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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。
% m7 x. G3 C5 r# R R8 [" F& unetlogo自带的social science--traffic grid这一例子当中,
5 r, ?7 b3 [: X! Y0 a$ K0 w* sglobals4 p3 H- f2 Q( f- k$ `! ~3 a5 ` X( q
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2 x$ q: p& \# G$ a, G grid-x-inc ;; the amount of patches in between two roads in the x direction' D2 W: l$ t3 ^
grid-y-inc ;; the amount of patches in between two roads in the y direction
0 k1 j8 @8 P# `0 C& z* U |+ W+ X acceleration ;; the constant that controls how much a car speeds up or slows down by if
0 q/ w3 ^7 H5 x0 q4 m4 r ;; it is to accelerate or decelerate
) s' {& ~( y% {0 R7 b phase ;; keeps track of the phase
1 Q0 W$ M6 f$ O# P; G num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure* W+ i A7 a9 w( {; E- }
current-light ;; the currently selected light
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4 p/ }4 L) u! m8 A- x- l/ i ;; patch agentsets6 M( T# h( d6 p) J. D4 H. B
intersections ;; agentset containing the patches that are intersections
+ n/ j8 F* U" f8 D roads ;; agentset containing the patches that are roads
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2 A: t: c6 q- V8 L9 Eturtles-own' P# X. L; _% Z/ R
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( _. q3 r4 E+ g! v speed ;; the speed of the turtle; M7 G4 E ~1 a0 f: d# `5 U" X/ b
up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ ^* N' y5 y8 W8 K) x wait-time ;; the amount of time since the last time a turtle has moved
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3 ~. ~% ~0 ?5 e7 c9 @patches-own
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% n c( U/ y( H5 X6 N) Q intersection? ;; true if the patch is at the intersection of two roads
; {" }4 k6 W; q( N6 E green-light-up? ;; true if the green light is above the intersection. otherwise, false.6 _/ a3 x: E) R
;; false for a non-intersection patches.
7 ~5 J2 s, z i {* v( U' | my-row ;; the row of the intersection counting from the upper left corner of the
, U+ A* m# g, V ]0 \+ p$ A ;; world. -1 for non-intersection patches. B Z- ^9 A3 I5 l M
my-column ;; the column of the intersection counting from the upper left corner of the. ~& c/ j) G. d+ a$ z5 Z
;; world. -1 for non-intersection patches.& _. U) y2 E0 Q" h' Q
my-phase ;; the phase for the intersection. -1 for non-intersection patches.- R& T9 B6 s( e/ t% x! F
auto? ;; whether or not this intersection will switch automatically.
: G# n8 k4 ^, r: `. u ;; false for non-intersection patches.
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" y$ g& A* D$ D* p( H! O6 h! q;;;;;;;;;;;;;;;;;;;;;;5 K/ P# D/ J0 E; l2 @7 F
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.1 d$ A. W9 f4 x
;; Create num-cars of turtles if there are enough road patches for one turtle to w' Y+ a1 `0 ^, b4 P v8 V
;; be created per road patch. Set up the plots.6 T1 I* V' P" W2 z( v) y8 d3 v
to setup: H9 C3 ]; c0 d6 J
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setup-globals
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! R! u$ |8 h) A ;; First we ask the patches to draw themselves and set up a few variables
5 q9 i0 a6 }/ d% r4 m setup-patches4 v. B: W: a& F& Y" b* q
make-current one-of intersections1 i- T2 u$ ~6 e/ O5 U- S
label-current$ m" J( @6 Q# B# F4 r6 O
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set-default-shape turtles "car"
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, J+ A! d5 h* u1 X, \. [ if (num-cars > count roads)8 `/ g, n6 s% ]: b4 K0 w
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: d( o, m) ]: G+ `, k \ user-message (word "There are too many cars for the amount of ", i1 R% [5 A3 _7 J% n
"road. Either increase the amount of roads "
% r# P( R/ U4 ]; t* _ "by increasing the GRID-SIZE-X or "
# W9 e( @7 B1 n% h) J4 o" X$ N "GRID-SIZE-Y sliders, or decrease the " w2 G U7 e2 N8 N* V
"number of cars by lowering the NUMBER slider.\n"
E# [& o! J% s "The setup has stopped.")% Z# P6 T: W0 t; L7 o2 |1 G- G
stop
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' h4 |! Y" U d) Q$ x ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 p8 {( \8 L% B3 q$ o3 T; o* y
crt num-cars
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setup-cars
1 @ F- C5 }. X- |7 {7 ` set-car-color
; C$ E L1 |# j- T3 l record-data
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;; give the turtles an initial speed# R6 U7 w. @- e5 Z) ^+ ]* F9 B
ask turtles [ set-car-speed ]9 s3 }7 {9 E) F
6 I4 p, j* L5 x. s8 K$ I reset-ticks2 K8 _3 L: Y, Z6 A- H& S
end
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8 ?% U8 C- M1 |/ ?. Q;; Initialize the global variables to appropriate values
9 l* H1 \9 I: B6 e. ~1 G( M+ y4 F% Oto setup-globals
, W' l' V+ `6 [% R set current-light nobody ;; just for now, since there are no lights yet0 E* I% g2 O5 ` \* ~. a$ L
set phase 0
g6 {7 m6 n2 M4 Y4 A8 _- m set num-cars-stopped 0
% W6 S+ U7 [( ?; Q set grid-x-inc world-width / grid-size-x
5 s2 O* V; S$ X5 K2 l set grid-y-inc world-height / grid-size-y
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/ h! ~ V# ~9 L6 t9 Z0 | ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 a: q( B4 t7 r0 \3 ]
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* Z7 N' @2 l1 @& h;; and initialize the traffic lights to one setting
2 G4 T4 h1 {% k) F: z9 t* v. wto setup-patches8 @8 k" h( G0 j9 t, G4 g
;; initialize the patch-owned variables and color the patches to a base-color# K: J7 {/ @ S7 z1 k8 G+ v5 c
ask patches
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& K1 P( e" b0 {/ V set intersection? false: ^4 B, {! [7 D9 h+ z* q; L
set auto? false8 B4 P" L" J( u/ c
set green-light-up? true
5 ^% y: u! t5 K set my-row -1% ^: d3 D+ o2 }& `: _7 _" H8 S
set my-column -1
" q. q8 ^4 K+ s; V" r' t, J set my-phase -17 o2 \8 P" s! e$ Y
set pcolor brown + 3
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/ b- p8 b2 O6 j4 O* A ;; initialize the global variables that hold patch agentsets. \" m) d: _/ S- Y$ ?, M9 I( w# D
set roads patches with
% l2 `$ Y3 |) V [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# M2 U6 h& B* Y; {/ Y. N. F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 t9 {" G* ~( ]4 I G2 t3 F set intersections roads with3 _9 L" u, t) k0 H( E
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ Y' b6 C* n. b; H$ ~8 M5 S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ k4 q6 S$ M. r' h/ i2 E4 ?
1 p, \1 ] R% _: e0 I ask roads [ set pcolor white ]9 I: S" c% f/ H2 K @
setup-intersections4 X/ r+ y0 u1 S! ?6 J
end8 {' { [3 ]4 M/ v2 Y/ {) F
其中定义道路的句子,如下所示,是什么意思啊?1 L( N) \9 }2 Q2 e( T1 c, b/ _6 l7 D
set roads patches with3 _& i9 p; h6 {- p+ y$ g
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 n5 U9 C! T0 O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* H) L2 ]5 K0 Y! \- x1 z2 q; Y$ k1 A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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