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I updated LinearOperators
in JuliaSmoothOptimizers/LinearOperators.jl@6356eb3 for Julia 0.4 compatibility. The main change involved removing the use of Nothing
to indicate missing operations. In order to play well with both 0.3 and 0.4, all that needs to be changed is:
- require and import
Compat
- change constructs like
Alinop = LinearOperator(size(A,1), size(A,2), T, false, false,
v -> At_mul_B!(1.0,A,v,0.0,x),
nothing,
v -> At_mul_B!(1.0,A,v,0.0,x))
to
Alinop = LinearOperator(size(A,1), size(A,2), T, false, false,
v -> At_mul_B!(1.0,A,v,0.0,x),
Nullable{Function}(),
v -> At_mul_B!(1.0,A,v,0.0,x))
(e.g., in https://github.com/lruthotto/KrylovMethods.jl/blob/master/src/cg.jl#L7).
Note that there is a simplified constructor for real symmetric operators:
Alinop = LinearOperator(size(A,1), T, v -> At_mul_B!(1.0,A,v,0.0,x))
One of the symmetric
and hermitian
flags should probably be set to true
in your CG. Something like
Alinop = LinearOperator(size(A,1), size(A,2), T, T <: Real, (T <: Complex) && !(T <: Real),
v -> At_mul_B!(1.0,A,v,0.0,x),
Nullable{Function}(),
v -> At_mul_B!(1.0,A,v,0.0,x))
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