
, P1 l( M% g( ~7 i+ I[0 w. P* z H' [( ]3 l+ z
intersection? ;; true if the patch is at the intersection of two roads9 _' t1 w3 B1 @9 r8 N d
green-light-up? ;; true if the green light is above the intersection. otherwise, false.) X8 c: I- {, V+ Y0 S3 M% Z
;; false for a non-intersection patches.; p4 H% f2 D9 x
my-row ;; the row of the intersection counting from the upper left corner of the4 ]% ^6 W2 k% ]; e" j) |# Q
;; world. -1 for non-intersection patches.
) {+ M9 c. e0 p/ Q6 ~! J my-column ;; the column of the intersection counting from the upper left corner of the. [* p4 g3 F+ ?1 I; z8 w# v1 c
;; world. -1 for non-intersection patches.3 j) t8 j0 g5 U0 K6 R
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
/ M" L" T3 b! H; @ auto? ;; whether or not this intersection will switch automatically.3 C( B2 v: R/ ^
;; false for non-intersection patches.' `) W; S, B! m" X) _
]
9 S+ E( h7 d, I5 s0 b+ q1 D+ ~* ]
. w* M/ t% I0 b9 o8 A
4 y s: z" F1 u! D6 X: m;;;;;;;;;;;;;;;;;;;;;;6 X/ w# A1 Y: x1 K5 _ V
;; Setup Procedures ;;
2 ^+ d, u5 m; X8 X, m8 C;;;;;;;;;;;;;;;;;;;;;;
% X# O) C7 v9 j
" s" V: K+ h9 y; |;; Initialize the display by giving the global and patch variables initial values.
/ W- i! W6 ~4 j$ _& _! G0 z;; Create num-cars of turtles if there are enough road patches for one turtle to, x% j$ e+ a% {! ^3 B
;; be created per road patch. Set up the plots.. B! j) X: h) d) W) M6 K
to setup
1 _- c* n& l2 O5 n& b1 I ca Q5 c% g* F* j9 I; P
setup-globals/ s- S: }+ Z+ t4 r9 z* C1 N# M' @5 `
- z! r; p. z! b7 h4 C7 v% J) l2 L; A
;; First we ask the patches to draw themselves and set up a few variables
. H/ j! Y: L( y; E/ | setup-patches
& u4 J* m; g) b4 Z2 f+ v! r0 ^2 v make-current one-of intersections* D; j& j9 O5 p o |
label-current
8 E- L( ~. h5 u7 X/ e+ Y5 D8 [% h9 [! E
set-default-shape turtles "car"
a8 w+ u7 B( o: ^, N5 T/ r3 ?7 U; D3 V; v
if (num-cars > count roads)
5 `5 Y4 e9 b- {, l3 [3 \4 y [
7 ?* b- r2 H I& ?3 x# G9 x. P& y$ S user-message (word "There are too many cars for the amount of "
3 H6 k5 e9 a3 L: E: c "road. Either increase the amount of roads "! z. b2 e/ T5 u9 l! A
"by increasing the GRID-SIZE-X or "
7 [ g% w! Y9 @. p6 q "GRID-SIZE-Y sliders, or decrease the "$ F; T, U( j1 C; j" k+ O; `' `: \
"number of cars by lowering the NUMBER slider.\n"
# B: e& q- j3 }$ C! F% z "The setup has stopped.") h" U, D- G) a. |% }3 I
stop
$ ^/ q% u% Y! ~$ F7 ^( E ]
5 O2 D% N! {/ X% ?) X- U" Q+ E6 M) i5 T( t. D% w, c1 V3 j
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! I( I6 @4 n! ]7 P/ `7 ? crt num-cars
9 z* z* n) N. G( V; K: N0 k B [
/ F# F5 U% R- T8 D- @ setup-cars( b$ X/ t+ T7 Q& X" X1 l
set-car-color0 S* N# d' i j$ Q
record-data
) t c( d: s" w9 K( i9 ` ]
, _# r1 q' K6 G! n/ R9 L1 c: ?% }, e' e& |' y! d& ?; h
;; give the turtles an initial speed' g. Z* }1 ]8 F7 Y) E+ T7 T, l
ask turtles [ set-car-speed ]8 E# K1 o0 I2 M
5 D8 a. Z- M g. Y! L O9 }
reset-ticks
* S4 r2 \0 I+ c3 b& nend
( y# x1 p6 x0 F9 i, a4 l7 [6 y
8 j2 B# y1 o- i;; Initialize the global variables to appropriate values
. R+ k& X% Y8 D' b7 Q; D% x/ y3 sto setup-globals
! P9 J; u; k$ `" q set current-light nobody ;; just for now, since there are no lights yet; j1 I5 R; p1 s3 `7 B: a/ G! }
set phase 0
! z" h' j4 n; K& C* O+ L set num-cars-stopped 0( o$ V* ?* e4 X
set grid-x-inc world-width / grid-size-x
/ i8 E4 w- j6 V set grid-y-inc world-height / grid-size-y
" V. m4 @- r4 N$ F
+ c' d3 w* y& A* w7 L ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary! m0 R3 ?% ~; O
set acceleration 0.099
0 n7 O7 e) x5 Y1 Tend: d* R l" ? n) T+ u& J
7 |: J, {/ V% h5 b* X3 {' I;; Make the patches have appropriate colors, set up the roads and intersections agentsets, G" Y% R4 `+ ^) ^% x1 ]
;; and initialize the traffic lights to one setting/ t5 a, K: _+ v, M$ Y6 [! c1 V
to setup-patches
* }7 h! |# C2 r* _8 k" a& d7 R ;; initialize the patch-owned variables and color the patches to a base-color
0 z1 K# ]4 ?4 O( m ask patches$ G6 o- U7 F1 |6 F' f5 a6 X8 y
[9 J; w1 [4 \( u, u% q& V; e
set intersection? false. S" [2 P1 }+ U% m/ d S: I' D" y: l
set auto? false
1 u! [* v7 F x. k+ Y% R, l set green-light-up? true# j- S2 @ x1 k$ w) N; e& I! r
set my-row -17 q5 H3 e/ N' K% M6 B
set my-column -1
0 G9 N3 S+ C5 y% K set my-phase -1
/ y2 u! D' ^" w$ P& j" h: S, _ set pcolor brown + 3
9 W. u; x3 [6 w) m7 _+ _% F ]
}+ h L2 l+ O; c
7 G7 _' d5 \; G4 l; c ;; initialize the global variables that hold patch agentsets' t8 v+ b; M. p, a
set roads patches with
6 u1 G% @9 h( \% `# I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! K5 R/ r1 {, t' k (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. M! Z/ V* }( f7 ]* d, | set intersections roads with
: o6 Z% Q* `7 b3 ?8 o J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
9 N6 W i, U' ?4 J9 J2 v1 A (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 H6 U i& {! q% T% ]1 y" s- K5 Q
+ Z' i0 |$ t0 q1 f9 m ask roads [ set pcolor white ]
! m a8 ^* W" }- m- y, c setup-intersections
7 D7 b& v2 ~' q# N# J! rend
2 B' ]9 |* l7 S P其中定义道路的句子,如下所示,是什么意思啊?. p" a5 ?2 ?5 s4 H- u* F @9 W
set roads patches with
6 {, S% C, ^) a! l( M* s. | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 T" Q7 P5 m, D6 C, n1 m (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) H6 T* Q6 ~% y, Y. n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? |
|