Embedded Conic Solver in R. This is an R wrapper around the ecos project on GitHub which describes ECOS as below.
ECOS is a numerical software for solving convex second-order cone programs (SOCPs) of type
$$ \mbox{Minimize } c'x \mbox{ such that } {\mathbf Ax} = {\mathbf b} \mbox{ and } {\mathbf G \mathbf x}\,\, \leq_{\mathbf K}\,\, {\mathbf h} $$ where the last inequality is generalized, that is, ${\mathbf h}-\mathbf{Gx}$ belongs to the cone ${\mathbf K}$.
ECOS supports the positive orthant ${\mathbf R}_+$, second-order cones ${\mathbf Q}_n$ defined as
$$ {\mathbf Q}_n = \bigl{ (t,{\mathbf x}) | t >= \lVert{\mathbf x}\rVert_2 \bigr} $$
with $t$ a scalar and ${\mathbf x} \in {\mathbf R}_{n-1}$, and the exponential cone ${\mathbf K}_e$ defined as
$$ \mathbf{K}_e = \mbox{closure} \bigl{ (x,y,z) | exp(x/z) <= y/z, z>0 \bigr}, $$
where $(x,y,z) \in {\mathbf R}^3$.
The cone ${\mathbf K}$ is therefore a direct product of the positive orthant, second-order, and exponential cones:
$$ {\mathbf K} = {\mathbf R}+ \times {\mathbf Q}{n_1} \times \cdots \times {\mathbf Q}_{n_N} \times {\mathbf K}_e \times \cdots \times {\mathbf K}_e. $$
Note that the ECOS C language sources are included here. Changes to the original source are clearly delineated for easy reference.
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