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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。
/ ]0 w! c( L( t' znetlogo自带的social science--traffic grid这一例子当中,- }. o& Y4 t4 J& M) G
globals- q* H. Z b4 }3 d+ t
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) ?( j: Q& X v9 p grid-x-inc ;; the amount of patches in between two roads in the x direction4 W1 k: C& L$ m0 a1 d8 B
grid-y-inc ;; the amount of patches in between two roads in the y direction* T2 B' X$ {; {
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 o7 k; e' W0 v$ i ;; it is to accelerate or decelerate
$ C X7 A5 o& k( L1 n phase ;; keeps track of the phase# c* P$ u& S" U# o: d# A. j
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& `6 |# Z$ J' W7 B: W: R
current-light ;; the currently selected light3 u0 f7 l; x u* R# z0 ?& q
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;; patch agentsets! I8 c9 a: U2 [: S) q# z
intersections ;; agentset containing the patches that are intersections
. m1 }! h! z% s: m! w roads ;; agentset containing the patches that are roads& [0 k" | v- F2 f
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' y+ A) v3 B+ c, D+ k8 z6 Bturtles-own* a- `6 o6 O: ~0 ?: f9 G
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speed ;; the speed of the turtle
. |3 J" S/ c: |3 G" i: f. x up-car? ;; true if the turtle moves downwards and false if it moves to the right
' T: W: q- o4 A8 u4 o4 u q wait-time ;; the amount of time since the last time a turtle has moved3 G& J* n* ^: t# B) Y
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5 p: [& K, b, n7 C8 K! T5 ypatches-own
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intersection? ;; true if the patch is at the intersection of two roads
+ h9 h+ i- c$ R x& S green-light-up? ;; true if the green light is above the intersection. otherwise, false.( t. N& D/ C/ [6 X: a5 D
;; false for a non-intersection patches.
' s. Z4 e' S0 E$ Q/ ]% \ my-row ;; the row of the intersection counting from the upper left corner of the' z( @: R9 |( A- p; k
;; world. -1 for non-intersection patches.
% s6 m) V3 u; i# S7 O my-column ;; the column of the intersection counting from the upper left corner of the( A( s- N2 b' l `# `6 {
;; world. -1 for non-intersection patches.
) ~: l3 ^& z$ Q1 B my-phase ;; the phase for the intersection. -1 for non-intersection patches.) P+ W( d- h( }8 ^( x; u
auto? ;; whether or not this intersection will switch automatically.
: y: o, P3 ?) ?$ U/ p ;; false for non-intersection patches.5 [$ I8 Q7 @! \
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7 |/ q5 Q2 L# k+ F' F7 Y' i;;;;;;;;;;;;;;;;;;;;;;% S) u) I) x' v8 p7 Q0 G4 f2 e
;; Setup Procedures ;; h/ Q2 S6 K7 u
;;;;;;;;;;;;;;;;;;;;;;
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3 t6 w7 h3 G) h;; Initialize the display by giving the global and patch variables initial values.
; L9 @. L) Q3 O- V0 I;; Create num-cars of turtles if there are enough road patches for one turtle to0 i% x5 l9 w4 y7 [5 \! p7 n# q& L+ U! \
;; be created per road patch. Set up the plots.0 h% u# t! b! C' a! m
to setup
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setup-globals
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6 n$ K7 o6 g, h5 X- K, p+ c ;; First we ask the patches to draw themselves and set up a few variables
, I) h' W' [# ^2 n/ h setup-patches6 s* I* f) d. o, ]
make-current one-of intersections* l- k; W$ o/ f5 P1 ~! X: I- u/ V
label-current
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' K5 w" y' P; P- G- h) z: `3 ^1 k set-default-shape turtles "car"& V% z* k& d9 t0 y
" d0 V* r% j, ^4 p1 F if (num-cars > count roads)+ d; f% L5 K1 |6 U
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user-message (word "There are too many cars for the amount of "# A' n$ ]7 V6 v) a9 F" O
"road. Either increase the amount of roads "
0 Q8 o& e+ d4 O) i. @ "by increasing the GRID-SIZE-X or "
3 p) Z( E1 x. L9 c "GRID-SIZE-Y sliders, or decrease the "
0 _ K# x: k. `( w+ G "number of cars by lowering the NUMBER slider.\n"
2 @0 l) f- D3 T2 J' v2 y+ S "The setup has stopped.")( d4 D2 d4 y5 H2 B, _! g9 {6 D" U! R
stop
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! C- I3 T9 R- y2 R( e7 v ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% O8 a1 E8 M% j1 l
crt num-cars z. z2 H& k7 v1 [% B' v, w0 ^! z5 v
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setup-cars: b5 V. \, [/ V7 e, t/ K, R4 z% x
set-car-color
1 L6 g* p+ s8 M record-data
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;; give the turtles an initial speed
: r! V& e: H) c9 s9 G# r ask turtles [ set-car-speed ]) j5 W( m: m: N" N. Y* l
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reset-ticks+ d+ G. W7 B1 _
end
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4 [- Q7 y; N4 Q# e6 v2 O;; Initialize the global variables to appropriate values
; d6 w2 t2 G5 J) t/ b1 T; v- mto setup-globals
7 l' V8 C( l* S9 W9 b% d set current-light nobody ;; just for now, since there are no lights yet0 p9 }% {- B. S7 `% X% r, f# B5 v
set phase 02 Q$ o6 F6 M( E3 z, J5 h) C: m
set num-cars-stopped 0
" H0 e2 m5 A5 r4 [: n4 u1 w( H set grid-x-inc world-width / grid-size-x7 ]) A* ]/ M' P4 O7 b. s
set grid-y-inc world-height / grid-size-y
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; T2 P b! _' { ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 e7 w! ]- Y2 i% F$ c
set acceleration 0.099
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, ]& v# k+ u; o% d5 b3 T8 D;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# q9 s( Y/ j+ k. u% v5 }
;; and initialize the traffic lights to one setting2 \4 o5 t; \0 b0 [3 W8 g
to setup-patches3 J* M" a0 |8 K$ O7 r
;; initialize the patch-owned variables and color the patches to a base-color& g- m# p( C% n+ U5 k# b
ask patches
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1 [+ Z' i" u" R set intersection? false0 M* v' p* ?4 ]- P& B$ `/ k
set auto? false
! a+ A) n. c$ D set green-light-up? true! c' B Q: }" y' I8 Z! r
set my-row -1
& w% |3 M% ^, V3 o set my-column -1
% G/ k$ x$ J6 M8 a. ~% A. |+ i set my-phase -1) Z4 P2 S8 _+ k( t% n4 S+ x7 I
set pcolor brown + 3. Z3 N0 G/ [* z# I* D
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9 E' O8 i# e8 }* S. J9 Z+ p( m ;; initialize the global variables that hold patch agentsets; d6 w: o' m" w7 S# d
set roads patches with
; n( {5 a6 n# e# P% o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 s/ b# @; k) u/ n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 f, h+ F" I8 }' G# o8 }
set intersections roads with
, K- n3 Q$ c# b8 V2 ?; B9 J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) k+ j" u6 W* v/ z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 o% D+ ~- e/ y6 c1 ]( b
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ask roads [ set pcolor white ]2 G; N* y. w& R
setup-intersections$ S- X2 b, f1 w1 V
end
2 z8 J" j6 a% s其中定义道路的句子,如下所示,是什么意思啊?8 _2 F4 t1 P9 o" C
set roads patches with
8 b! l. U6 ^ n& W. i2 A) |: {9 f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: t5 e( N* F9 S$ B* E3 ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# M8 \- B& C0 P) x
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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