**dqed_test**,
a Fortran90 code which
calls dqed(), which
solves (square) systems of nonlinear equations, or minimizes the
residual in a set of nonlinear equations, using least squares,
by Richard Hanson and Fred Krogh.

The information on this web page is distributed under the MIT license.

dqed, a Fortran90 code which solves (square) systems of nonlinear equations, or minimizes the residual in a set of nonlinear equations, using least squares, by Richard Hanson and Fred Krogh.

**Problem 1** tries to fit data for a model of the heart. Several
datasets are examined, exact and approximate jacobians are
compared, and two equations are tried as constraints instead
of equations.

- dqed_test1.f90, a sample problem.
- dqed_test1.sh, runs the test.
- dqed_test1_input.txt, input for the sample problem.
- dqed_test1.txt, sample problem output.

**Problem 2** tries to fit data.

- dqed_test2.f90, a sample problem.
- dqed_test2.sh, runs the test.
- dqed_test2.txt, sample problem output.

**Problem 3** tries to fit data.

- dqed_test3.f90, a sample problem.
- dqed_test3.sh, runs the test.
- dqed_test3.txt, sample problem output.

**Problem 4** is like problem 3, but is set up to solve a problem
involving the absorption of carbon and nitrogen isotopes by
an alligator from its prey.

- dqed_test4.f90, a sample problem.
- dqed_test4.sh, runs the test.
- dqed_test4.txt, sample problem output.

**Problem 5** shows how, if the nonlinear constrained system to be solved
is actually a LINEAR constrained system, the user may call the DBOLS routine
directly.

- dqed_test5.f90, a sample problem.
- dqed_test5.sh, runs the test.
- dqed_test5.txt, sample problem output.