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...commands: Picture1 *RECOMMANDATION* *Picture2* *Code of CROSSPROD* Picture 3 If we are recoding the CROSSPROD function with PROTECTT No more issues? Do you have any idea to solve this bug? Any recommendations? Thank you by advance for your help. Best regards, Guillaume Collange -- Guillaume Collange -------------- next part -------------- A non-text attachment was scrubbed... Name: Picture1.png Type: image/png Size: 95784 bytes Desc: not available URL: <https://stat.ethz.ch/pipermail/r-devel/attachments/20180108/62b1680d/attachment.png> -------------- next part...

...agree there is no harm protecting defensively. R itself calls dgemm with the R object for the result protected when calculating matrix products, but there it is needed because there is further allocation when setting up attributes for the result. Best Tomas On 01/08/2018 02:41 PM, Guillaume Collange wrote: > Dear all, > > > > I would like to submit an issue that we are facing. > > > > Indeed, in our environment, we are optimizing the R code to speed up some > mathematical calculations as matrix products using the INTEL libraries ( > MKL) ( https://software.int...