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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。
* h: g# Q# H" M9 Knetlogo自带的social science--traffic grid这一例子当中,
; o3 [% [& k" Kglobals
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; @/ P4 w2 M4 x: s: q0 _ grid-x-inc ;; the amount of patches in between two roads in the x direction
@' }; H3 T2 B7 u2 a grid-y-inc ;; the amount of patches in between two roads in the y direction( B4 k! f' W d6 [
acceleration ;; the constant that controls how much a car speeds up or slows down by if8 v, x# Y5 ?# R7 u5 _9 Q" |9 n
;; it is to accelerate or decelerate( P5 k5 K4 a( {* P5 x Y
phase ;; keeps track of the phase& l: j4 t2 i9 s+ V! r A
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
( C: J; n# r4 Q% T" |" j2 e current-light ;; the currently selected light
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;; patch agentsets
9 p7 U4 R% `1 I g" p- K$ [ intersections ;; agentset containing the patches that are intersections' j8 G- A2 t3 W3 q: O- B
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
6 R% E6 i& C' c up-car? ;; true if the turtle moves downwards and false if it moves to the right, S# y0 Z% H$ H
wait-time ;; the amount of time since the last time a turtle has moved- b% O# N1 v" i& l2 ]$ {
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patches-own! Q, G3 k' h( U' f; y$ c; i7 L! q
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intersection? ;; true if the patch is at the intersection of two roads
% O6 \. P3 k7 s! [& f green-light-up? ;; true if the green light is above the intersection. otherwise, false.' b0 T. N+ d+ C8 y4 q% E
;; false for a non-intersection patches.' y$ @% B( z' {
my-row ;; the row of the intersection counting from the upper left corner of the+ y- m1 V4 @! o' C. W& d' c' M0 ~% i
;; world. -1 for non-intersection patches., a- z& ^ j) Y' ^
my-column ;; the column of the intersection counting from the upper left corner of the
( a' }* T) [% h- P; u/ l ;; world. -1 for non-intersection patches.
; W2 F7 Y. Y6 k, S9 E$ U' m my-phase ;; the phase for the intersection. -1 for non-intersection patches.
5 ]6 q t8 m3 D6 C6 X1 S auto? ;; whether or not this intersection will switch automatically.
+ H1 R# x" `6 y: h ;; false for non-intersection patches.
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5 U ?5 [1 }6 S/ c! s0 y8 d% _;;;;;;;;;;;;;;;;;;;;;;
$ X! u4 h3 m% ?;; Setup Procedures ;;# c- R7 q: e) [% t0 b' d, z* z& x
;;;;;;;;;;;;;;;;;;;;;;
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5 y4 a; s5 t6 F;; Initialize the display by giving the global and patch variables initial values.7 P! y. J! [$ Q" Y
;; Create num-cars of turtles if there are enough road patches for one turtle to+ f( I" q/ G0 j
;; be created per road patch. Set up the plots.
& A: m6 J# B5 ]. x- U+ a; |5 s$ B, mto setup" A, c" E1 K6 A, J/ ?* X2 z
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setup-globals4 B1 b& @$ b6 k3 [0 r1 g
O4 i$ Q5 G: O" G ;; First we ask the patches to draw themselves and set up a few variables! J8 b; y9 d( m) z
setup-patches
- A0 u6 m2 e" g# j6 P: l# M make-current one-of intersections
0 f/ i! D9 F! L- P* I& k label-current
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- O2 `; Z. n0 @9 E0 S- l% y# T set-default-shape turtles "car"8 @* y f! M% Q, [4 s; \
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if (num-cars > count roads)8 Q/ E6 w2 Q% S% m
[
* @& d- a5 ^( ? user-message (word "There are too many cars for the amount of "6 a- z6 P5 C4 x# c: Z( ~
"road. Either increase the amount of roads "7 ~- `. d; B9 ?
"by increasing the GRID-SIZE-X or "3 k4 P- D- j$ [1 M% t6 I( [
"GRID-SIZE-Y sliders, or decrease the "8 `* s3 f" O; W2 t: l
"number of cars by lowering the NUMBER slider.\n"
! T [3 h ~) N2 Z' u- | "The setup has stopped."). S2 F0 n& g& B( r
stop4 H/ I, R5 a" ^, J
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
x6 v. X1 o2 f$ q! c) V crt num-cars5 c3 ~6 M3 p. s2 x7 C
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setup-cars: C: l9 ] A5 l! G& H M$ D2 K
set-car-color" q+ ]& ^! k% k7 T5 S
record-data) W# }$ e/ K; @& q
]
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;; give the turtles an initial speed9 J, Q9 O8 a; i# ]' {
ask turtles [ set-car-speed ]
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3 C& K! G3 T2 Y; O$ S5 }2 E1 K reset-ticks
5 P, ~) e m' B" [- o* a9 }6 uend) J7 y& R$ z! C5 U4 Z. M5 S5 O
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;; Initialize the global variables to appropriate values
W+ B4 C* x0 L: d; I9 c7 r* Hto setup-globals
% l0 {8 g/ e/ d- E; g; } set current-light nobody ;; just for now, since there are no lights yet
7 |/ ^8 p1 I" [' R" ` set phase 0: ^& Y. R- R" R
set num-cars-stopped 0
/ T- F5 \& C/ @. z set grid-x-inc world-width / grid-size-x
; D3 D9 t7 q; x5 o4 i set grid-y-inc world-height / grid-size-y0 q7 H7 q8 V/ m" I [, ~; n& T
8 A$ _% p) U- a* L ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary! U7 M3 _8 q* O* f' c% v
set acceleration 0.099
& j& A) ]! V4 Z. S) `" aend
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" M) Y4 R: Y) t4 E/ d;; Make the patches have appropriate colors, set up the roads and intersections agentsets, X$ E! P# P3 d5 H$ }6 E- b
;; and initialize the traffic lights to one setting
/ {* p' D% v0 ]" Kto setup-patches# q$ I/ w2 n2 o1 L) E6 U( o
;; initialize the patch-owned variables and color the patches to a base-color/ E8 ^% O- @0 X0 J) t4 K
ask patches
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set intersection? false( h+ P( l5 m3 X/ X! y- v h: b% Z
set auto? false7 g* C; t1 k! i3 |) O1 t2 P" x
set green-light-up? true
, E8 x* J+ d) ]# s4 q set my-row -1* a& f4 F6 C+ V2 \9 _3 M
set my-column -1
O; ^: e. |+ C6 D a \ set my-phase -1/ e6 f8 W5 |/ V- M% f l2 r9 a
set pcolor brown + 3
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% M: [* A% D( {# P ;; initialize the global variables that hold patch agentsets
# b0 N0 W5 y* o2 a& d1 \ set roads patches with
3 c" U6 `/ a$ E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 J! f+ r5 k) ^0 M8 R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ D/ C9 o; d$ m2 \ set intersections roads with
2 Z E6 {' i9 {1 R* r5 Y; g& l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and5 u3 g8 I" L( G" p' |* v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ G& t5 P) M2 C
- Z" D6 _ z0 f6 Q' x ask roads [ set pcolor white ]
2 P6 ~( M. N8 Q) f! s# @$ ~/ v! X setup-intersections ?/ A% P6 o' f! k; D7 a
end
+ Y* x% R3 ]2 `0 V( R7 W其中定义道路的句子,如下所示,是什么意思啊?8 J5 `) w! D( m" q
set roads patches with
5 D3 B6 w! @) l* G+ p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' N' w0 c( g& @8 A0 \0 W; F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- z' h: I: R7 g4 S5 N( w* o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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