Chris_T avatar Chris_T committed b87584b

Document the fact that gemv does not handle properly n=0.

See also the bug report

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   vec ->
 (** [gemv ?m ?n ?beta ?ofsy ?incy ?y ?trans ?alpha ?ar ?ac a ?ofsx ?incx x]
-    see BLAS documentation!
+    see BLAS documentation!  BEWARE that, when [n=0], this function
+    has no effect while it should compute [y ← beta * y].
     @return vector [y], which is overwritten.
     @param m default = number of available rows in matrix [a]
     @param n default = available columns in matrix [a]
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