How to run a function for each rows and columns?

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vigneshwaran Loganathan 2018-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/413609-how-to-run-a-function-for-each-rows-and-columns

评论： vigneshwaran Loganathan 2018-8-5

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I have a function called distance, where the values of x0 and y0 are taken from data,

data = 150*(4*rand(2,100)-1); data = data.*rand(2,100);

where, x0 is the value of first row & y0 is the value of second row, now my concern, how to run the function to each values of x0 and y0 in data and store them in list_d

below are the A, B, C parameters,

A=0.0022;B=0.0061;c=0.4229;

Thanks in advance

function list_d = distance(x0,y0,A,B,C)
P=[x0; y0 ];
Q =-C+P(2);
n1 = 2*A^2;
n2= 3*A*B;
n3=(B^2-2*A*Q+1);
n4=-B*Q-P(1);  
N = [n1 n2 n3 n4];
xT=roots(N); 
list_d=[]; %list of distance
d_min = Inf;
for  i =1:size(xT,1)
    if isreal(xT(i)) %Test each xT
      T=[xT(i); A.*xT(i)^2+B.*xT(i)+C];
      d =norm(P-T);
      list_d = [list_d d];
      if (d < d_min)
          d_min=d;
      end
    end
end