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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。8 A7 A4 E% c1 A% X O4 m% b) }# D
netlogo自带的social science--traffic grid这一例子当中,
/ B( ~- q$ |9 t2 G2 I" E; Wglobals, h- z" s% e! k2 r7 J
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grid-x-inc ;; the amount of patches in between two roads in the x direction
5 T* G3 r" l& \, d: I* T4 l+ Q grid-y-inc ;; the amount of patches in between two roads in the y direction% _. ]. ?' g! l; N
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 g; u* J( B2 [' V9 v ;; it is to accelerate or decelerate
! O/ r4 j) G8 ?* E8 \4 S+ C phase ;; keeps track of the phase
& e% u: ]) [: d0 c) P num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure B! }, u/ N, ^7 O
current-light ;; the currently selected light
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$ X. w; A% X3 a4 p3 ^: J ;; patch agentsets* [3 @% s% B( W8 D+ n- B
intersections ;; agentset containing the patches that are intersections4 Q( I7 q3 P/ E/ M' q
roads ;; agentset containing the patches that are roads
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turtles-own+ t/ I- O9 L# W# l1 s
[
$ y+ D' z& [7 |0 d6 q" a speed ;; the speed of the turtle- C. r3 N8 w* g3 i
up-car? ;; true if the turtle moves downwards and false if it moves to the right
" I- ?: B! L: \ t wait-time ;; the amount of time since the last time a turtle has moved
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9 M: g5 X2 k; U* ppatches-own3 F1 k; x6 x- q8 l
[
5 u) _0 @( h5 ^7 ^( s. l* n intersection? ;; true if the patch is at the intersection of two roads8 s- T; K2 J- m# a# _7 ]
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
# P4 x# l/ o- c) |" D ;; false for a non-intersection patches.5 n% \+ [2 g0 o$ u7 |
my-row ;; the row of the intersection counting from the upper left corner of the6 b1 t! `; q9 z3 \6 j8 D( f! g9 n( I
;; world. -1 for non-intersection patches.
9 h+ r" X W$ L( j; K7 x my-column ;; the column of the intersection counting from the upper left corner of the% }' V* l; {) _5 b& G
;; world. -1 for non-intersection patches.
* }% ?8 `0 @3 {2 E my-phase ;; the phase for the intersection. -1 for non-intersection patches.8 J8 n3 e8 \& X6 N1 ~4 _
auto? ;; whether or not this intersection will switch automatically.
$ b8 U+ K2 X5 F5 H% ?* b ;; false for non-intersection patches.
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) s7 ^, n. z% L1 h2 f;;;;;;;;;;;;;;;;;;;;;;
I- j4 Z1 k( L& V* h;; Setup Procedures ;;; O2 w( F3 Y; g- h0 o7 E& Y: O `
;;;;;;;;;;;;;;;;;;;;;;8 ^2 i+ U8 j5 h5 A
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;; Initialize the display by giving the global and patch variables initial values.0 c8 M) a* \& T5 K
;; Create num-cars of turtles if there are enough road patches for one turtle to. E" b: b+ B/ `) X' z. h
;; be created per road patch. Set up the plots.
3 p) j7 X* t: m0 Xto setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
, L- k& i/ d" @0 D5 l, @: r' G& H setup-patches
. {. h* Y' e! @7 u make-current one-of intersections) U5 G1 \! o% o
label-current
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" y1 ]3 X# T, l! d* u) Q) J( n set-default-shape turtles "car"
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8 o8 Y0 h- B7 N: k Z6 T if (num-cars > count roads)
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" N$ K1 p6 K( {1 H. x# t% m( | user-message (word "There are too many cars for the amount of " R9 N" o! E+ M$ K F
"road. Either increase the amount of roads "
E* }! b$ h$ V0 |- u: @ "by increasing the GRID-SIZE-X or "# [! c3 k& g5 B0 \# v4 `7 L
"GRID-SIZE-Y sliders, or decrease the "
2 o' @$ b& ? m" ]3 e "number of cars by lowering the NUMBER slider.\n"# _) z- j- s: y6 i$ D6 s' `
"The setup has stopped.")# I% R4 y: ^) \: B- Y
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color0 |* i' E4 Q2 l: u2 Z' I( _6 _. t3 u
crt num-cars5 }# r3 s1 ?* ^$ o) y$ U, f. C
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setup-cars
+ A! S- y: i( s& _/ m. ~ set-car-color
8 v: {# M& C& `6 V8 F record-data3 {; j5 w) _$ S1 R' y
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;; give the turtles an initial speed- y. u6 o; a, p# m- {9 u" S \5 @
ask turtles [ set-car-speed ]6 R2 g, |' e( V2 E! g' a+ A
3 y0 \8 ~$ u/ `) I1 g% @/ t! e reset-ticks5 H2 A4 i' d1 {: G# \
end
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/ F5 F; V8 b7 Q! C; j5 ^. D;; Initialize the global variables to appropriate values4 `4 G4 j# p6 I) o t& m
to setup-globals/ F Z }# L9 M
set current-light nobody ;; just for now, since there are no lights yet' H; {/ c1 e. x/ l1 D" z( U7 @4 n
set phase 0
1 K, n M X7 l! e: | set num-cars-stopped 0
4 t2 B4 C: a! s) C4 m3 s set grid-x-inc world-width / grid-size-x
$ J6 w! m9 ?+ D6 K5 a set grid-y-inc world-height / grid-size-y) I" B' f% m: x
3 @8 I) A; h1 w& K ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 X" u' Z3 W/ W set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 Z! C: }1 a- |4 k0 z
;; and initialize the traffic lights to one setting3 N/ w9 B0 u4 x7 K% w
to setup-patches
' ^+ R8 F% V9 N% y, Y: i ;; initialize the patch-owned variables and color the patches to a base-color
4 ~5 W. h' R0 X/ r4 ~5 z* t; O7 S ask patches! T! V% m3 I$ k8 i0 h9 F" n/ @
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U! V- T: R5 F! W3 p4 d8 Z/ y set intersection? false3 Q: U- Q" X; ` a. f
set auto? false8 W7 H* `& r" C1 G9 ~7 m
set green-light-up? true. l+ \% C/ Z+ j" S) F1 k* R" v
set my-row -1
5 i3 e& `/ e1 B$ w p/ n& b" F set my-column -1% `4 T# `8 i" f& D3 ^& ^
set my-phase -1
, c7 I4 }7 a6 H A1 B set pcolor brown + 3* o+ \ Z% t. G2 i
]
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1 d) ~ W- F/ E3 c7 B ;; initialize the global variables that hold patch agentsets
% x+ U1 B6 g _) e0 ^6 [. E set roads patches with/ w& K; h3 \( O6 u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: B: m1 W" V* ]6 [9 H: e X5 J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 P: E6 y$ Y" e, R4 [% {+ K+ [
set intersections roads with0 t$ C$ M4 E4 b4 f! ^6 ]. {* W" W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
X% p2 h+ A/ w" u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
# q+ w" b8 N/ P& ?& U: n7 B* U setup-intersections
v3 P- E$ a! W+ C/ y7 |end
8 R0 C8 |( ]# r其中定义道路的句子,如下所示,是什么意思啊?, ]0 {6 }1 J6 w% g) R% M, }
set roads patches with4 ~4 R' g4 F* _$ R2 J6 T
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ I: c o2 c/ b0 y" ] v, M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 f4 P6 Y i: A3 A; o1 _
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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