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Download Isomap Swiss Roll

Source: R/isomap.R
download_isomap_swiss_roll.Rd

Download the original Swiss-roll dataset used in Isomap examples.

Usage

download_isomap_swiss_roll(
  url = isomap_swiss_roll_url,
  verbose = FALSE,
  timeout = 1800
)

Format

A data frame with 20,000 rows and 6 variables:

  • x, y, z: Coordinates of the points in the rolled three-dimensional space.

  • u, v: Coordinates of the points in the unrolled two-dimensional space.

  • color: A string representing a color in hex format, generated from u.

Arguments

url

URL of the Matlab data file.

verbose

If TRUE, then download progress will be logged as a message.

timeout

Minimum download timeout in seconds. The default is 30 minutes; a larger existing global R timeout is preserved.

Value

Data frame containing the Isomap Swiss-roll dataset.

Details

The live MIT URL for this dataset is no longer available, so the default URL uses an archived copy from the Internet Archive.

Note

Requires the R.matlab package to be installed.

References

Tenenbaum, J. B., de Silva, V., & Langford, J. C. (2000). A global geometric framework for nonlinear dimensionality reduction. Science, 290(5500), 2319-2323.

Examples

if (FALSE) { # \dontrun{
swiss <- download_isomap_swiss_roll()
plot(swiss$x, swiss$y, col = swiss$color, pch = 20, cex = 0.1)
} # }