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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。, S: K, H2 t5 K& S; K, \. G
netlogo自带的social science--traffic grid这一例子当中,1 {) ]5 c/ { A' z- M( G9 r$ T) l
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
1 U6 w4 ?6 d2 e: J. m grid-y-inc ;; the amount of patches in between two roads in the y direction* z: O4 N6 D% N& W
acceleration ;; the constant that controls how much a car speeds up or slows down by if& D `, V0 \( U1 Y# G8 B' ^+ r
;; it is to accelerate or decelerate
" K( G9 a: a2 A phase ;; keeps track of the phase
$ x7 Y) ~: l! ~ N& P num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
' ]* K+ K3 W& y. E# m current-light ;; the currently selected light
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( a+ F# `9 ?& F$ t6 T ;; patch agentsets
9 ]! E/ H# h* t' _( t* @( t intersections ;; agentset containing the patches that are intersections
# u- i) a9 z ? roads ;; agentset containing the patches that are roads- g- Q" K, v* `
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7 v! b& m6 q% j% A7 q* ?; W. wturtles-own9 T2 y+ z' t/ x: g. k
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speed ;; the speed of the turtle& Y/ [* W) E5 F
up-car? ;; true if the turtle moves downwards and false if it moves to the right- t7 t# U, c/ P d
wait-time ;; the amount of time since the last time a turtle has moved7 Z+ ^: v* C$ c3 l
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) y$ S7 L! f, Gpatches-own: H- J0 ]8 Y U3 I |& Y
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& g# Z. O* `( j) _+ R intersection? ;; true if the patch is at the intersection of two roads
- ?' I2 i9 e! Q% n8 ~ I green-light-up? ;; true if the green light is above the intersection. otherwise, false.) {# ?+ I4 s( Q4 f
;; false for a non-intersection patches.
7 I7 I% W: [ Z; }! g my-row ;; the row of the intersection counting from the upper left corner of the
$ V, ^' Y5 p. r3 X/ ` ;; world. -1 for non-intersection patches.9 L1 I8 U* G' F# V9 c
my-column ;; the column of the intersection counting from the upper left corner of the
2 T. d+ L d! w5 _5 ?; w ;; world. -1 for non-intersection patches.
- F/ e+ Q# y3 v- D: k8 c. I( R3 Y my-phase ;; the phase for the intersection. -1 for non-intersection patches.
x( b: O, N3 W3 { auto? ;; whether or not this intersection will switch automatically.
& c" ~6 m2 W6 g7 s. U: T ;; false for non-intersection patches./ d0 F( S+ Y6 l7 Z" H% F8 m
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- `6 i* R; B6 e$ C6 w* B;;;;;;;;;;;;;;;;;;;;;;
7 O& f! j: v6 m0 K) M. G1 f* u;; Setup Procedures ;;( N: T0 j( ~7 b( j( Z$ W7 Q+ S& a
;;;;;;;;;;;;;;;;;;;;;;( I1 ]+ p# q, ~) A
: D! m. \2 l- @$ c. {1 G6 X;; Initialize the display by giving the global and patch variables initial values.
$ Q2 L* i: @ n/ u1 n/ G! {) J;; Create num-cars of turtles if there are enough road patches for one turtle to, N; P( \2 Q+ ?" _1 J
;; be created per road patch. Set up the plots.
- y# \! j7 N9 s( X; P) _to setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
' I \% s6 L/ f# K setup-patches* A4 Q+ _( C3 `! V9 P# d' O
make-current one-of intersections
7 L, U! s1 L& e8 X6 Q* K' j/ [9 A label-current1 ]* b# y" g, m1 J2 [' {
3 ?8 e5 G9 j8 R7 R3 q9 ^; P set-default-shape turtles "car"% j: R" }! |7 T+ @* ~
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if (num-cars > count roads)
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9 q6 i8 `; b! s9 a1 e5 g user-message (word "There are too many cars for the amount of "
M2 _' a+ a! _ "road. Either increase the amount of roads "8 j" ^1 i% T7 e7 ^
"by increasing the GRID-SIZE-X or "
/ G8 W% U( ^& v B4 i- J "GRID-SIZE-Y sliders, or decrease the "
$ ?: x& K! O+ |# z "number of cars by lowering the NUMBER slider.\n"
& h4 |8 O% `; V( a$ a "The setup has stopped.")
) e8 J$ u# r, Y+ ? stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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6 j& f0 d6 W# J, t g+ C setup-cars4 G- W7 V& L5 D) g$ z
set-car-color
* x0 c5 A% h4 [: V- A+ j8 X' [+ a record-data
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" B2 B; z1 S$ h! v" Q$ v4 h ;; give the turtles an initial speed
8 ^ |% r1 x2 k3 b4 t; o ask turtles [ set-car-speed ]7 {7 k7 u' b# H% m: i6 v0 @ ^( c
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reset-ticks
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;; Initialize the global variables to appropriate values2 J; T, `6 I; n9 H+ ^8 P2 y
to setup-globals+ M0 ]9 a) s* z" N: m
set current-light nobody ;; just for now, since there are no lights yet
& G+ M4 F( D* b- w set phase 0
2 I' @0 ^2 G! b; \- B! z set num-cars-stopped 0: q2 `7 w7 l ~# Y! ~7 e! s& `
set grid-x-inc world-width / grid-size-x
# ]/ f0 ]4 H; g' V set grid-y-inc world-height / grid-size-y8 W- \0 W* c7 h" ~* ^7 `( D
& K- Q! Z% G* ~4 |+ ?7 C ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ B/ O* W* `+ r7 U% m1 C6 }, _6 ]6 b set acceleration 0.0991 P* k% _# ]: \" w& ^# n$ V
end
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+ q% ?6 U% h6 i( v2 U+ Y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. i/ A7 Q; y7 m3 X1 [. I;; and initialize the traffic lights to one setting6 I, {3 K' o; n: s# R: `
to setup-patches
! ]( v0 I" K9 d, z2 v' c ;; initialize the patch-owned variables and color the patches to a base-color& \3 L* C, K4 n7 i/ ~% Q' d4 E6 z, l
ask patches
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set intersection? false8 s+ m) w: \' N. C5 T# W
set auto? false, @9 y/ T; W* Z+ n, C" K" f
set green-light-up? true
; I+ ^/ F) n! D2 V set my-row -1
0 \7 g( r1 f, z$ ]5 V( v* S set my-column -1
2 t: V/ Y4 c3 S6 v A$ ^! I. a set my-phase -1
6 v* e( g8 U* p# S2 i3 p: Y set pcolor brown + 3# `# A& j: t3 @' }- Y4 y" x
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;; initialize the global variables that hold patch agentsets
3 `: D$ J0 q# ` ]$ z% ] set roads patches with
* A' ?4 t9 U7 H- |$ y8 G+ m& T7 U( g) a [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 F: I; n9 R9 x p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 Z# X7 ]: F; o6 Z! t0 H4 } set intersections roads with/ @# E7 j6 b, ~8 ^. h$ E
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 x L' j* Y) k0 X* B (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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9 }* {1 T8 g( D, h$ A2 X; b ask roads [ set pcolor white ]9 K, N+ z% i, h, Y
setup-intersections% q8 g5 K% j- ?- U
end/ D* I, e3 J) b8 W2 ?% i8 A
其中定义道路的句子,如下所示,是什么意思啊?8 `6 w1 E' C, e3 J4 H7 _
set roads patches with7 z# F, v) K0 A! a
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 l9 R6 U S: J' m; m! e- k" D (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; S) f$ {* O' S7 p+ q% o- S0 G8 u# ^2 }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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