This is a basic Rpad page. Hit the Calculate button to calculate the page. The page processes form elements and Rpad input blocks from top to bottom.

Here are some Rpad form inputs:

A: (these 2 inputs are R expressions)
B:
color: (this one is an R string)

Here is a block that does some calculations in R on the server:

cat("A + B =", A+B)
cat("\n")
cat("color = ", color)

Here is another block that makes a graph. This one's a textarea, so it is editable.