[R] print and execute functions in a package namespace

Michael Friendly friendly at yorku.ca
Tue Oct 30 14:37:19 CET 2012

Let's say I have a package that consists of a set of functions, fig1(), 
fig2(), fig3() ..., each of which
produces a plot, and perhaps some printed output,  e.g.,

fig1 <- function() plot(1:10)
fig2 <- function() plot(10:1)
fig3 <- function() {y<-sample(1:10,10); plot(y); y}

I'd like to produce a document (PDF or HTML) containing the listing of 
each function and its output,
using knittr.

I can execute a list of figures using something like

# print and run a figure function
onefig <- function(fig) {
     cat("Figure:") # how to get name of fig function?

lapply(list(fig1, fig2, fig3), onefig)

But I need to work with the names of the figure functions instead, 
something like

figlist <- paste0("fig", 1:3)

# using figure name
onefig2 <- function(fig) {
     cat("Figure:", fig, "\n")
     eval(parse((paste0(fig,'()'))))   # doesn't work

As well, I need to be able to find all functions in the package 
namespace matching a pattern.
Can someone help?

Michael Friendly     Email: friendly AT yorku DOT ca
Professor, Psychology Dept.
York University      Voice: 416 736-2100 x66249 Fax: 416 736-5814
4700 Keele Street    Web:   http://www.datavis.ca
Toronto, ONT  M3J 1P3 CANADA

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