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I am trying to create a table in R Markdown, where values for each table row are generated inside of a for-loop inside of a code chunk.

Within the code chunk, I loop through a dataframe and calculate values for each output row. Each row has exactly the same format: first element is a text string, followed by 3 integers.

I've tried two different ends of the solution-spectrum for this problem...

  1. After each iteration of the loop, put the calculated values for one row into an R matrix. When the loop has completed, directly write out the matrix in one step with the cat command. However, the result of this method does not look like a table at all; all of the values appear in what appears to be a single "vector" or "list".
  2. In results='asis' mode, as each iteration of the loop executes, write out raw HTML table rows with specified widths. Here, I at least get the right format, but am unable to control the column-widths. TR WIDTH=80 produces a result that takes up only about 1/3 of the output area.

I suspect their is a better solution strategy, than tinkering with the two ideas above. Does anyone have any suggestions as to a best practice here?

NaiveBayesian
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  • 1. In R a `matrix` can only hold one type of elements i.e. it is impossible to have a matrix where the first column is a string and the remaining columns are of type integer. What you are getting with your approach is a matrix of type `character`. I'd suggest using a `data.frame` instead 2. You did not specify what you are using for formatting the table. You could/should provide a [minimal reproducible example](https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example/5963610#5963610). That way you can help others to help you! – dario Oct 09 '21 at 12:50

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