|
|
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。
& I8 H$ t& s5 g8 X( Y& w; ^, W4 mnetlogo自带的social science--traffic grid这一例子当中,
0 D" a" R( R I! C+ B, rglobals- j' D) P& s3 Z+ r2 V
[9 W D4 `; g. a/ n! i, ?8 f8 _
grid-x-inc ;; the amount of patches in between two roads in the x direction
4 t5 V4 w( P! g grid-y-inc ;; the amount of patches in between two roads in the y direction2 W/ |+ b, J6 F% M% I( ]/ W
acceleration ;; the constant that controls how much a car speeds up or slows down by if
, I2 i( Z( C5 s% y% Q$ ? Z ;; it is to accelerate or decelerate
! o7 b1 G9 D6 V3 ?" }0 p phase ;; keeps track of the phase3 i* ]# N0 m0 G
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure, `" i) ]. l0 @$ ?, p4 _& D
current-light ;; the currently selected light! T* m, @' z8 {1 M; X
# O6 k' Q+ M; B9 E
;; patch agentsets
- O2 g/ C o+ {. D! X; N intersections ;; agentset containing the patches that are intersections
0 t. \, ~2 \& ~! } roads ;; agentset containing the patches that are roads5 J2 D6 G2 H7 Q% N
]: e# S; e0 ]1 f7 \) Y
$ H/ a* U# z; a }) s9 t) L6 L
turtles-own, k$ I, x+ J! m5 `3 T
[
! b% y! R: F- A/ Z% |$ m speed ;; the speed of the turtle
( N" t" q8 D6 X7 p4 W6 W9 Y up-car? ;; true if the turtle moves downwards and false if it moves to the right7 q$ ~1 w% u/ N
wait-time ;; the amount of time since the last time a turtle has moved
( h' A9 u5 m6 \. L1 S* B1 f]
6 s4 F1 r v" Z0 A9 h8 @
4 t+ E5 C% Q+ m& u/ [. v+ i$ A2 Rpatches-own4 O; R8 S' i$ Y8 {* I
[- T2 @& E! v K7 M& m
intersection? ;; true if the patch is at the intersection of two roads
) ?) F4 [1 W! ]0 {' |- D green-light-up? ;; true if the green light is above the intersection. otherwise, false.
! f& L6 L: y% k- c* r& \- N& |- g ;; false for a non-intersection patches.
: I" u, K8 o4 T# R% J7 [2 r: { my-row ;; the row of the intersection counting from the upper left corner of the0 [ |( u) H3 @( O0 |& }: k3 s
;; world. -1 for non-intersection patches.
7 k4 D% |. y% d) Q my-column ;; the column of the intersection counting from the upper left corner of the
8 Q8 y/ d% j) B ;; world. -1 for non-intersection patches.
/ L2 l, `- @5 ]8 X! ~$ I my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( Z2 H) W5 m, U: Y auto? ;; whether or not this intersection will switch automatically.4 K+ C$ ]/ f5 k
;; false for non-intersection patches.3 c3 [; h1 p8 {* R( K
]7 t2 N2 q2 m0 z! s
9 O1 C# R/ w$ L* }+ E3 m( {2 r4 X- d
;;;;;;;;;;;;;;;;;;;;;;6 { J+ c3 h; Q2 `7 \$ U
;; Setup Procedures ;;: c2 m3 B& _8 M N% v8 n4 P5 _( V! s
;;;;;;;;;;;;;;;;;;;;;;
7 {! t9 U) K: k& V _$ e( f1 h! h0 j- m+ d" [; T( F; J
;; Initialize the display by giving the global and patch variables initial values.) W$ r/ c o# x" b6 o. p) f# w0 r
;; Create num-cars of turtles if there are enough road patches for one turtle to) u7 J# M0 L% T! ?4 _
;; be created per road patch. Set up the plots./ Q5 Y' }" b& s) P, d
to setup
- }9 B5 B8 m: N9 v3 g$ H% w0 V ca
# c! R9 `: d; _! c; W( y setup-globals( k3 ]/ p. J5 o. P
# T4 h: ~7 G2 t0 Z. m ;; First we ask the patches to draw themselves and set up a few variables& ^+ m2 s! b9 ^5 t
setup-patches
1 T$ C- ]! Z+ P& x4 q: C make-current one-of intersections
, \$ y) f! F% w0 {3 L9 b5 v label-current# c E/ H) D3 o, l8 S1 H! }) }
$ v. I; W* t n set-default-shape turtles "car"
# W D2 p. e5 K8 H& U% u+ o* c. G5 L
7 X$ ]3 I! {+ L if (num-cars > count roads)* K3 s; L% E6 r& t" k3 A
[
- Y$ w9 |1 I7 P% h" M4 l user-message (word "There are too many cars for the amount of "
4 | R, _ H% E0 [! C' ?% e& R "road. Either increase the amount of roads "( p3 C2 |0 E# v7 A5 M
"by increasing the GRID-SIZE-X or "
, X; L8 _% b/ s/ H' d "GRID-SIZE-Y sliders, or decrease the "
" H9 V7 }/ r9 S2 X. N) k "number of cars by lowering the NUMBER slider.\n", l% V9 V7 R4 [
"The setup has stopped.")
# U+ z1 e2 J$ ~( z+ Y stop+ g$ }* [, S P* |" o8 R* o
]6 H( w5 N$ `3 y, z6 D
* l6 H( v0 I1 m* p2 s$ U2 D
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ v6 v3 d# U% @; `; w2 P
crt num-cars
2 u6 U& _8 P1 G [
0 K! w R& s r g setup-cars6 T/ Y; z* f% y, `# T
set-car-color/ b6 d i8 T! Y0 S0 h
record-data
4 C# S1 l, h6 B+ D5 C# D$ X i ]
& b9 ?7 |3 [5 o$ |* r7 K
6 R8 F. A0 w1 m8 m, s ;; give the turtles an initial speed
1 p: U! ` z* i- S# M; V ask turtles [ set-car-speed ]
7 e8 N$ F$ Q! `7 p, F! x% P
# d. C0 ^; Q7 l; x* R V8 R* U7 A c reset-ticks
( i; h, S4 T9 A ?) ]4 W" nend
1 S0 A4 @1 r6 R# ?; Z) O/ }
5 ?' h% `1 L' U {" }4 i9 [9 U4 V;; Initialize the global variables to appropriate values
9 W. ~8 s: B- a- U! q2 I' V# \4 r. pto setup-globals
7 P9 \$ N5 k2 l set current-light nobody ;; just for now, since there are no lights yet# h t7 j) ~) B& s1 v
set phase 0
: K/ I0 r/ U0 x1 ?% n2 e' S set num-cars-stopped 0. _( z0 v w% X1 H$ t
set grid-x-inc world-width / grid-size-x
5 n D5 J0 Y# d: w; x3 a set grid-y-inc world-height / grid-size-y, ~+ S1 ?" e- j- e0 }& @9 M% j: t
* Y3 o! C- f$ K- r
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# ^" V0 q) g6 U5 M set acceleration 0.099
, I' Z6 }2 u- Z: [, |end4 y7 P6 M( V6 U# l( N( Q
- f+ \% `6 N, @6 k. g3 g;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
( G' Z9 J3 ]' K1 g$ U( t; A% Q;; and initialize the traffic lights to one setting
* T& C5 s7 ^$ \' v- l. @to setup-patches% Y9 A, x3 q" ^& Z" j
;; initialize the patch-owned variables and color the patches to a base-color' s) h0 D6 S- N' J5 k7 S
ask patches
$ E H- y" e* ~: ~7 z [
P+ |* B9 p5 L! c( x set intersection? false/ e3 L8 m. D& G. n4 e% a
set auto? false
& k2 x" I0 E* j; T. b8 W set green-light-up? true$ ^4 `$ X& y* y& n0 x& ?. O1 T
set my-row -1
, d/ r7 T) A, K1 y. Y6 f- I set my-column -1+ \/ U, g5 L/ W! ^$ L
set my-phase -1
4 S8 k- v1 w5 ]3 z set pcolor brown + 3
4 P0 h$ X, o6 U% u" i ]
/ W8 ?/ K- w6 c* _
3 i7 U' E. U" C* x ;; initialize the global variables that hold patch agentsets+ ^3 ~# {5 n: u T1 P: j' f+ x
set roads patches with; P" x# n4 z$ `6 f' o) ^: F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 I( E9 Z$ |) |2 }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 M u: x+ o2 L6 h" E5 A, `" K
set intersections roads with5 l, ?: a$ K% t/ L, E) T
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( s& m0 X- j6 J4 d. t6 u. \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% G" d" i8 v" Z+ o1 X
/ c$ c- R8 V! k" H; J% `( {% r9 V ask roads [ set pcolor white ]
$ N, t. U5 `7 D' l8 g: p& W setup-intersections. U$ V+ i6 R. T) D
end
( }$ j( ?' K2 U: X( N其中定义道路的句子,如下所示,是什么意思啊?9 L1 q2 F* ]9 F% k; h8 L! ~
set roads patches with
4 P s& p: l7 @' ]1 P- r* C& U [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; b7 m4 v" m& v8 l, z- _9 N. ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 B2 u! ^1 l& R1 ?
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? |
|