|
|
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。
: C/ Q0 d% Y) x. Z9 h1 x! o0 unetlogo自带的social science--traffic grid这一例子当中,2 L" ~0 V+ r% n. }$ Y% S
globals
7 q% t! ^' B# g& P$ {8 Q% o8 [[* b/ r6 \0 a: L3 D5 T! h' W& F$ [
grid-x-inc ;; the amount of patches in between two roads in the x direction
" M) P4 y# }; [7 _! t. Z grid-y-inc ;; the amount of patches in between two roads in the y direction% M% S6 a6 z4 l/ t, e
acceleration ;; the constant that controls how much a car speeds up or slows down by if2 c' |* E$ v# B. B1 @) c/ s
;; it is to accelerate or decelerate$ y; U& k7 c5 k! D+ N+ p# p
phase ;; keeps track of the phase
+ d( w$ P+ s! |. l num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure$ W3 c# [9 J2 [. X0 h9 |) w. E( g7 J
current-light ;; the currently selected light5 k* a/ i. K" G9 k3 G
. v: _) X1 F6 Y8 D! t: A F% S ;; patch agentsets
# v$ Z- G. }5 ]2 l* W2 { intersections ;; agentset containing the patches that are intersections& T0 P9 b" N# I4 o! l
roads ;; agentset containing the patches that are roads- Z( d4 s, x! T0 w; |! m
]0 u5 }5 V: c5 g7 M+ s" R9 i) }
2 V9 `, D1 ]8 [2 Sturtles-own3 `- e( S! u2 A( N* ?% K
[
/ Y3 Y5 i) `( ?* q$ k0 Z- G% C: S speed ;; the speed of the turtle: {( `% a5 Y3 g! O6 k3 l
up-car? ;; true if the turtle moves downwards and false if it moves to the right: g* x( F" I: p3 f
wait-time ;; the amount of time since the last time a turtle has moved A' ^/ q+ ~5 H% g6 U
]' @8 E- H" D( n/ H
) ~+ W2 m* |0 j
patches-own; [2 p: a7 a6 Y# d" S
[0 z0 \& Z, t; d) \
intersection? ;; true if the patch is at the intersection of two roads
1 t9 D# I4 u* w7 B& V; f t green-light-up? ;; true if the green light is above the intersection. otherwise, false.: M! o0 i6 W# j/ z2 o6 Y
;; false for a non-intersection patches.
7 B% }5 B! j1 _$ h& F- I5 g my-row ;; the row of the intersection counting from the upper left corner of the2 y/ z1 t3 q- `% d6 A) [
;; world. -1 for non-intersection patches.
. D. p1 Y! O E1 N. l7 n my-column ;; the column of the intersection counting from the upper left corner of the
, q# C% e- D) {: k/ d% h ;; world. -1 for non-intersection patches.9 v4 A' K! h0 Y& ~) o9 F' g' n
my-phase ;; the phase for the intersection. -1 for non-intersection patches.+ ^7 P& G6 y# B2 B; Q& m
auto? ;; whether or not this intersection will switch automatically.
" ~+ R; J2 r! W2 j3 {4 m3 e ;; false for non-intersection patches.) g0 }5 I3 E6 t& @, K8 c+ p1 H* b
]
8 n' a, }- _0 y8 Q1 A9 A3 I' G9 u2 |" z' ]1 X& Z4 [
. q% g- u6 ~1 }7 k2 E; H! d% x( W;;;;;;;;;;;;;;;;;;;;;;
: P" A2 }0 ^9 g: Y7 `;; Setup Procedures ;;" ~* y+ E0 ^0 Q" w, b+ Q- P
;;;;;;;;;;;;;;;;;;;;;;+ V$ o2 I# c1 L: {5 F
! l" K L* O6 i# N" i1 ~;; Initialize the display by giving the global and patch variables initial values.
+ c& f6 F( B% u9 e' f;; Create num-cars of turtles if there are enough road patches for one turtle to7 c- z- ^; T5 B* T w+ w$ ?
;; be created per road patch. Set up the plots.' O% X3 v1 ] e9 I- ], L
to setup/ z d; \, m7 }4 N( N+ g5 O
ca
6 h v3 a) t: u setup-globals
- I$ ` h$ S6 O9 U9 c
, V* h/ F( G* y% j ;; First we ask the patches to draw themselves and set up a few variables7 e2 b9 A) X* k5 [* s8 S3 C& d& W+ A
setup-patches
1 h# C; W" {6 w2 z6 U$ F/ n make-current one-of intersections
( k# ~+ e- q5 G/ x0 i' G- R label-current
! X3 S- l" \* x; i6 } w, i# U0 _; a# F$ a. A1 n' H9 v# d* S
set-default-shape turtles "car"" Z0 M7 c$ }# V' l& C9 E
& y. p) P3 |$ w if (num-cars > count roads)
0 m3 O7 ]$ V2 m [' j K0 L6 @( ]: P# O
user-message (word "There are too many cars for the amount of "
3 h1 K L6 L9 @0 Y* w "road. Either increase the amount of roads "% J1 D- N% _0 Q9 Z3 R/ u) ~2 K
"by increasing the GRID-SIZE-X or "0 \5 X+ ` E$ p( B
"GRID-SIZE-Y sliders, or decrease the "
, w) P& c1 p' [; r E/ g "number of cars by lowering the NUMBER slider.\n"7 V1 X# I3 R1 T* s) @- V. f
"The setup has stopped.")
9 w& t* I7 e1 ~1 o# O stop
) B7 Q' u9 Y$ d; m+ W ]
7 s" T4 w& C% K8 U! j& n/ U4 h* I4 `5 M$ ]8 [5 K) V" u7 G1 w
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color Q! T2 G4 Y: X7 m
crt num-cars
( p3 f) w( ~% I4 B2 F! x [/ g3 J/ `1 B: c) G" Q7 x& ]
setup-cars
6 r5 d- [4 P" a- ~7 O$ y! K set-car-color6 T" _1 g+ P" j# e, C
record-data, Y3 k% _1 d. B+ r( I: f
]
4 `3 j, Q7 N( N0 k& M! x: @& [4 P9 ]& ~5 j# i2 ~, `+ v
;; give the turtles an initial speed
5 B: n7 v' |; \4 V# ^ ask turtles [ set-car-speed ]5 x2 A4 Z8 r. F: O1 Z
4 u2 Z' _3 ~5 E$ v" P6 u* f2 e( O reset-ticks& j T+ C O @8 n" m+ O
end
+ P9 p" `* p. N* d' L* Q2 D H/ E1 n# o- C- d9 t) j
;; Initialize the global variables to appropriate values0 b6 d1 H2 H+ J5 s9 {
to setup-globals4 J# `$ [& e5 A* r
set current-light nobody ;; just for now, since there are no lights yet+ \% S3 h6 E2 ]5 M! r5 {3 f3 g
set phase 0( O! l& S% O w7 f
set num-cars-stopped 07 r0 @) S2 w" Z, {
set grid-x-inc world-width / grid-size-x$ v! I, i+ V4 |5 _% f0 D. J
set grid-y-inc world-height / grid-size-y
# M x0 ^; a, s+ I. [
6 s' z7 |( I7 R. R3 g1 [! f+ t ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
9 j8 P8 C2 q7 u/ w" U5 l set acceleration 0.099
( j: b* v* e, H9 f% T0 I' N7 S- mend
; K1 q [: e5 k; I% G
: o! g9 m- N+ u% @- ?8 P5 H;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: b7 |/ Q& P' a3 e. `; k! N, l" y;; and initialize the traffic lights to one setting
, S5 s! |- y6 _+ Cto setup-patches" E0 S! Y) x5 C8 ]0 k9 d
;; initialize the patch-owned variables and color the patches to a base-color' \5 z6 Y/ n& ^" D6 r) l* m! D
ask patches
7 ]- K5 C' C! m6 A) z [
+ e! t/ o3 q& T set intersection? false0 ^: j- D9 I0 O0 Q
set auto? false
7 s$ _! F( {) |; r. ~9 t set green-light-up? true
4 g' ^- d. ~) ^# y set my-row -1
* B5 ?; @2 C1 i+ ~$ b set my-column -1
- j! S; \* ^! u+ {5 ~$ K% w2 k set my-phase -15 Q( c: U* I. d+ k9 p0 D2 C A
set pcolor brown + 3% t# P8 _6 R* V: s, m8 K8 D
]5 @7 C& X* S* O
\# Y! e: M _% n ;; initialize the global variables that hold patch agentsets
7 h+ l. v( y6 D: P4 f set roads patches with
- Z& X9 R) w$ c/ a0 R- S [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, [$ u! B% }1 a2 p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)] L& y) p$ Y, L9 a. B
set intersections roads with# A, i% W" C! ^4 T# K I* B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and( x, f' x' V8 J- n6 \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% Y8 i8 R; K7 u8 q9 Y
6 I' w% Z8 S$ J. h. |( I ask roads [ set pcolor white ]
8 l( B: P e( d; w. p setup-intersections! @" E3 y' |3 H% H
end
" P E5 ^& R! K3 u. N2 l. p其中定义道路的句子,如下所示,是什么意思啊?
, b& n5 G5 g# \ set roads patches with4 A# C1 l9 m6 y( t" x3 {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) c0 ^' o Y+ Z! y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 c7 X2 `7 m! C: b
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? |
|