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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。
( [3 x! Q1 @, T6 [netlogo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* f# r) w5 |. C9 r1 M/ b* a
grid-y-inc ;; the amount of patches in between two roads in the y direction* ]- {2 L/ o6 F# |# g/ C1 y5 x9 Y
acceleration ;; the constant that controls how much a car speeds up or slows down by if: ~$ E5 f7 `* z. \- \5 l* v+ l1 A
;; it is to accelerate or decelerate
/ K3 S3 s/ s1 F3 N9 |& u- B phase ;; keeps track of the phase' `' W9 H, b6 N! M( o& i; e2 X2 M
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
. N$ m+ G% r+ U6 o current-light ;; the currently selected light
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;; patch agentsets
1 l6 _ r6 ^7 F1 t, H+ K intersections ;; agentset containing the patches that are intersections
! t% S- d9 C, x$ C, E+ U, Z* C8 J roads ;; agentset containing the patches that are roads6 {; {- v8 s+ F" U9 |7 i4 }3 R
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turtles-own
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2 B* W! H$ y0 y1 E4 b. ^ speed ;; the speed of the turtle+ |$ R4 m7 m3 ?3 J( R8 s
up-car? ;; true if the turtle moves downwards and false if it moves to the right
9 U% f S' `' \% T6 z% Z wait-time ;; the amount of time since the last time a turtle has moved; S. O: |2 l7 L9 h- C1 [4 t
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patches-own
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, v/ F! `& I' T. g/ ?4 D% t intersection? ;; true if the patch is at the intersection of two roads4 G; o6 m& L, G/ v0 A0 S7 a
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
( X0 @ ?" t: T ;; false for a non-intersection patches.! S% d) {: B0 p& L. n, ?' `9 }! }3 A
my-row ;; the row of the intersection counting from the upper left corner of the3 m' i, u7 u$ f% x% V! Z Y% U
;; world. -1 for non-intersection patches.
% X- ?8 ~' o* s" Y% L my-column ;; the column of the intersection counting from the upper left corner of the
0 w/ r2 x6 X7 {4 s1 c! e$ X$ z ;; world. -1 for non-intersection patches.
( M9 y( t* M2 k, _+ B! L* e$ e R my-phase ;; the phase for the intersection. -1 for non-intersection patches.. ]: u1 I. X% T$ U( q
auto? ;; whether or not this intersection will switch automatically.$ N d8 j! l6 ~9 L$ u X! n
;; false for non-intersection patches.
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! \3 I1 a% N4 Q" Q4 u) V( Z% [) Z;;;;;;;;;;;;;;;;;;;;;;. o! ^, o- V \( X. x M ]- ]
;; Setup Procedures ;;6 C$ J2 Y" J9 @3 C; A, r- v
;;;;;;;;;;;;;;;;;;;;;;7 k* Z: W; x/ n8 s9 A
- E& O4 Q/ ?3 V; t0 u;; Initialize the display by giving the global and patch variables initial values.3 @# u# L# C, |; T$ j$ W8 O$ w
;; Create num-cars of turtles if there are enough road patches for one turtle to' D' ^9 o) u4 K. e
;; be created per road patch. Set up the plots.* P/ L- _/ [8 [! O: e( C- N
to setup5 O! f6 M( [& J# p' g5 d
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables4 j- c& b) O5 X0 b" Z0 D
setup-patches
4 ?; w+ K: s" C7 Q make-current one-of intersections
3 ?- Q$ ^4 z% w! i& K8 K8 H& v8 v label-current2 ~8 \8 I. |) F5 Z2 O$ l
1 ?4 Q* x2 M* ^8 M set-default-shape turtles "car"
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9 C: d9 D3 Y8 g1 d5 J if (num-cars > count roads). u, l) o8 v# K* g% M- U9 x" f3 B7 K7 x
[
9 g. v# c a% I0 @. x( | user-message (word "There are too many cars for the amount of "" x5 @4 X3 y* E9 }
"road. Either increase the amount of roads "
0 @0 l$ ]: o D/ g# P1 G- k "by increasing the GRID-SIZE-X or "" f1 b- I6 h- ^' k$ \6 v
"GRID-SIZE-Y sliders, or decrease the "
# ^% F7 A8 U, v+ F. y0 d "number of cars by lowering the NUMBER slider.\n"
$ ^4 ^3 e/ R$ h. L) F; @ "The setup has stopped."): z/ l$ [. q# S
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- F( K) ?0 ? v+ z e( f+ b crt num-cars
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5 }' W2 w9 O1 w- G2 k' g8 g% u1 G setup-cars
5 j/ B7 ]0 E& `# n set-car-color
7 T z8 E2 n" ~5 w7 z; M record-data
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: F+ u% C, L2 K ;; give the turtles an initial speed+ g7 D; y" }3 M
ask turtles [ set-car-speed ]
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reset-ticks
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2 v8 q! j8 M- e8 e+ S1 g- z9 B: K;; Initialize the global variables to appropriate values1 s7 g2 M( ~, ~- m3 R) r* B
to setup-globals2 I4 K/ [" _9 G+ m5 J/ C
set current-light nobody ;; just for now, since there are no lights yet
: S0 \/ ^% f1 P$ x h set phase 0
4 a; g2 {: ?9 @0 c( F/ t' y set num-cars-stopped 0
9 U" R( s0 Q1 b) J$ t set grid-x-inc world-width / grid-size-x
( U' V5 M5 b5 a8 _ Y, i' T5 Y 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
: g1 i8 {* F& S# u3 q8 f m7 O set acceleration 0.099
7 l7 F+ P! I- D3 M% w* B. \) Xend; R' ~, k" b& ~
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 P$ X) q' p2 ]. |' x
;; and initialize the traffic lights to one setting( U) V" v( [1 D G% f' ~
to setup-patches
2 J9 B* e+ b4 E2 [3 G ;; initialize the patch-owned variables and color the patches to a base-color
! {. H5 u4 X. x4 q ask patches" R* v) ~8 E( N
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& y u9 c6 S- `* H- U9 ~ set intersection? false
3 Z! H M# U4 ~+ l+ j9 P set auto? false X8 q; R0 \) T: P
set green-light-up? true5 ^4 p. E0 n% U8 i3 M+ |( F, r! k
set my-row -1. l+ O6 c0 K8 Y! O/ f
set my-column -1+ X) K- g- ?) q9 z; a7 H- E
set my-phase -18 M( f3 F- L0 V+ v; r K
set pcolor brown + 3
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; U; k8 o0 p# L/ [* d ;; initialize the global variables that hold patch agentsets) c: Y) l9 Y) n \" `6 L5 K
set roads patches with9 c$ v7 ~4 O, m4 C$ z. _0 U; s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' D( g7 Q) Y8 |( G1 b% r3 \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) [5 h, X6 [0 h) r+ H) r set intersections roads with. C& o' S+ n7 K% S/ k/ p5 H
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 `5 y7 @, e: t' ^. g# g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 ]% E0 H$ z# m! p! h7 y
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ask roads [ set pcolor white ]0 Y2 o2 x4 u* H" f; ]% X: D
setup-intersections I, R( P( |6 R8 l3 I3 u: Z2 w6 |
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其中定义道路的句子,如下所示,是什么意思啊?
6 o+ L4 n# y9 B6 F set roads patches with, Q s8 V' m" U, \, ^. R. J: V5 W* {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 \ b5 W4 y$ u( i) t" b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% q9 [) ]6 z0 i5 e
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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