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| Keywords: Logistic curve vector field.png ja ロジスティック曲線と のベクトル図 Scilabで 成 2016-01-23 own Yapparina other versions Scilab source <source lang scilab > clear r 1; //intrinsic rate of natural increase K 1; //carrying capacity deff 'ydot g t y ' 'ydot r y 1-y/K ' ;//logistic equation y is population size ydot is dy/dt tc -2 0 4 2; nc -1 0 2 2; dx zeros length tc length nc ; dy zeros length tc length nc ; for nnc 1 length nc for ntc 1 length tc dx ntc nnc cos atan g tc ntc nc nnc ; dy ntc nnc sin atan g tc ntc nc nnc ; end end clf ; champ tc nc dx dy xtc -2 0 01 2 2; x K / 1+ K /0 5-1 exp -r xtc ;//logistic curve 1 the initial population size N0 0 5 plot2d xtc x xtc -2 0 01 0 45; x K / 1+ K /-0 5-1 exp -r xtc ;//logistic curve 2 N0 -0 5 plot2d xtc x xtc -0 4 0 01 2 2; x K / 1+ K /1 5-1 exp -r xtc ;//logistic curve 3 N0 1 5 plot2d xtc x xlabel 't' ; ylabel 'N' ; zoom_rect -2 1 -1 3 2 3 2 1 </source> cc-zero Logistic functions Vector fields | ||||
