Fix rotate and poisson

lapy/diffgeo.py

@@ -366,7 +366,11 @@ def tria_compute_rotated_f(tria, vfunc):
     #   we can pass identity instead of B here:
     # div is the integrated divergence (so it is already B*div)
     fem.mass = sparse.eye(fem.stiffness.shape[0], dtype=vfunc.dtype)
-    vf = fem.poisson(divf)
+    # since the solution is ill defined (addition of constant)
+    # we specify an arbitrary boundary condition at a single vertex to
+    # remove that degree of freedom
+    dtup = ( np.array([0]), np.array([0.0]))
+    vf = fem.poisson(divf,dtup)
     return vf
 
 

lapy/plot.py

@@ -171,7 +171,7 @@ def _get_colorval(t, colormap):
     # compute new color via linear interpolation
     cval = np.rint(rv1 + tt * (rv2 - rv1)).astype(int)
     # format as string again
-    cstr = "rgb(%d, %d, %d)" % (cval[0], cval[1], cval[2])
+    cstr = f"rgb({cval[0]:d}, {cval[1]:d}, {cval[2]:d})"
     return cstr
 
 

lapy/solver.py

@@ -705,6 +705,8 @@ def poisson(self, h=0.0, dtup=(), ntup=()):  # poissonSolver
             raise ValueError(
                 "h should be either scalar or column vector with row num of A"
             )
+        if h.ndim == 1:
+            h = h[:,np.newaxis]
         # create vector d
         didx = []
         dvec = []

pyproject.toml

@@ -7,7 +7,7 @@ build-backend = 'setuptools.build_meta'
 
 [project]
 name = 'lapy'
-version = '1.2.0-dev'
+version = '1.1.2'
 description = 'A package for differential geometry on meshes (Laplace, FEM)'
 readme = 'README.md'
 license = {file = 'LICENSE'}