Iteration intro
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@ -16,3 +16,7 @@ data using the R programming environment
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** Reading data
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* [[./script/extractpdf.R][Reading pdf files]]
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** Iteration
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* [[./script/iteration.R][Lapply, apply and for loop: brief introduction]]
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@ -0,0 +1,52 @@
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#' ---
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#' title: "Iteration in R"
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#' date: "2021-12-04"
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#' author: "Jose https://ajuda.multifarm.top"
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#' output:
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#' html_document:
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#' code_folding: show
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#' toc: yes
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#' toc_float:
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#' smooth_scroll: true
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#' df_print: paged
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#' highlight: zenburn
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#' ---
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#' remove objects
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#'
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objects()
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rm(list = ls())
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#' data
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data(sleep)
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str(sleep)
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#' ## for loop
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#'
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#' for( var in seq ) expr
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#' Where 'var' us a name and 'seq' is a vector and 'expr' an expression
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for(j in names(sleep)) print(class(names(sleep)))
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sapply(sleep, class)
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lapply(sleep, class)
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## The language has other iteration operators (while() and repeat), and
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## the usual conditional operators (if ... else).
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#' Check package 'SoDA'
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#' ## References
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#'
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#' John M. Chambers. Software for Data Analysis: Programming with R.
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## @book{chambers2008software,
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## title={Software for data analysis: programming with R},
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## author={Chambers, John M},
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## volume={2},
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## year={2008},
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## publisher={Springer}
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## }
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