Flatten coordinate array in map_and_read_data (#237)

* Flatten coordinate array in map_and_read_data

* Apply suggestions from code review

* Add Changelog entry

---------

Co-authored-by: Benjamin Rodenberg <benjamin.rodenberg@cit.tum.de>

Author: r-walloner

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All notable changes to this project will be documented in this file.
 
+## latest
+
+* Fix bug in `map_and_read_data` https://github.com/precice/python-bindings/pull/237
+
 ## 3.2.0
 
 * Update `requirements.txt` of the solver dummy https://github.com/precice/python-bindings/pull/233

cyprecice/cyprecice.pyx

@@ -997,7 +997,7 @@ cdef class Participant:
         size = coordinates.shape[0]
         dimensions =  self.get_data_dimensions(mesh_name, data_name)
 
-        cdef vector[double] cpp_coordinates = coordinates
+        cdef vector[double] cpp_coordinates = coordinates.flatten()
         cdef vector[double] cpp_values = [-1 for _ in range(size * dimensions)]
 
         self.thisptr.mapAndReadData (convert(mesh_name), convert(data_name), cpp_coordinates, relative_read_time, cpp_values)