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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。
9 I, m' \4 a* b! w# _2 r2 Lnetlogo自带的social science--traffic grid这一例子当中,+ L2 f% w* A; o8 D4 W1 d9 N
globals7 ]9 d2 L* u. f3 M0 l8 n
[
( H( G q9 [9 ? j, X" v grid-x-inc ;; the amount of patches in between two roads in the x direction# q7 _' O0 M% n A: F& q
grid-y-inc ;; the amount of patches in between two roads in the y direction7 {. y" l. W( j
acceleration ;; the constant that controls how much a car speeds up or slows down by if* g" ?. Y/ V: a9 T- Y
;; it is to accelerate or decelerate
$ h* `" k: g m l phase ;; keeps track of the phase. c7 I+ ]1 q; Y3 T! Y( j
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
3 K+ d3 n4 K5 Y current-light ;; the currently selected light
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;; patch agentsets# v1 U% }$ [. p; i- Q
intersections ;; agentset containing the patches that are intersections
# V, O4 m9 d9 W roads ;; agentset containing the patches that are roads- P! M P' Q0 g W) K4 O" y
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3 |2 i# ^, T, t! _turtles-own
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speed ;; the speed of the turtle: o% H' }. o3 @2 X, f. j! b6 p
up-car? ;; true if the turtle moves downwards and false if it moves to the right$ h! @8 M& o* o0 O
wait-time ;; the amount of time since the last time a turtle has moved
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. A6 i1 v7 ~" Z D: ?patches-own' J2 R/ c4 R1 Q
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intersection? ;; true if the patch is at the intersection of two roads
1 Z/ ], J! S; E" H green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 h1 ?- {& r4 } ;; false for a non-intersection patches.; v }0 y" w" z- ~! i0 [- }5 M7 l4 h
my-row ;; the row of the intersection counting from the upper left corner of the6 q- |- Q9 c- _
;; world. -1 for non-intersection patches.8 B# F3 l @, c. E
my-column ;; the column of the intersection counting from the upper left corner of the' R! H6 l0 Y6 M
;; world. -1 for non-intersection patches.& n6 J& ?8 }5 c' S8 \" G
my-phase ;; the phase for the intersection. -1 for non-intersection patches.+ L& L: ~+ q! s2 y1 E& q
auto? ;; whether or not this intersection will switch automatically.9 J$ O# U4 ?7 x) E
;; false for non-intersection patches.. X$ W; n9 q8 i+ C# f9 A, c
]
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! [2 c& N( @ S4 A `. w;;;;;;;;;;;;;;;;;;;;;;
4 {6 S. U' r. d2 I;; Setup Procedures ;;8 |: z% {" ]$ Y- t/ ?
;;;;;;;;;;;;;;;;;;;;;;5 T# f% n9 x8 c7 P. R( }/ p
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;; Initialize the display by giving the global and patch variables initial values.0 O+ a! }# y* w7 w" f! i) ~
;; Create num-cars of turtles if there are enough road patches for one turtle to" s) x' K2 _6 Q/ P0 T
;; be created per road patch. Set up the plots.3 G/ X) v6 S* L
to setup
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9 d! t% C% W9 z* M setup-globals8 P6 n* q" T/ ~
, W% L& ]+ m% I ;; First we ask the patches to draw themselves and set up a few variables" j* [/ S' m0 E7 L' g$ q
setup-patches- T& J7 m D/ j) O7 ]7 A! ?2 d4 t
make-current one-of intersections! E: o* Z3 `$ t8 P. o
label-current9 _. v# \" F3 B9 j3 w
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set-default-shape turtles "car"5 q& b8 W9 m8 T" W
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if (num-cars > count roads)$ V: p `# b. I
[
) ~: O9 o& t; o1 ]/ O. E, c user-message (word "There are too many cars for the amount of "
: w+ c: Y w: k "road. Either increase the amount of roads "
" e( x: v$ N* N4 v: b$ d9 b3 Y "by increasing the GRID-SIZE-X or "' @; w$ t' t5 N& M H2 P
"GRID-SIZE-Y sliders, or decrease the "3 z3 N" O6 D `; I$ h3 N) l- [
"number of cars by lowering the NUMBER slider.\n"
7 m# M8 l3 u% H) z# H9 Q "The setup has stopped.")
- t/ w" h/ d& X& g/ x3 P. q5 p- t) {1 i stop
9 k, s/ C0 p, ^4 U ]
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# H9 M! k5 t9 ` ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- v& e; K1 ]7 p) H$ v( C | crt num-cars9 I! r5 q8 W1 m* i0 w; v: o& V
[. T" h) L X! c2 q5 a) Q! t
setup-cars
. K" J' \2 J( [$ ?3 e) p set-car-color
$ {5 i2 u' {& O' T: u& Z! J record-data D5 Y" I- X3 S8 ?# y
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. k9 [* m, Z: h+ u- s) C ;; give the turtles an initial speed
3 r( z0 H- |+ {! V2 ]2 R0 U* Q ask turtles [ set-car-speed ]9 b& F: _+ c. J. v$ y# Y
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reset-ticks" r- g" H/ g7 `8 n B
end
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" X2 h, e; F, n6 @2 G4 O;; Initialize the global variables to appropriate values
2 v( X3 P9 ^) |8 Y9 xto setup-globals
" L3 i/ ?2 P+ T& M4 f8 { set current-light nobody ;; just for now, since there are no lights yet
- ~% Q) v1 M2 c& X+ `) X set phase 00 t* e. W% k- r2 {
set num-cars-stopped 0
# X( F: W# H, t' O2 j7 g set grid-x-inc world-width / grid-size-x
& S& H2 D: ~1 { set grid-y-inc world-height / grid-size-y3 W( M5 Y' w. `0 e; z
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ F3 u M# m& P# G) k: i3 X
set acceleration 0.099& k4 Z' Q) H4 @& f a/ @' _6 [
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 `2 X- i: v: h) o& m5 A
;; and initialize the traffic lights to one setting$ }* y- a5 i o
to setup-patches6 B; Z) x+ w: M2 O" w
;; initialize the patch-owned variables and color the patches to a base-color
O; L7 r: G" H4 F/ k ask patches
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set intersection? false
) ^7 k1 g$ r$ P6 [0 ^ set auto? false
0 J, t: B8 h6 j$ S: k5 x/ I8 ] set green-light-up? true0 B, \# v2 m7 o: |& i
set my-row -12 ?5 T# O9 v+ X- n; I
set my-column -1
- K, C" N, p* x, h" G4 M+ n; J, @ set my-phase -1
9 ]8 i, {( ]: o+ J3 w0 g' V set pcolor brown + 3, ]2 j2 U+ E+ P
]7 p; s* L( K5 z/ u2 E
+ p: p; m+ [7 w, C9 m6 l ;; initialize the global variables that hold patch agentsets
0 J/ O$ D9 X' m- B: `9 C: K set roads patches with8 `/ }4 o2 }2 w v; D0 ?
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ o, Q$ o( g9 ]- l; z0 v" j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( a" q4 h* a1 E8 n
set intersections roads with
7 U8 x ^) I G# Q7 n [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ l. n7 ?3 U; m! u F: ]5 s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
7 C3 o7 R4 g9 f setup-intersections
+ o; U0 w' R# p+ Q' N& @/ nend
; F. [6 I0 x+ }4 n: V其中定义道路的句子,如下所示,是什么意思啊?
. B% e8 R" d% D3 V set roads patches with
) @9 V: c2 C! q7 t/ U, }- t& J- h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( {' d: A* q1 W2 w: B5 ?
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]' O# s- q# q2 S
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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