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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。! h1 u0 ^1 b, K0 A y3 A/ d
netlogo自带的social science--traffic grid这一例子当中,
) ?: ?: f# }, R5 @- R! wglobals/ l1 V2 t, F) }6 k* Z6 h7 F: i
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grid-x-inc ;; the amount of patches in between two roads in the x direction9 Q/ m2 h. M/ }' B2 {
grid-y-inc ;; the amount of patches in between two roads in the y direction# I2 V* Q2 |( t: o6 x6 z* y: B
acceleration ;; the constant that controls how much a car speeds up or slows down by if
2 v1 i, Z9 T) |& ? U/ o ;; it is to accelerate or decelerate% r$ k7 d' ~2 ~/ E
phase ;; keeps track of the phase
! u' |9 _/ X" [0 j num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure/ \( \0 V6 Z- g. W2 h2 X
current-light ;; the currently selected light
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- F* ?. Q# ?: w' I ;; patch agentsets( G6 ~; c2 o* [
intersections ;; agentset containing the patches that are intersections
, C9 e9 q/ {: ~- h Q roads ;; agentset containing the patches that are roads% N9 {1 \6 |$ @
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7 q3 k# J9 ~+ H/ Bturtles-own [8 C; }' A; i: J& L. t5 b5 t( o
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speed ;; the speed of the turtle
# ?% F& o, l9 I* v5 o1 d up-car? ;; true if the turtle moves downwards and false if it moves to the right
$ x1 z% a1 J3 m x4 ]# U wait-time ;; the amount of time since the last time a turtle has moved6 a. w! i+ L K1 d* u" q
]
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patches-own5 J7 e% l4 ^6 X3 D G" L% j
[
* a ~* {/ G& V0 Y3 Z8 t) H0 x intersection? ;; true if the patch is at the intersection of two roads
0 h: t. g, S% t) a# ?" w, F! l9 ]5 g! V7 u green-light-up? ;; true if the green light is above the intersection. otherwise, false.8 \$ z' F1 c, \, [. l! N7 ~$ r
;; false for a non-intersection patches.+ P: k! I l' }8 @9 ]
my-row ;; the row of the intersection counting from the upper left corner of the
/ W; w0 H; s9 F! ~! R: \( k9 _3 ? ;; world. -1 for non-intersection patches.
! K3 h- T$ @8 i- v6 n5 r my-column ;; the column of the intersection counting from the upper left corner of the
, \% o4 T, v0 ]' k0 H ;; world. -1 for non-intersection patches.
4 L7 k; p& W& }8 v5 ? my-phase ;; the phase for the intersection. -1 for non-intersection patches.
6 z8 {; v O7 A& S) y: \ auto? ;; whether or not this intersection will switch automatically.
U: o# n# w3 `# W& n2 Q4 t) p ;; false for non-intersection patches.- |- q) U! c: ?, t2 Z0 a8 f' H& i( `
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;;;;;;;;;;;;;;;;;;;;;;
' X- k( P# d3 A9 V, U! E/ ~' X;; Setup Procedures ;;0 C! i% K6 |& A' n$ o7 x2 X
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
7 a2 D/ K# O' n9 S$ a4 p6 R;; Create num-cars of turtles if there are enough road patches for one turtle to# F. o) }# V- _: _& D2 M
;; be created per road patch. Set up the plots.
7 q, g: z* {. n: o) |( Tto setup
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setup-globals% ?) T/ Z& u ~" `/ J y" a, n% I; i
1 B5 f- A s' f Q( B ;; First we ask the patches to draw themselves and set up a few variables
5 M5 |$ Y, j$ r3 L1 O/ x setup-patches( l3 h& l U8 a5 u6 t7 [* p
make-current one-of intersections" a; s4 X9 e+ A" Y# k
label-current5 j, O2 T1 r( a
: L: h. [$ u0 H! G: Y set-default-shape turtles "car"+ u2 `( B6 V5 f% L( `2 `, [" I
( V4 P4 m. d- ~. E1 s9 k( d1 ~ if (num-cars > count roads)+ x: l# c+ {8 ]; a' v+ L
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user-message (word "There are too many cars for the amount of "( K+ _% s# n% \& W$ V9 v0 Q2 o
"road. Either increase the amount of roads "5 D. }. U) ~8 w0 x6 T6 W; m
"by increasing the GRID-SIZE-X or "$ X3 N. F8 g+ [8 o
"GRID-SIZE-Y sliders, or decrease the "' P4 A! A& ?9 U- y! x8 t7 {. k2 l
"number of cars by lowering the NUMBER slider.\n"$ e& V; v3 v6 o
"The setup has stopped.")
6 D7 \ H9 G/ V3 S; u# q stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ B: H4 d! }" L4 e3 M- ~: m
crt num-cars
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setup-cars
# U1 P1 r7 t7 i& w set-car-color5 R6 h2 W `: A' E8 `
record-data
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;; give the turtles an initial speed- r( {; Y3 Y5 @0 I0 f
ask turtles [ set-car-speed ]
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3 |* G$ o6 H$ w; y/ l" M reset-ticks# q- r ]% ]0 A! t
end' _+ M( q2 h5 L2 m" J% R& H7 J. j3 z# i
8 h0 n, a! k) v" Z; [$ f;; Initialize the global variables to appropriate values- }4 X" D G# W% f0 }2 P
to setup-globals
/ F( \; U/ t6 j7 M8 {3 Q set current-light nobody ;; just for now, since there are no lights yet8 X0 R0 z" r6 I) r) i* x/ v
set phase 0
4 d) m6 ^" U2 E' o+ m6 x) \ set num-cars-stopped 0
0 m6 ]8 m% y8 d w' t set grid-x-inc world-width / grid-size-x
0 I( j% M! a, [8 u1 g% D( S7 [ set grid-y-inc world-height / grid-size-y
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+ C2 y& A# A) m$ w5 g% K ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& _4 N% e$ Z, [ Y" q/ U7 N set acceleration 0.099
7 M/ N# Y9 r) F5 send
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 W, E/ m; X% u
;; and initialize the traffic lights to one setting8 r+ A7 o6 `# ^, X" h1 I: r& u
to setup-patches
( w" f5 ^1 Z5 f# s$ o9 ~) M ;; initialize the patch-owned variables and color the patches to a base-color3 m( f2 B7 J T: W
ask patches
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, |4 F) I/ q m set intersection? false, h& N2 u# r9 q1 V. j; T' @
set auto? false' [' I3 `" D/ ?% }
set green-light-up? true( B) \4 F3 x& \" Z2 g4 {
set my-row -1
6 g* V' g; O' G' F: p set my-column -1
1 e9 M5 t1 J4 Q set my-phase -1
6 }% a' }( F" @ set pcolor brown + 39 M8 b- Q) H2 D7 z
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N) r, F6 j q0 t7 G; g: {0 g; H& O ;; initialize the global variables that hold patch agentsets
J3 v' W8 S5 Y+ h) X set roads patches with
0 I- _% {& ^+ f6 x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' d2 ~+ }+ x7 E6 w% \( ?
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# X! u) d7 {0 a/ T! [" u
set intersections roads with
$ B0 d7 `% t' z: S! A' | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ P5 x% _2 Y0 r) f+ Q7 U7 n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]7 V/ N, m' J9 U3 K7 Y
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?3 ^0 G0 L; | I9 E( T8 M
set roads patches with: Z) U3 Z; N5 R
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 a7 y, U. N/ K% R$ J) Y( }. u
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: K5 ~# J, t6 k2 [# W8 A2 I, c; S4 c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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