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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 d! J; L, u; n: rnetlogo自带的social science--traffic grid这一例子当中,9 k- u0 i" i k- b/ G" m9 ^6 B) P
globals# \2 @5 r" s: h0 ?2 t: Y
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grid-x-inc ;; the amount of patches in between two roads in the x direction/ d3 V, U* k% B. a0 h
grid-y-inc ;; the amount of patches in between two roads in the y direction$ `- C$ T: q: d) p! z
acceleration ;; the constant that controls how much a car speeds up or slows down by if
, B/ Y: g+ E, G& R7 ?3 S5 c( p( H ;; it is to accelerate or decelerate1 L2 V3 C/ q6 S8 F
phase ;; keeps track of the phase
2 s: z2 l* s4 k2 _ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure" ~0 [( r; e- I5 m, \
current-light ;; the currently selected light
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;; patch agentsets8 z$ E2 z5 ?6 K9 W: o l
intersections ;; agentset containing the patches that are intersections
* ~ w# [ A' Z) y0 I& L% G1 M roads ;; agentset containing the patches that are roads
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turtles-own# m$ D2 G) c8 r! r# o. D& v5 z
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speed ;; the speed of the turtle
! V+ ^! g) B6 N. ]1 s( ~* Q) ` up-car? ;; true if the turtle moves downwards and false if it moves to the right+ H3 b8 Z& K; B( g
wait-time ;; the amount of time since the last time a turtle has moved
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7 m- w2 x; T( i$ U/ J/ i5 E$ k$ }patches-own& p1 Q( L. {( [+ ]0 u; G4 M# r0 W
[
7 c, }: r+ R& S4 P intersection? ;; true if the patch is at the intersection of two roads
; \6 Y+ t' p2 Z" y/ a0 L green-light-up? ;; true if the green light is above the intersection. otherwise, false.
# p* J8 O. D9 z. Z ;; false for a non-intersection patches.- g' Z2 c- Z) [5 X
my-row ;; the row of the intersection counting from the upper left corner of the+ Z: s* j7 N( v8 b L8 m
;; world. -1 for non-intersection patches.
1 {9 y3 [+ ^( v B. [( s my-column ;; the column of the intersection counting from the upper left corner of the
4 k/ [6 _% u# H% r" ~2 C5 M ;; world. -1 for non-intersection patches.2 u6 u; C& u" E# z4 R
my-phase ;; the phase for the intersection. -1 for non-intersection patches.# z) t/ K9 Y1 y* ~& C
auto? ;; whether or not this intersection will switch automatically.
$ ]' @5 Q) r% K ;; false for non-intersection patches.0 n% o7 r& p, A+ k- C4 m7 A
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;;;;;;;;;;;;;;;;;;;;;;; {% R8 w% y8 e Y& `
;; Setup Procedures ;;
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, I4 u9 F' y: K* ?;; Initialize the display by giving the global and patch variables initial values.2 M% H+ s+ c1 h: k# K
;; Create num-cars of turtles if there are enough road patches for one turtle to% d5 _/ s% w( j9 O
;; be created per road patch. Set up the plots.2 c) O* h# A. a/ [& F$ ]3 h0 m* i
to setup R+ W3 l/ D5 ^# t- A4 e) y
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setup-globals
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4 k3 Y$ o k6 q( t% U: e ;; First we ask the patches to draw themselves and set up a few variables- O4 x( R! t7 M+ @
setup-patches
3 u$ d" ] n! H; i# K0 c( G make-current one-of intersections: p4 v1 K9 T/ f( r4 H, j `: Q
label-current
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- l7 m7 Q0 a0 e# ? set-default-shape turtles "car"- ]+ f9 I1 a6 r" k! b. }6 P& i
q4 k2 ~6 }& q if (num-cars > count roads)
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8 J( J2 g; K8 Y* e user-message (word "There are too many cars for the amount of "& ^$ E! a8 s' b, h
"road. Either increase the amount of roads "# ^* n2 J5 ?/ r% A; C" p1 e
"by increasing the GRID-SIZE-X or "9 T }) ]9 u: d/ L7 N# a
"GRID-SIZE-Y sliders, or decrease the "
* E' O; O- M; W+ L "number of cars by lowering the NUMBER slider.\n" `( y; h+ w2 s. S5 |
"The setup has stopped.")# W8 K" ~( Q/ ]9 v
stop- U: T. `+ j7 |" I7 J/ D5 X
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) G+ v* ^3 p( H7 T' y crt num-cars
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! b9 {; m2 @; r2 c' _ setup-cars
. p1 A2 s$ T% ]: C' m0 a) T set-car-color
7 t/ a3 p) w* j2 v4 n/ E5 O, W) | record-data
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;; give the turtles an initial speed8 M! V/ p. Z& x
ask turtles [ set-car-speed ]5 l5 ^- U1 }1 S( z; G
7 _0 y+ E, R! g5 ~ reset-ticks# n4 h. S" a8 V# M* _% y
end
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;; Initialize the global variables to appropriate values( f: W% s, p8 c6 u0 r2 c: ^, |
to setup-globals
7 }) Q9 c. g! k set current-light nobody ;; just for now, since there are no lights yet
+ ]5 X% M; s' g3 h set phase 05 m% j2 D. g. o2 f
set num-cars-stopped 0* ] _7 O. L# Z4 H+ O" V
set grid-x-inc world-width / grid-size-x, q- R. h# t J# u" r0 T! h7 X5 Z
set grid-y-inc world-height / grid-size-y
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( C4 c- u3 E8 h2 s. |' u ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' ?5 p H5 [9 R3 K/ o& X5 @/ r set acceleration 0.099# D( D9 m' u8 V2 R5 _
end; g3 o$ D9 H- m) m( V; m
' H- A! r+ e8 N0 ]1 _;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ n1 Y l+ Z& t( ~) \
;; and initialize the traffic lights to one setting0 z$ J7 U7 U ^& L1 x" B; _$ k
to setup-patches
5 o- Y, d1 u* j2 \. ^. ] ;; initialize the patch-owned variables and color the patches to a base-color9 o7 ?/ [ m x7 g1 x
ask patches7 X" w2 W4 G- x) `# g3 L8 S
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: y: b/ {, O/ H j& k set intersection? false2 r: C4 q$ t# f. q* \6 b7 b; J
set auto? false
* z# _/ i+ m2 Y+ c [& A' k set green-light-up? true. p/ h- F4 o8 t( t u8 ^6 U
set my-row -12 T: v8 k) h* o. ^4 w! n1 a
set my-column -19 A5 J$ a) _. U1 ~ L2 Z3 q: d
set my-phase -1 Y5 S9 f" W% F+ y9 H% B
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets, A! Q# [' Z3 k- H5 e% P
set roads patches with" N2 n0 d6 a4 X7 w( Z+ M8 t% }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ P" S/ l- K I* N5 q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 [$ \0 ~6 w. _8 z( l2 y' V3 K set intersections roads with r) P* ]% F3 F: j" G3 a; i9 M8 p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 a' T* f" [1 I0 S# a2 ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. N9 `/ u0 Y" X& ~( L5 g
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ask roads [ set pcolor white ]5 v+ `, p4 u+ {- `/ k8 Q0 n. [8 h7 O
setup-intersections8 u1 R d6 \& V; ^
end
5 y+ L) V3 K% u7 ?其中定义道路的句子,如下所示,是什么意思啊?
. L' s. A' [; x% z+ ^ set roads patches with
1 s$ c+ ~4 p4 K0 H% s8 W+ K7 x! H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- n+ ?* e) ?) X/ q% `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% o) C( R% P/ M0 z9 M( }0 k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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