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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。1 ]# A1 C" N2 S( D+ I5 r* J. R
netlogo自带的social science--traffic grid这一例子当中,) ?2 ?% @+ T% q8 R* ~
globals" r/ L& u2 w# O M
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grid-x-inc ;; the amount of patches in between two roads in the x direction
5 g1 q5 S( d8 M, W5 d7 M grid-y-inc ;; the amount of patches in between two roads in the y direction
# A) b) v P1 A; h, T9 k acceleration ;; the constant that controls how much a car speeds up or slows down by if
! R& o% K" A4 g4 A! r ;; it is to accelerate or decelerate
1 |- C! b; U+ X phase ;; keeps track of the phase) R# v4 g6 f( f% S4 u( d% [
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
/ z, u$ l* n# }2 i) c current-light ;; the currently selected light
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+ ]) V2 r+ R, T0 e* ~9 c U ;; patch agentsets; u3 H& E* o: y2 ?) r& \
intersections ;; agentset containing the patches that are intersections) ~* \" c, f2 Q+ r
roads ;; agentset containing the patches that are roads
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4 A8 |! i, U j y7 n; b( Gturtles-own1 m+ _2 `* Y6 [
[
" G* `7 G+ G5 T: j# }+ X4 c. Z2 Z speed ;; the speed of the turtle
5 ~% E% _8 I- L5 `' S e& _ up-car? ;; true if the turtle moves downwards and false if it moves to the right' w) ?; L9 z2 Z n: Q5 _
wait-time ;; the amount of time since the last time a turtle has moved3 g: \, S& s6 Y$ H
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patches-own2 ^1 d% z) a, F! U) P$ T+ i2 @
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intersection? ;; true if the patch is at the intersection of two roads
' {3 n2 q. b, @0 k% T' w) ] green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' _/ l, e+ P" \0 {4 }+ d ;; false for a non-intersection patches.1 I9 v+ K N6 ]" |/ P S S
my-row ;; the row of the intersection counting from the upper left corner of the9 x& o% h8 s$ t! M
;; world. -1 for non-intersection patches.: O1 H0 I5 K: h3 m7 u
my-column ;; the column of the intersection counting from the upper left corner of the
/ U: t3 }3 ^! e( J4 f ;; world. -1 for non-intersection patches.+ `9 K% V* L \ Z
my-phase ;; the phase for the intersection. -1 for non-intersection patches.: e, g8 N( |- w
auto? ;; whether or not this intersection will switch automatically.
6 v) ~1 C7 j# U+ q9 C/ F6 L, f" W ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;5 d* @' ~* e% S) H
;; Setup Procedures ;;6 j# U: O3 ^& x7 S
;;;;;;;;;;;;;;;;;;;;;;0 H5 @7 O8 k. I2 {
' [+ b, L5 t3 E( W1 `: k7 J;; Initialize the display by giving the global and patch variables initial values.' \3 }5 H, a$ i- D# W1 l
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 v U3 k+ [* a& D;; be created per road patch. Set up the plots.; I! R# p' O6 w( f4 d' Q
to setup
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setup-globals# S+ \- H' d# y0 e0 b0 I; l( G& {
9 d e7 `5 T- A2 {. C ;; First we ask the patches to draw themselves and set up a few variables
+ N) ]. j" C+ f) o4 f setup-patches# }1 n. L" j4 D5 x0 A; s/ e
make-current one-of intersections
9 v, c% l- U- B' ?# u- t! S+ t! O+ } label-current# h0 o7 U1 ^2 g& p6 N6 Z
- m& @8 V3 c' | set-default-shape turtles "car"9 E. }& k8 h N' }. ]! Y6 M) i
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if (num-cars > count roads)
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9 z* R4 v$ R3 ~- V% H# O6 i user-message (word "There are too many cars for the amount of "
7 |# i M7 Z& _7 h% H "road. Either increase the amount of roads "% |, Z* |9 V/ z6 E2 K9 u3 o& }( T
"by increasing the GRID-SIZE-X or "/ s( `, f& J) F( `( q
"GRID-SIZE-Y sliders, or decrease the "
7 q0 x6 @, o" ]; j" A) y4 |4 _ "number of cars by lowering the NUMBER slider.\n"$ ], M0 `8 U' P/ q
"The setup has stopped.")
* u) [) R( c: f stop
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- F; c3 o" X' s* Z ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' i; J7 y; h9 R2 @; ~- Q- a R4 ~ crt num-cars/ u3 ]. s; n( F! ^, l
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setup-cars; p1 C' q6 l+ r5 y
set-car-color1 w4 ~% T W, v a# W' _8 }5 D) Y
record-data! m& N, O8 P) ] z7 c
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* h4 ?6 t% O* U: h/ I: L! ~! } ;; give the turtles an initial speed- ~- B, v+ ^' C9 Y9 V
ask turtles [ set-car-speed ]/ u8 a4 |; p' G' ~. \ q
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reset-ticks! t$ F2 J: {8 ~) j! Q) ~
end
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$ d L- l3 ?4 N2 l+ M;; Initialize the global variables to appropriate values2 v# ^* Z) F+ a
to setup-globals
5 A) x8 D$ e% @1 }2 ^- K$ M, ` set current-light nobody ;; just for now, since there are no lights yet* `4 U! N3 A* n* }( K8 s4 i" y
set phase 0. m2 M7 Q% `) A/ L+ i7 v
set num-cars-stopped 0
1 e" |% J) |. P set grid-x-inc world-width / grid-size-x9 M7 s" L9 }! H4 K8 [+ |, n
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 r# Y! W: f- w7 z) @1 r9 q set acceleration 0.0998 ] ~, ^5 Q6 V6 |
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
) u1 I1 L7 g& s" p0 O. }# W; |;; and initialize the traffic lights to one setting) }" x/ f4 P j6 O/ g7 \
to setup-patches
0 {% n+ T; j# w1 J5 K G ;; initialize the patch-owned variables and color the patches to a base-color5 R5 c7 P, A% V2 r; Q1 v$ T
ask patches
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set intersection? false5 N5 G2 \% a( I# q/ H r) v7 Z
set auto? false9 |, ]# E+ U8 P* p; `8 K. ]* ]+ F7 R
set green-light-up? true
4 L3 S5 }* r% e/ P# S- j' ?/ O `& Y set my-row -1+ a+ W3 h6 [7 P2 y
set my-column -1
- w% I1 S# }* q3 e% T; \ set my-phase -1
; L# g, {; i5 D7 E( l; T5 {* L0 X set pcolor brown + 3
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2 b" G8 Z$ U2 P/ v1 r* [ ;; initialize the global variables that hold patch agentsets
7 R1 O0 ~6 F" k: Q# p set roads patches with
8 c/ _. r( S8 y5 U [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, K" f4 \8 ?6 c% @. w% l (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* z4 V: `3 E9 U0 o n! W) G" A
set intersections roads with) _5 i" u/ H& }5 _* M$ J
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ [4 x1 ~0 B2 c9 p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& q# [2 U, c( o, |- V/ E: ^; E
7 B% H8 r& l, _7 v ask roads [ set pcolor white ]# J2 e. u- Q0 o, d
setup-intersections
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W( m% F& B# e0 p7 G* L其中定义道路的句子,如下所示,是什么意思啊?: }) f s# D) Y/ p" b
set roads patches with
, r8 r/ n2 [) G: ?! W) R [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; }7 f8 t& _ C! X9 m/ c1 E+ |! ^ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* _% I! p. [' H' J/ N. _
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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