## Solver m1qn3

### General Description

### SIF contents

The required keywords in the SIF file for this solver are:

Solver 6
Equation = "Optimize_m1qn3"
procedure = "ElmerIceSolvers" "Optimize_m1qn3Parallel"
Cost Variable Name = String "CostValue"
Optimized Variable Name = String "Beta"
Gradient Variable Name = String "DJDBeta"
gradient Norm File = String "GradientNormAdjoint_$name$.dat"
! M1QN3 Parameters
M1QN3 dxmin = Real 1.0e-10
M1QN3 epsg = Real 1.e-6
M1QN3 niter = Integer 200
M1QN3 nsim = Integer 200
M1QN3 impres = Integer 5
M1QN3 DIS Mode = Logical False
M1QN3 df1 = Real 0.5
M1QN3 normtype = String "dfn"
M1QN3 OutputFile = File "M1QN3_$name$.out"
M1QN3 ndz = Integer 20

### Examples

A 3D examples can be found in `[ELMER_TRUNK]/elmerice/Tests/InvMeth*`

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### Solver's references to cite

Since its version 3.2 (December 2008), M1QN3 is ditributed under the GNU General Public License and listed in the Free Software Directory.
You are also kindly asked to mention the following paper in your publications for which M1QN3 has been used:

J.Ch. Gilbert and C. Lemaréchal (1989). Some numerical experiments with variable-storage quasi-Newton algorithms. *Mathematical Programming* 45, 407-435.