Merge 9e00e52 into 5c988b0

opencollab · Mar 3, 2020 · 60d7b9d · 60d7b9d
2 parents 5c988b0 + 9e00e52
commit 60d7b9d
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/EXAMPLES/PYARPACK/README b/EXAMPLES/PYARPACK/README
@@ -38,6 +38,9 @@ You can also:
 Note:
 
 1. arpack data type (float, double, ...) must be consistent with A/B numpy dtypes (float32, float64, ...).
+   at python side, the data MUST be casted in the EXACT expected type (int32, int64, float, double, ...).
+   otherwise, C++ may not get the data the way it expects them: C++ will not know how to read python data.
+   if you are not sure how data have been passed from python to C++, set arpackSlv.debug = 1 and check out debug traces.
 2. sparse matrices must be provided in coo format (n, i, j, Mij), that is, as a tuple where:
    2.1. n is an integer.
    2.2. i, j, Mij are 1 x nnz numpy arrays.