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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。7 ?$ ^. P! w. q5 M% ?
netlogo自带的social science--traffic grid这一例子当中,+ n4 E( n" m5 e
globals. p$ X. n1 t5 @& }' f9 {
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+ k* [! K- J& s( K2 O grid-x-inc ;; the amount of patches in between two roads in the x direction1 S% U, Q" z/ p, l
grid-y-inc ;; the amount of patches in between two roads in the y direction
- e C7 J* s( \2 S! f* W) ] acceleration ;; the constant that controls how much a car speeds up or slows down by if+ S- C; f' y: k% p
;; it is to accelerate or decelerate
5 u I9 J( A& e7 \7 S phase ;; keeps track of the phase
6 }& |( @* Z/ J+ j; Z$ J. F( ^ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
3 N3 W8 {1 a4 s- [4 j& S current-light ;; the currently selected light
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;; patch agentsets
+ D$ Y9 c$ K/ H; C intersections ;; agentset containing the patches that are intersections/ ?5 M* F: G0 q2 x
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
" K) j7 J$ L; K& F! b up-car? ;; true if the turtle moves downwards and false if it moves to the right
% L. F5 c! y6 u, L; q0 p/ [- D9 f wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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+ f# O5 I* p* w b9 z2 e" d intersection? ;; true if the patch is at the intersection of two roads
* c6 v" f9 e; f( f0 o" G$ s$ W( k green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 u1 D6 M1 o% i0 e1 K
;; false for a non-intersection patches.
+ }4 |8 F. s' k my-row ;; the row of the intersection counting from the upper left corner of the7 j- ]- t% Y6 y$ e
;; world. -1 for non-intersection patches.4 T1 F$ x7 n1 ]0 O* J
my-column ;; the column of the intersection counting from the upper left corner of the
; O6 t+ W5 A+ l) V8 |8 S/ p ;; world. -1 for non-intersection patches.& J: T& A/ t9 j. m
my-phase ;; the phase for the intersection. -1 for non-intersection patches.' Y& c0 I, V% `' J
auto? ;; whether or not this intersection will switch automatically.4 z9 k/ ^& w" Z* A" F. \) L
;; false for non-intersection patches.
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" G% c# V) L( i) c' z;;;;;;;;;;;;;;;;;;;;;;) ]2 E& _4 a- g* F
;; Setup Procedures ;;2 S: m! a j8 U! w0 H* `
;;;;;;;;;;;;;;;;;;;;;;
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$ Y$ N; x; o/ o, ~;; Initialize the display by giving the global and patch variables initial values.
. l! \1 r7 K) W! E' e5 ^;; Create num-cars of turtles if there are enough road patches for one turtle to
! ~# W5 J0 p% F& a8 t4 p% q2 X;; be created per road patch. Set up the plots.; W7 y2 g5 q* C( n* H( Q7 U4 B; o
to setup
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$ U8 p5 \2 _( f0 I, w# k( b setup-globals
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( {: s+ ^9 n6 U4 D5 ^2 k2 }2 B ;; First we ask the patches to draw themselves and set up a few variables
. ~$ m& R" @* j setup-patches% ~, D" h0 \7 _) R4 j: S4 k
make-current one-of intersections2 |4 y3 J8 P5 ^: R3 q' T
label-current
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$ b9 L8 a7 o( A8 N/ f. r set-default-shape turtles "car"
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& m" `/ H6 R, l! Z, H if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "4 | d/ U. ]* K* o2 a
"road. Either increase the amount of roads "- _9 ~* ?- O c* W- W: s! c/ `8 m8 j" v
"by increasing the GRID-SIZE-X or "
3 Z4 `; c# c+ D2 N# J+ q o" O "GRID-SIZE-Y sliders, or decrease the "
* ]; H* `8 e( k5 X0 Q7 a3 s' D! y "number of cars by lowering the NUMBER slider.\n"* r+ H: U" |# m' n
"The setup has stopped.")# x- t6 H K* k% n# v; W1 N
stop6 o% ^& ~% Y" G$ K8 n2 A6 H
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8 s3 L& a/ s% D ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, E- e7 g3 ?9 }- f* T crt num-cars! I5 F8 t e5 E
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setup-cars- C9 e% |( O4 W
set-car-color
8 Q7 c- j) d, N5 J; j" F k$ n- ] record-data
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;; give the turtles an initial speed, ? P# m8 r r. _4 ?# O9 t
ask turtles [ set-car-speed ]1 X6 i% T! [9 [/ ^( @, ?
! S, o) C6 b9 r reset-ticks* j" {5 |% r8 z+ R
end$ ]2 a1 b& T" h! `1 @
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;; Initialize the global variables to appropriate values
$ G) z, q- M3 p, ^to setup-globals6 v* D! _. k2 _/ P1 d3 o; q; k, [
set current-light nobody ;; just for now, since there are no lights yet$ q. Q* m+ g. S) A) m9 a: W
set phase 0
+ O# F0 h, Q" J& N9 k set num-cars-stopped 0, u9 T. z) n) H* I1 G% g: a
set grid-x-inc world-width / grid-size-x
2 o. P& y2 y+ X4 e( ? set grid-y-inc world-height / grid-size-y
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6 I; E+ i) P; R; T2 Q) Q0 [ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary; D0 ]1 V3 Q, @# D0 d- l
set acceleration 0.0996 K( _) {' z. W' C+ T
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: U, O% E [6 K2 `0 T;; and initialize the traffic lights to one setting$ z2 U( E% B& Y- a M$ i8 P. t
to setup-patches
" e8 k7 R/ x$ b$ Q0 @6 F ;; initialize the patch-owned variables and color the patches to a base-color7 }! R: q _3 T$ J/ B" _8 @
ask patches
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% H% W% I7 f" x- \7 P set intersection? false; x" Q- h* K, _8 v9 \
set auto? false2 z4 }6 h8 Y/ ^( i/ N" X: |- a
set green-light-up? true
+ z+ _& ^' N# |" ~: `) {- ^' G set my-row -1* w, A% X5 @0 n; l
set my-column -1
7 N3 H5 j- j7 ^1 }6 M set my-phase -16 k3 j7 u0 u3 ^* [) ^
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
9 n! g7 R! k0 `5 o set roads patches with
" _3 ~! d% q6 `6 n [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 I! G" m, g' a! O7 P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 {, L; B7 K; ?3 H% ~ ?5 w; Q0 [7 ^ set intersections roads with
, i0 T: z6 N+ W; b7 r# d* u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 O8 |% u2 v- K2 h+ } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! A; X- n6 Z [% d" Z" G; g) I4 e
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ask roads [ set pcolor white ]
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end
. {2 T4 s, C B9 u _3 t G6 T其中定义道路的句子,如下所示,是什么意思啊?
' y( b8 h2 A' `3 {2 d7 ] set roads patches with
: D4 ?! l, D& k w# f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% k0 I0 u% s/ T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' d4 p; m8 {0 Q! p0 T8 @9 @$ S2 p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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