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Delete constraint(s), add and remove multiple warmstarts #121

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Delete constraint(s), add and remove multiple warmstarts #121

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665175a
Added add_warm_start!, del_warm_start!
Mar 21, 2017
363d2af
Update cpx_model.jl
Mar 21, 2017
badadba
Added del_constrs!
Mar 21, 2017
324fa2a
Updated del_constrs!
Mar 21, 2017
855113a
Add and delete multiple warm starts with effort levels
Mar 21, 2017
1bb9042
Changed add_warm_start! -> set_warm_start! and removed type annotation
Mar 21, 2017
832185c
start -> starts wherever applicable
Mar 21, 2017
f66d12a
warm_start(s) -> mip_start(s)
Mar 21, 2017
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15 changes: 15 additions & 0 deletions src/cpx_constrs.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -130,6 +130,21 @@ function add_rangeconstrs!(model::Model, A::CoeffMat, lb::Vector, ub::Vector)
add_rangeconstrs_t!(model, transpose(A), lb, ub)
end

del_constrs!{T<:Signed}(model::Model, ind::T) = del_constrs!(model, ind, ind)

function del_constrs!{T<:Signed}(model::Model, start_ind::T, end_ind::T)
stat = @cpx_ccall(delrows, Cint, (
Ptr{Void},
Ptr{Void},
Cint,
Cint
),
model.env.ptr, model.lp, convert(Cint, start_ind-1), convert(Cint, end_ind-1))
if stat != 0
throw(CplexError(model.env, stat))
end
end

function num_constr(model::Model)
ncons = @cpx_ccall(getnumrows, Cint, (
Ptr{Void},
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51 changes: 51 additions & 0 deletions src/cpx_model.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -174,6 +174,57 @@ function set_warm_start!(model::Model, indx::IVec, val::FVec, effortlevel::Integ
end
end

function add_warm_start!(model::Model, x::Vector{Vector{Float64}}, efforts::Vector{Cint})
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I'm not crazy about the naming here. Probably better to write this as set_warm_starts!.

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Sure

beg::Vector{Cint}, inds::Vector{Cint}, vals::Vector{Cdouble} = Cint[], Cint[], Cdouble[]
count::Int64 = 1
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Type annotation here shouldn't be necessary.

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Sorry about that. Its just an old habit.

for i in 1:length(x)
push!(beg, count)
for j in 1:length(x[i])
push!(inds, j)
push!(vals, x[i][j])
count += 1
end
end
add_warm_start!(model, convert(Cint, length(x)), beg, inds, vals, efforts)
end

add_warm_start!{T<:Signed}(model::Model, x::Vector{Float64}, effort::T) = add_warm_start!(model, convert(Cint, 1), Cint[1], Cint[1:length(x);], x, [convert(Cint, effort)])

function add_warm_start!(model::Model, num_warm_starts::Cint, beg::Vector{Cint}, inds::Vector{Cint}, vals::Vector{Cdouble}, efforts::Vector{Cint})
stat = @cpx_ccall(addmipstarts, Cint, (
Ptr{Void},
Ptr{Void},
Cint,
Cint,
Ptr{Cint},
Ptr{Cint},
Ptr{Cdouble},
Ptr{Cint},
Ptr{Ptr{Cchar}}
),
model.env.ptr, model.lp, num_warm_starts, length(inds), beg - 1, inds - 1, vals, efforts, fill(C_NULL, num_warm_starts))
if stat != 0
throw(CplexError(model.env, stat))
end
end

del_warm_start!{T<:Signed}(model::Model, ind::T) = del_warm_start!(model, convert(Cint, ind), convert(Cint, ind))

del_warm_start!{T<:Signed}(model::Model, start_ind::T, end_ind::T) = del_warm_start!(model, convert(Cint, start_ind), convert(Cint, end_ind))

function del_warm_start!(model::Model, start_ind::Cint, end_ind::Cint)
stat = @cpx_ccall(delmipstarts, Cint, (
Ptr{Void},
Ptr{Void},
Cint,
Cint
),
model.env.ptr, model.lp, start_ind-1, end_ind-1)
if stat != 0
throw(CplexError(model.env, stat))
end
end

function free_problem(model::Model)
tmp = Ptr{Void}[model.lp]
stat = @cpx_ccall(freeprob, Cint, (Ptr{Void}, Ptr{Void}), model.env.ptr, tmp)
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