## Description of projects

The 30 Jyväskylä Summer school, 9.08.2021 – 13.08.2021, course in computational sciences “COM5: Machine learning in inverse and ill-posed problems”, see more info at

COM5: Machine learning in inverse and ill-posed problems

Zoom link for lectures: https://gu-se.zoom.us/j/67351656441?pwd=VjdtVzJ1ZTFlOVFnaXBieGlkTmhJQT09

Meeting ID: 673 5165 6441

P.: 746622

Project “Solution of time-harmonic coefficient inverse problem” (pdf file)

Project description (beamer presentation)

The data for the project “SOLUTION OF TIME-HARMONIC COEFFICIENT INVERSE PROBLEM” is available for free download from the following links:

- Observation data for the wave speed
*a(x)*in Test 1 with 3% additive noise, OBSref5noise3h03125gaus1.zip (14.2 Mb) - Observation data for the wave speed
*a(x)*in Test 2 with 3% additive noise, OBSref5noise3h03125gaus2.zip (26.5 Mb) - Observation data for the wave speed
*a(x)*in Test 1 with 10% additive noise, OBSref5noise10h03125gaus1.zip (14.2 Mb) - Observation data for the wave speed
*a(x)*in Test 2 with 10% additive noise, OBSref5noise10h03125gaus2.zip (26.5 Mb)

## Programs for download

### solution of Helmholtz equation in 2-d

The C++/PETSc code for solution of Helmholtz equation in 2-D with complex exact solution: ComplexMaxwellTest2D.zip

The C++/PETSc code for solution of Helmholtz equation with different preconditioners (Jacobi, Gauss-Seidel, SOR) Code

The C++/PETSc code for solution of Helmholtz equation in 2D with computation of convergence Code

The Matlab code (Perceptron Learning and least squares algorithms) with database (*.xlsx file) for classification of Grey Seals.