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Keywords from Image Description:
Logistic curve vector field. ja Scilab own Yapparina other versions Scilab source clear rate of natural increase capacity deff 'ydot ' 'ydot ' equation is population size ydot is dy tc nc dx zeros length tc length nc dy zeros length tc length nc for nnc length nc for ntc length tc dx ntc nnc cos atan tc ntc nc nnc