how to create a quoted expression from strings

Question

Given a vector of strings, I would like to create an expression without the quotation marks.

# eg, I would like to go from 
c(\"string1\", \"string2\")

# to...         


        

Answer 1

I found these answers helpful but incomplete for using variables and multiple lines within the expression. To create a quoted expression from strings, with variables and multiple lines make use of quote(), atop() and subsititute():

  # Prepare variables
  samp_skewness = round(skewness(dv),2)
  samp_kurtosis = round(kurtosis(dv),2)
  samp_var = round(var(dv))
  samp_summ <- summary(dv)
  num_samples = length(dv)

  # Prepare quotes containing math annotations
  q1 = quote(paste(mu,"="))
  q2 = quote(paste(sigma,"="))
  q3 = quote(paste(gamma[1],"="))
  q4 = quote(paste(gamma[2],"="))

# Use subsitition to construct the expression, passing in the variables and quoted expressions
  title = substitute(atop(paste("Top Title, # samples: ", ns), 
            paste(e1,v1,", ",e2,v2,", ",e3,v3,", ",e4,v4)),
            list(ns=num_samples,v1=round(samp_summ['Mean']),v2=samp_var,
            v3=samp_skewness,v4=samp_kurtosis,e1=q1,e2=q2,e3=q3,e4=q4))

In ggplot: ...

labs(title = title) +

...