How to save a VERY LARGE .rda file in R package -

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I'm eager to save two 460 x 5000 numeric matrix in my R-package. Following the instructions given in: I saved the object as: 

 save  save (mat1, file = "mat1.rda", compress = "xz") (mat2 , File = "mat2.rda" However, the resulting R-objects are large (8.7 MB and 8.9 MB) and RMD checks - AS-Crane gives me notes:  
  * Install package Check the size ... Note The installed size is 20.1Mb ​​sub-directory of 1Mb or more: Data 20.0Mb   
 In my understanding, no R package should be given to CRAN Can not access that which does not "pass" (i.e., no notes or warnings) RCMD checkle-as-crane. Is there a way to reduce dataset?   
 
 
 Is it really necessary to include those files? I see several options:  
     
  •  A small matrix Include subsets, which you use in instances.  
  •  Generate on-the-mike matrix, e.g., random number Keep up with.  
  •  somewhere to download the files, and do not make sure that the examples performed.

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