sigmoid.m文件
function g = sigmoid(z)%SIGMOID Compute sigmoid functoon% J = SIGMOID(z) computes the sigmoid of z.
g = zeros(size(z)); 初始化g ,z可以是一个数,一个向量或者一个矩阵
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SyntaxIN=inpolygon(X,Y,xv,yv)=inpolygon(X,Y,xv,yv)DescriptionIN=inpolygon(X,Y,xv,yv) returnsamatrix IN thesamesizeas X and Y.Eachelementof IN isassignedthevalue1or0depen……