Error(s) in re-building vignettes:
  ...
--- re-building ‘sars-r-package.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/sars.Rcheck/vign_test/sars/vignettes/sars-r-package_files/figure-html/unnamed-chunk-2-1.png
576x576 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 22192 bytes
Input file size = 22294 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 18158
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 18158

Output IDAT size = 18158 bytes (4034 bytes decrease)
Output file size = 18236 bytes (4058 bytes = 18.20% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/sars.Rcheck/vign_test/sars/vignettes/sars-r-package_files/figure-html/unnamed-chunk-3-1.png
1536x1152 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 54001 bytes
Input file size = 54151 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 50699
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 50699

Output IDAT size = 50699 bytes (3302 bytes decrease)
Output file size = 50777 bytes (3374 bytes = 6.23% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/sars.Rcheck/vign_test/sars/vignettes/sars-r-package_files/figure-html/unnamed-chunk-5-1.png
672x1824 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 87891 bytes
Input file size = 88089 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 72196
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 72196

Output IDAT size = 72196 bytes (15695 bytes decrease)
Output file size = 72274 bytes (15815 bytes = 17.95% decrease)


Quitting from lines 374-398 [unnamed-chunk-6] (sars-r-package.Rmd)
Error: processing vignette 'sars-r-package.Rmd' failed with diagnostics:
step factor 0.000488281 reduced below 'minFactor' of 0.000976562
--- failed re-building ‘sars-r-package.Rmd’

SUMMARY: processing the following file failed:
  ‘sars-r-package.Rmd’

Error: Vignette re-building failed.
Execution halted