# Work around issue #645 in knitr library(methods)
cache=0 means no cache:
Sys.sleep(1) 1 + 1 plot(cars)
cache=1 means to save the results from
evaluate::evaluate(), and pretend
the code has been evaluated; all the output hooks will be applied every time
the document is recompiled; note the plots are also saved as display lists,
and will be redrawn every time the document is recompiled:
cache=2 is similar to
cache=1, and the only difference is that the plots
will not be redrawn, in which case you need to make sure you did not delete
the figure files manually:
cache=3 means to cache the text output of a chunk; none of
the output hooks will be called when the document is recompiled, and the
plots will not be redrawn, either:
Below is a test case for #588:
pairs(matrix(rnorm(100), ncol=100), labels=1:100, pch='.')
Another test case, with more plots:
Sys.sleep(5) plot(1:10) abline(0, 1) plot(2:11)
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