Hi guys,

I met a problem.There is a part of my objective function that I don’t know how to represent.

f(a,c)=(a.^2./c)

c is nonnegative，and a, c are 1*n vectors

I don’t know how to transform it into a formula that conforms to the DCP principle.

Thanks

help quad_over_lin

quad_over_lin Sum of squares over linear.

Z=quad_over_lin(X,Y), where X is a vector and Y is a scalar, is equal to

SUM(ABS(X).^2)./Y if Y is positive, and +Inf otherwise. Y must be real.`If X is a matrix, quad_over_lin(X,Y) is a row vector containing the values of quad_over_lin applied to each column. If X is an N-D array, the operation is applied to the first non-singleton dimension of X. quad_over_lin(X,Y,DIM) takes the sum along the dimension DIM of X. A special value of DIM == 0 is accepted here, which is automatically replaced with DIM == NDIMS(X) + 1. This has the effect of eliminating the sum; thus quad_over_lin( X, Y, NDIMS(X) + 1 ) = ABS( X ).^2 ./ Y. In all cases, Y must be compatible in the same sense as ./ with the squared sum; that is, Y must be a scalar or the same size as SUM(ABS(X).^2,DIM). Disciplined convex programming information: quad_over_lin is convex, nonmontonic in X, and nonincreasing in Y. Thus when used with CVX expressions, X must be convex (or affine) and Y must be concave (or affine).`

Many thanks for your kindly reply!