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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。
4 L5 x6 g/ A! m6 q& A D4 i5 Gnetlogo自带的social science--traffic grid这一例子当中,2 j$ ?$ Y) D) m( f) i3 M( V
globals. o7 n, ~- J/ V
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grid-x-inc ;; the amount of patches in between two roads in the x direction5 w; F6 _$ Z' P) q
grid-y-inc ;; the amount of patches in between two roads in the y direction# [+ t' r0 e5 V4 D: K; A9 V0 r. T
acceleration ;; the constant that controls how much a car speeds up or slows down by if
" v) t9 ], X' v9 d; K ;; it is to accelerate or decelerate
. d6 O" a. M E! n2 U phase ;; keeps track of the phase8 v3 w3 f. l8 Q) ?% u# p
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 l; Y" `( N, V9 N) O
current-light ;; the currently selected light
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8 j/ z/ P, w1 S Q$ y ;; patch agentsets# d1 s1 W$ _" U, Z
intersections ;; agentset containing the patches that are intersections
7 k0 u. c" l& I% p! T. v' H0 t7 b roads ;; agentset containing the patches that are roads
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: m! O+ y. n# P; W& R- vturtles-own3 V. G7 S* f, G5 J" I' d
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speed ;; the speed of the turtle
* F7 r! G. [; Q+ e8 x' U, o up-car? ;; true if the turtle moves downwards and false if it moves to the right
5 B. v3 z) U$ N3 F0 t4 u! F wait-time ;; the amount of time since the last time a turtle has moved
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patches-own' b* T; i) B) C$ D- x
[
Z7 l) T3 s; A' I& e' `5 A intersection? ;; true if the patch is at the intersection of two roads
: T+ t$ m; y# E. d5 {6 }$ a green-light-up? ;; true if the green light is above the intersection. otherwise, false.
, n0 G$ |6 S9 J: k6 K ;; false for a non-intersection patches.# F8 F% T: s' b: k
my-row ;; the row of the intersection counting from the upper left corner of the' m8 ^7 k& a! N5 c
;; world. -1 for non-intersection patches.
R( R- [; G _5 r! C my-column ;; the column of the intersection counting from the upper left corner of the1 V3 [4 ^) P$ z4 ^" L4 o$ |- ~
;; world. -1 for non-intersection patches.: s) y1 j/ L6 s8 R: R
my-phase ;; the phase for the intersection. -1 for non-intersection patches.( P- n1 B, q! D: P5 |! Y3 J7 \
auto? ;; whether or not this intersection will switch automatically.0 V5 H" @" b6 }- j' e( x
;; false for non-intersection patches.* s9 W" ^% a- e( e5 L! N' ]
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;;;;;;;;;;;;;;;;;;;;;;
0 g8 h5 m' ^" v# C e9 y/ f;; Setup Procedures ;;1 v! X% y0 a: `% D* r
;;;;;;;;;;;;;;;;;;;;;;% N, y1 x9 k. A: Q% f
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;; Initialize the display by giving the global and patch variables initial values.
& ` ^2 S/ j* o$ p# W;; Create num-cars of turtles if there are enough road patches for one turtle to9 @/ z$ J# L* t# F" p& j$ f
;; be created per road patch. Set up the plots.& ~9 D1 f, B* C# i9 i' i, e z
to setup
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setup-globals
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+ Y* Y, b! V, o, M+ L# J ^6 M" a ;; First we ask the patches to draw themselves and set up a few variables
3 \" {+ x( D: o2 L" ? setup-patches( _& I/ J* |( h* g7 @4 z$ B1 t
make-current one-of intersections! V l2 V. T* q( s b
label-current5 `* K% T- N7 L) V% e
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set-default-shape turtles "car"
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if (num-cars > count roads)# Q9 t( z4 q+ Q- L6 ?
[
7 j, y% [2 M8 b# i, z8 _# i user-message (word "There are too many cars for the amount of "% M* j- _) g5 T* h* Y
"road. Either increase the amount of roads "2 j: }* X# E. W+ U# i" I6 J
"by increasing the GRID-SIZE-X or "' a5 @$ f! q, g) {
"GRID-SIZE-Y sliders, or decrease the "' C4 G6 A) P3 e& I8 F% d* o
"number of cars by lowering the NUMBER slider.\n"' u4 s m$ V9 [5 b! J: N9 `
"The setup has stopped.")
" w9 C6 {: L$ m; s0 x' M stop
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( _- e0 I; j+ B, O ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( _7 T9 `- W7 {7 i
crt num-cars6 `& w( A2 D( R; {4 {
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setup-cars$ g& q* A- G3 K
set-car-color
% l% D+ E; A3 n4 Q e8 w record-data
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;; give the turtles an initial speed
+ ]3 ]9 r! _9 m0 ?1 V& K7 Z# V: [2 l ask turtles [ set-car-speed ]6 j, v% h4 R7 D8 h
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reset-ticks: }+ ^" h1 t+ z4 b! @
end
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+ L/ j9 {* a$ m K3 c5 V;; Initialize the global variables to appropriate values0 c9 h, ?6 i5 v5 ?- }5 s
to setup-globals: F6 ]! B" g+ S; s- t' z
set current-light nobody ;; just for now, since there are no lights yet5 }0 M8 n4 u. f( y) N6 F
set phase 0
2 O: [4 J( e; C0 n set num-cars-stopped 0( e1 T4 Y4 L" U) o7 T6 O5 P
set grid-x-inc world-width / grid-size-x
! k \/ g/ V, g) ] m3 U: ]6 b% } set grid-y-inc world-height / grid-size-y B& e1 l0 g. R; o
& X5 ^/ M+ G& ^ I- X' v ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
% U- c/ \, Q4 e2 _! j set acceleration 0.099
3 l6 @+ P2 L2 `8 V* ^end, ]# B8 c7 C" _1 I
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 W. c- ]. N& ^+ l) U
;; and initialize the traffic lights to one setting: w* _* j: T) O$ i
to setup-patches
Y! a5 V2 M# ` ;; initialize the patch-owned variables and color the patches to a base-color+ U9 E) d, ~. o/ w
ask patches
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set intersection? false
( n' Z+ k0 t2 A set auto? false3 M8 ^, X5 p5 N6 A
set green-light-up? true# r1 q k. T# y b3 }2 K9 {8 H8 Q9 \
set my-row -1 V+ j! b! h' Y7 S" @
set my-column -1
7 s8 j; T) W: L" Q# m4 T set my-phase -1
% E9 Y9 I" y. W Z) y set pcolor brown + 30 {: z" E. }. s3 {
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;; initialize the global variables that hold patch agentsets
( e& D# P0 f2 }4 v2 n0 u: M, D set roads patches with. @- o+ Y n0 Z: D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" y5 G {6 M7 h3 V9 u# f: c (floor((pycor + max-pycor) mod grid-y-inc) = 0)] ?, i/ W( z6 ?7 I
set intersections roads with9 Y" `: \; p( G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ o+ d) S4 k% \- E2 x9 g# `; O5 ]. u
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 _, |4 C! x, H8 r
3 }( c- v: r' M* V7 F+ c( q1 z6 } ask roads [ set pcolor white ]9 p% U0 W0 {- Q3 H1 B* e' l
setup-intersections' Y4 D8 C1 j8 i5 c2 X' \* q8 J
end
# L* _$ q2 [9 Q6 P- V其中定义道路的句子,如下所示,是什么意思啊?4 W% I }$ D, a0 o, d1 x C
set roads patches with# L5 Y( ^9 l( r4 Z3 d
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 q$ `6 ^7 P, s T' A5 p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& A6 F1 l5 S( b2 |( E; B$ c
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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