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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 C' ?7 ]3 p. m
netlogo自带的social science--traffic grid这一例子当中,1 R8 U: @3 e8 j6 p& f- ]& J0 W
globals2 V: M2 R3 O) C2 ?, ~" n: O( P
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grid-x-inc ;; the amount of patches in between two roads in the x direction
& j# j" @4 t3 g, z- l* @ grid-y-inc ;; the amount of patches in between two roads in the y direction
% e5 R1 Q$ V8 l* [ acceleration ;; the constant that controls how much a car speeds up or slows down by if0 O3 C4 E7 f( C9 _7 f4 Y; X
;; it is to accelerate or decelerate
3 v5 t3 K4 ?& A% c1 @ phase ;; keeps track of the phase
- d/ f8 H8 U4 W/ m. J: c num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure# [& N- N @& a. y& W
current-light ;; the currently selected light
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1 j! q0 g+ Z& K; b4 ?2 B ;; patch agentsets
; j' N6 z, }1 R O3 N+ I% b8 [ intersections ;; agentset containing the patches that are intersections, G! r" `/ s( {8 Z* H
roads ;; agentset containing the patches that are roads
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9 a- d6 N9 X( S0 lturtles-own
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, p7 n! X3 Z( f speed ;; the speed of the turtle
! A2 u! k$ b! j4 l( s( c up-car? ;; true if the turtle moves downwards and false if it moves to the right# {' y4 y+ l) ]+ ^' O7 q; T# e
wait-time ;; the amount of time since the last time a turtle has moved
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; N* C; B- W0 d; E+ Dpatches-own( ?+ V& o N) u5 I! ]% l8 V, h
[
" M6 {; ?. @0 u* t% y intersection? ;; true if the patch is at the intersection of two roads7 Z/ o9 p( o2 \
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
( k2 R4 |! u0 D' T" G1 \: ] ;; false for a non-intersection patches.1 y( E& P/ s$ b
my-row ;; the row of the intersection counting from the upper left corner of the
5 |& h/ Q/ k( b) B ;; world. -1 for non-intersection patches.
* V) L8 `! }* d* a- h$ O& p my-column ;; the column of the intersection counting from the upper left corner of the
' Y$ M7 v( K+ P; V* N5 H# s/ U, w ;; world. -1 for non-intersection patches.& \+ X; L, H2 b- c( O6 X4 S) d5 e2 Q/ \
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" S3 P3 m7 g1 E2 R auto? ;; whether or not this intersection will switch automatically.
9 y: D7 E# u2 Q3 F: R: a ;; false for non-intersection patches.4 j9 U* x$ L3 n( F
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+ M1 L3 c0 I1 S) \- E;;;;;;;;;;;;;;;;;;;;;;
0 H$ s- T& b8 h; Z4 I;; Setup Procedures ;;
9 o8 V4 ]' Y }& |2 `( }% [;;;;;;;;;;;;;;;;;;;;;;
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$ T( o3 N9 B: ?, o& l2 o;; Initialize the display by giving the global and patch variables initial values.9 Q* O9 T2 ~4 M' K. e/ Q% `
;; Create num-cars of turtles if there are enough road patches for one turtle to
+ l0 n; A8 e8 B8 y p! l;; be created per road patch. Set up the plots.$ c8 c9 \. Q) w2 p: O1 j, {
to setup
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setup-globals8 q6 F( \1 p/ w& r0 B9 |2 ~
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;; First we ask the patches to draw themselves and set up a few variables$ N! g4 T E1 P7 |1 k. ?
setup-patches' {4 d$ A- {* C) v
make-current one-of intersections
6 M' M# H& c$ r- m7 u+ Y label-current* h) ]5 u8 i, @: y" `
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set-default-shape turtles "car"
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if (num-cars > count roads). q& ?9 n8 s7 b0 y+ f$ l
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user-message (word "There are too many cars for the amount of "
' k+ w3 o- j/ R- { "road. Either increase the amount of roads "
. @: t+ N N7 E "by increasing the GRID-SIZE-X or "
7 i ] ? F' G: A5 z "GRID-SIZE-Y sliders, or decrease the "$ P" c. q1 x2 I" S
"number of cars by lowering the NUMBER slider.\n"
' W, i9 s% R4 g1 b$ @: N/ S "The setup has stopped.")
K7 l3 ~* R# ~! ?7 a9 k stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 H4 f9 F9 _" y
crt num-cars% i2 i( \( \- t; C
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setup-cars- z r( n6 Y2 A2 e
set-car-color3 S6 {9 r7 j- h$ k
record-data; a/ @3 j8 h. j! s8 E8 l3 o
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;; give the turtles an initial speed( e3 m5 f8 a. Y8 j3 o; | h/ n
ask turtles [ set-car-speed ]
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reset-ticks, i9 I, r; j! o( U4 U
end# _: Z# y. t0 m8 f; ]& Y U
7 r$ F$ o' s1 M;; Initialize the global variables to appropriate values/ n" I: ^9 o0 N% c; y( A
to setup-globals' J! W& P0 E2 ~" H8 u
set current-light nobody ;; just for now, since there are no lights yet5 B; I9 _* \/ R u; }; k
set phase 0
( I$ {( {" B) D* v0 d: K- E/ Y set num-cars-stopped 0
# x5 m0 c, e" [4 a$ l set grid-x-inc world-width / grid-size-x" s8 w1 W# _/ ]. |- [
set grid-y-inc world-height / grid-size-y
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$ u- a8 `: ~0 B6 \6 { ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 g5 b$ Y. X% y- a3 S
set acceleration 0.099
( B- m% N9 G8 K, Y' Y5 I+ ~& gend
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0 G3 D; U5 S- w! Y! H; O& Y* Z& Z;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' [# F. k% F% k- ?;; and initialize the traffic lights to one setting
* X* N* f/ E4 r) Z) P+ |& q0 Gto setup-patches
' ]5 I) Q' Z- W! ^ ;; initialize the patch-owned variables and color the patches to a base-color8 i: [4 y! S; b( x( @7 h
ask patches8 v+ {9 g0 D( b* ?& G* x2 H5 X
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2 P0 x! \ |" ? set intersection? false
+ `7 B% N- n" T7 u' {7 N% y9 U2 M set auto? false
7 s+ v& M/ d* R+ O# X, N. z2 i set green-light-up? true
7 @5 @# Q9 ]6 {) a8 @& F, E set my-row -1& g/ d" E7 ^ x
set my-column -1) U0 a$ d# N) ^9 i2 S
set my-phase -1* \5 r; c. p3 q- j5 J5 ]* y1 B
set pcolor brown + 32 E$ c% |: p3 ^- ?2 K% ^, A
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* V8 E( Y/ I- S; h" I- x ;; initialize the global variables that hold patch agentsets
+ A9 R- E" N3 j; R7 P7 D- f set roads patches with4 _9 O4 G4 e$ G* s2 ~$ M4 j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 }% s7 q4 J6 E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# ]/ }- Z* I# l8 C: v
set intersections roads with7 k5 C9 M# g( y5 |! e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: {' B, P4 b8 x% F* f+ S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], ?; e: \! O" g
" D/ m2 O3 [$ { R" V ask roads [ set pcolor white ]* b- G; b" Q# Z( X j
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?- u: @# @! h1 y% ]$ `
set roads patches with
* |7 Z+ T0 Z/ K# N% F [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 l; c% i6 s1 F9 B6 _ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: U* O* `9 G+ c% E1 O. t9 M
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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