Fix compute_error

Signed-off-by: ashmeigh <[email protected]>

mantidimaging/core/rotation/polyfit_correlation.py

@@ -54,9 +54,9 @@ def find_center(images: ImageStack, progress: Progress) -> tuple[ScalarCoR, Degr
     # corresponding to (search_range, square sum). This is awkward to navigate
     # we transpose store to make the array hold (square sum, search range)
     # so that each store[row] accesses the information for the row's square sum across all search ranges
-    _find_shift(images, search_range, min_correlation_error, shift)
+    _find_shift(images, search_range, min_correlation_error.array, shift.array)
 
-    par = np.polyfit(slices, shift, 1)
+    par = np.polyfit(slices, shift.array, deg=1)
     m = par[0]
     q = par[1]
     LOG.debug(f"m={m}, q={q}")
@@ -97,4 +97,5 @@ def _find_shift(images: ImageStack, search_range: range, min_correlation_error:
 def get_search_range(width: int) -> range:
     tmin = -width // 2
     tmax = width - width // 2
-    return range(tmin, tmax + 1)
+    search_range = range(tmin, tmax + 1)
+    return search_range