add cpxmod field to eigs function in math module (#2074)

* add cpxmod field to eigs function in math module

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: German <[email protected]>

Author: 3 people

src/ansys/mapdl/core/math.py

@@ -902,7 +902,18 @@ def sparse(self, mat, thresh="", **kwargs):
         kwargs.setdefault("mute", True)
         self._mapdl.run(f"*COMP,{mat.id},SPARSE,{thresh}", **kwargs)
 
-    def eigs(self, nev, k, m=None, c=None, phi=None, algo=None, fmin=None, fmax=None):
+    def eigs(
+        self,
+        nev,
+        k,
+        m=None,
+        c=None,
+        phi=None,
+        algo=None,
+        fmin=None,
+        fmax=None,
+        cpxmod=None,
+    ):
         """Solve an eigenproblem.
 
         Parameters
@@ -933,6 +944,8 @@ def eigs(self, nev, k, m=None, c=None, phi=None, algo=None, fmin=None, fmax=None
             fmin = ""
         if not fmax:
             fmax = ""
+        if not cpxmod:
+            cpxmod = ""
 
         cid = ""
         if not c:
@@ -947,7 +960,7 @@ def eigs(self, nev, k, m=None, c=None, phi=None, algo=None, fmin=None, fmax=None
 
         self._mapdl.run("/SOLU", mute=True)
         self._mapdl.run("antype,modal", mute=True)
-        self._mapdl.run(f"modopt,{algo},{nev},{fmin},{fmax}", mute=True)
+        self._mapdl.run(f"modopt,{algo},{nev},{fmin},{fmax},{cpxmod}", mute=True)
         ev = self.vec()
 
         phistr = "" if not phi else phi.id