promise already under evaluation: recursive default argument reference or earlier problems?

by

Formal arguments of the form x=x cause this. Eliminating the two instances where they occur we get the following. (The reason you can’t use x=x in the formal arguments of a function definition is that it first looks up the default argument within the function itself so using that form is telling it to use itself as the default but it has not been defined so that makes no sense and we get an error.)

f <- function(x, T) {
   10 * sin(0.3 * x) * sin(1.3 * x^2) + 0.001 * x^3 + 0.2 * x + 80 
}

g <- function(x, T, f. = f) {  ## 1. note f.
   exp(-f.(x)/T) 
}
 
test<- function(g. = g, T = 1) {  ## 2. note g.
   g.(1,T) 
}
 
test()
## [1] 8.560335e-37

More Related Contents:

  1. Select rows from a data frame based on values in a vector
  2. How can I plot with 2 different y-axes?
  3. What does “The following object is masked from ‘package:xxx'” mean?
  4. Select the top N values by group
  5. How to force R to use a specified factor level as reference in a regression?
  6. efficiently generate a random sample of times and dates between two dates
  7. Windows 7, update.packages problem: “unable to move temporary installation”?
  8. Create new dummy variable columns from categorical variable
  9. drop-down checkbox input in shiny
  10. How to generate a matrix of combinations
  11. Convert written number to number in R
  12. Write many files in a for loop
  13. Marker mouse click event in R leaflet for shiny
  14. predict.lm() in a loop. warning: prediction from a rank-deficient fit may be misleading
  15. Reverse datetime (POSIXct data) axis in ggplot
  16. How to make grouped layout in igraph?
  17. How to resolve spherical geometry failures when joining spatial data
  18. Extract text after “/” in a data frame column
  19. R: extracting “clean” UTF-8 text from a web page scraped with RCurl
  20. Creating (and Accessing) a Sparse Matrix with NA default entries
  21. add missing rows to a data table
  22. Calculate Euclidean distance matrix using a big.matrix object
  23. Deleting specific rows from a data frame
  24. How to convert a date from a character string?
  25. How do I close unused connections after read_html in R
  26. different colors for each bar in stacked bar graph – base graphics
  27. consolidating data frames in R
  28. Text-mining with the tm-package – word stemming
  29. Adding percentage labels on pie chart in R
  30. show multiple plots from ggplot on one page in r

Leave a Comment