|
|
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。& y" a# G, ^6 f& F" t# p) P9 ~# c
netlogo自带的social science--traffic grid这一例子当中,
% t4 V) s% Q+ k% }& V1 Oglobals
- K, Y; O" {+ }/ d[
* ]& q$ X" g X! n# e grid-x-inc ;; the amount of patches in between two roads in the x direction" C1 G0 N# `# M/ s9 x# P6 Z& X
grid-y-inc ;; the amount of patches in between two roads in the y direction
6 X# C3 w6 `. Q* p) o acceleration ;; the constant that controls how much a car speeds up or slows down by if+ b( S: m8 o) v2 s- y
;; it is to accelerate or decelerate, z* h* c3 s" z. {- f* a; ?
phase ;; keeps track of the phase
L: k0 g7 p6 y9 u/ L num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ X! D$ i+ f2 J. d/ K3 U current-light ;; the currently selected light: U- _0 {9 l6 v; i7 M# B$ t8 Q6 B
7 T1 S: a0 C# e4 a6 P' z ;; patch agentsets) N" o# B6 o6 M! B$ @2 P# |6 S
intersections ;; agentset containing the patches that are intersections p! o; }' f1 o. ?
roads ;; agentset containing the patches that are roads4 ~# _# J/ k N( b' P( e6 w& L9 d
]
$ h: ]0 y" A& ?8 E
5 x% k4 x/ P6 p8 Aturtles-own, B. Z4 P$ i6 ?& `2 y
[
8 K/ I) V- h" r speed ;; the speed of the turtle* o8 D9 R9 A3 y( k. W' y% R
up-car? ;; true if the turtle moves downwards and false if it moves to the right
2 k4 L+ i: F- `( i) f wait-time ;; the amount of time since the last time a turtle has moved, t0 K0 I/ x) ^( a6 S) O! ?
]
) V% z) K! |5 |9 r3 I( Z
5 y6 z7 i% p, o8 w9 O0 S3 zpatches-own- W% A' j8 z, K
[
5 s( n1 t4 d# X, c V( j intersection? ;; true if the patch is at the intersection of two roads
* _+ y0 E5 t# j green-light-up? ;; true if the green light is above the intersection. otherwise, false.; M8 O W6 j+ T; ]' e. C
;; false for a non-intersection patches.' C& s- B5 b+ W4 X3 H9 T" L
my-row ;; the row of the intersection counting from the upper left corner of the! i( V) d* H* s/ y/ f: m
;; world. -1 for non-intersection patches. H0 o3 @; m/ J ^* |8 K
my-column ;; the column of the intersection counting from the upper left corner of the+ `! z# b2 b' t2 y& p
;; world. -1 for non-intersection patches." {6 Z, k9 t ?4 g- I. R
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 N5 {2 e6 G5 R' l) b. }- ] auto? ;; whether or not this intersection will switch automatically.
( L: |/ Z. I' G$ n( Y- g1 u& a1 A ;; false for non-intersection patches.+ U! _ x9 p0 O; M: f
]
0 N+ Z$ t: {! `! b9 n; L9 c* |4 ^% z% p* F
& y& j4 n: ?' z0 W
;;;;;;;;;;;;;;;;;;;;;;
5 y) }1 W& |5 y+ o& ~/ u1 K ^, G;; Setup Procedures ;;
, b7 B$ R+ I5 w;;;;;;;;;;;;;;;;;;;;;;) O' ~- Q+ ?- n% e
1 o: V8 l. {0 j% d1 @;; Initialize the display by giving the global and patch variables initial values.: S7 I9 Z. [* g
;; Create num-cars of turtles if there are enough road patches for one turtle to
7 A9 T: |/ w7 p0 C m, a5 F; \;; be created per road patch. Set up the plots.# s' x# y# s" {- j! W- h
to setup
! W$ R T4 I; z5 u; d ca
% @& w W! Z" X( \3 @ setup-globals
, J5 x: ~6 p/ A; o: n, u
) u8 J$ |* q; P& A6 A g& Y; ` ;; First we ask the patches to draw themselves and set up a few variables5 w5 a4 z6 v& F6 i9 T3 q
setup-patches
$ w+ S' O# C l3 q2 B, z& K* \5 w make-current one-of intersections
1 `9 z2 ?+ D4 I9 b( r) g* ~$ v label-current9 f$ _) S5 c+ k e( p
# M" G0 y& U1 N2 {# g set-default-shape turtles "car"
5 w7 `8 B+ i G. P" [( J# W1 A$ |+ X( h
if (num-cars > count roads)
0 V h% O* D" H+ [ [
7 Z3 U+ P! d1 H( r0 @ V user-message (word "There are too many cars for the amount of ". p: d5 G7 W& n1 D
"road. Either increase the amount of roads "' O: _; c3 G8 F5 P
"by increasing the GRID-SIZE-X or "' _2 U b8 q' Z, ?
"GRID-SIZE-Y sliders, or decrease the "
$ a7 h5 l+ t) |# ^9 l( M "number of cars by lowering the NUMBER slider.\n"
^& P4 m7 K: M X+ v9 V' @( n "The setup has stopped.")
+ G6 k9 u7 s% m. ]+ S stop
* C u- w" u( l) u9 e( D ]+ S! t$ W) k* b% }3 [ f
+ t' {, j% P9 y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( x5 }9 U% ?: T0 E7 H4 n/ i2 j
crt num-cars+ ~- l* l+ `3 V- l; \7 J' ^
[
( l% g) N. o+ Z setup-cars
8 k9 P8 s3 {$ [ set-car-color0 O$ H7 o4 }+ a3 s
record-data
# i: G2 s# g% Y ]
$ L- {5 E5 g/ `8 U K: H
7 Q2 ]2 w* ~. `( ?+ V ;; give the turtles an initial speed f8 l( W/ J/ o, x/ p. W2 M
ask turtles [ set-car-speed ]
- n; [8 s4 }8 a9 s/ w) H: @4 K
6 h! j% y7 I# @0 e& A7 ^0 I reset-ticks: ]9 b) P) D1 ^7 A0 k( d" F
end
1 M4 E, T. q5 r% r
4 g9 {% k; t5 K& E;; Initialize the global variables to appropriate values% Y, b' L1 `* C- ^
to setup-globals
2 g* M. Z4 I8 r$ z# X5 X set current-light nobody ;; just for now, since there are no lights yet
@3 T( u$ f5 F1 I2 o set phase 0
5 T! N* w9 W( B, ~5 d set num-cars-stopped 0/ {5 |2 O5 n9 J" k+ ?3 Q
set grid-x-inc world-width / grid-size-x
5 g7 E; q) t) q% r set grid-y-inc world-height / grid-size-y6 z$ {* X4 @" k7 H, v8 h6 Q7 C! \
% v w7 |4 s5 _0 y* I( K% |
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 E; [! A0 ?/ e7 b0 w; a
set acceleration 0.099$ y' r' X* O3 s
end8 [0 [' L6 s/ d3 ^, ?% h6 b
- w: w1 Q' k; a! z c
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 K/ x0 L* l* D/ R8 X) J;; and initialize the traffic lights to one setting
6 R# D8 m% P1 z9 o; ^/ E- ]to setup-patches3 J. `+ U- b. o& d1 k
;; initialize the patch-owned variables and color the patches to a base-color
+ |4 U- ?5 z# \3 K4 P5 N ask patches
* J5 D8 X" x# y( `" O [
5 H) q3 j9 \1 C; y+ K( z1 g8 e set intersection? false
, h* O5 c/ f( [* i. W set auto? false
6 }' z6 x& q6 @/ y9 Q7 W- Q. N5 a set green-light-up? true% W" A5 f K% E* | [6 h; A
set my-row -1* K: ]) W1 w# B
set my-column -16 \% f' I2 g" w2 r1 P
set my-phase -1
7 Z1 r7 i/ Z+ d7 | set pcolor brown + 3
8 c) [+ j0 I! |. b p3 e ]3 w% e4 T ?& y+ F
# v5 P$ y3 T. O
;; initialize the global variables that hold patch agentsets& K; d3 H% y+ l4 [; c O# p
set roads patches with! w. F1 ~, f2 N( ^& F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 l) m! L8 j% U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# [7 s* d* B. d% M: ?! B
set intersections roads with
/ G( A! P! {2 {1 n Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. D0 Q U! |% @5 f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ J2 Y2 P- \4 N
' V3 a8 T4 ]6 J0 b( C: S
ask roads [ set pcolor white ]
' y0 v9 \+ \2 H4 j# U setup-intersections" q9 I# X9 D: D/ \ x) B+ ^
end
% p$ U3 H3 u3 f2 a4 b6 y其中定义道路的句子,如下所示,是什么意思啊?
; H0 @+ N; f0 U, }8 L& B set roads patches with
( s+ S9 y% G# y4 E+ B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: C) E+ y; v- t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. |- b5 V9 V8 U6 e0 e. L; D- f
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? |
|