Error(s) in re-building vignettes:
--- re-building ‘interp.Rnw’ using Sweave
Error: processing vignette 'interp.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'interp.tex' failed.
LaTeX errors:
! LaTeX Error: File `flexisym.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

! Emergency stop.
<read *> 
         
l.15 \usepackage
                {breqn}^^M
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘interp.Rnw’

--- re-building ‘partDeriv.Rnw’ using Sweave

Attaching package: ‘Ryacas’

The following object is masked from ‘package:stats’:

    integrate

The following objects are masked from ‘package:base’:

    %*%, det, diag, diag<-, lower.tri, upper.tri

Warning: `stat_contour()`: Zero contours were generated
Warning in min(x) : no non-missing arguments to min; returning Inf
Warning in max(x) : no non-missing arguments to max; returning -Inf
Warning: `stat_contour()`: Zero contours were generated
Warning in min(x) : no non-missing arguments to min; returning Inf
Warning in max(x) : no non-missing arguments to max; returning -Inf
Warning: `stat_contour()`: Zero contours were generated
Warning in min(x) : no non-missing arguments to min; returning Inf
Warning in max(x) : no non-missing arguments to max; returning -Inf
Warning: `stat_contour()`: Zero contours were generated
Warning in min(x) : no non-missing arguments to min; returning Inf
Warning in max(x) : no non-missing arguments to max; returning -Inf
Error: processing vignette 'partDeriv.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'partDeriv.tex' failed.
LaTeX errors:
! LaTeX Error: File `flexisym.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

! Emergency stop.
<read *> 
         
l.15 \usepackage
                {breqn}^^M
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘partDeriv.Rnw’

--- re-building ‘tri.Rnw’ using Sweave
Error: processing vignette 'tri.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'tri.tex' failed.
LaTeX errors:
! LaTeX Error: File `flexisym.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

! Emergency stop.
<read *> 
         
l.15 \usepackage
                {breqn}^^M
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘tri.Rnw’

SUMMARY: processing the following files failed:
  ‘interp.Rnw’ ‘partDeriv.Rnw’ ‘tri.Rnw’

Error: Vignette re-building failed.
Execution halted