Merge pull request #82 from chrhansk/hotfix-cutest-nonlinear-equations

Fix error in detection of nonlinear equations

docs/conf.py

@@ -14,7 +14,7 @@
 project = "pygradflow"
 copyright = "2023, Christoph Hansknecht"
 author = "Christoph Hansknecht"
-release = "0.4.12"
+release = "0.4.13"
 
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration

pygradflow/runners/cutest_runner.py

@@ -89,7 +89,10 @@ def y0(self):
         return self.instance.v0
 
 
-class LSQCUTEstProblem(Problem):
+# Nonlinear equations: Goal is to minimize the violation
+# 1/2 ||c(x)||^2 subject to problem bounds. Constraint
+# functions are used to access the residuals and their derivatives
+class NECUTEstProblem(Problem):
     def __init__(self, instance):
         self.instance = instance
         var_lb = cutest_map_inf(instance.bl)
@@ -151,8 +154,10 @@ def solve(self, params):
 
         props = pycutest.problem_properties(self.instance)
 
-        if props["objective"] == "none":
-            problem = LSQCUTEstProblem(problem)
+        is_ne = self.name.endswith("NE")
+
+        if is_ne:
+            problem = NECUTEstProblem(problem)
         elif problem.m == 0:
             problem = UnconstrainedCUTEstProblem(problem)
         else:

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pygradflow"
-version = "0.4.12"
+version = "0.4.13"
 description = "PyGradFlow is a simple implementation of the sequential homotopy method to be used to solve general nonlinear programs."
 authors = ["Christoph Hansknecht <[email protected]>"]
 readme = "README.md"