Download Isomap Faces

Download the original Isomap face-pose dataset.

Usage

download_isomap_faces(url = isomap_faces_url, verbose = FALSE, timeout = 1800)

Format

A data frame with 698 rows and 4,098 variables:

px1, px2, px3 ... px4096: Grayscale pixel values for a 64 x 64 image.
pose1, pose2: Pose values supplied with the original dataset.

Arguments

url: URL of the compressed 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 face-pose dataset.

Details

The original Stanford URL for this dataset is no longer available, so the default URL uses an archived copy from the Internet Archive. The archived data is stored as a Unix compress file, and this function uses an external gzip or uncompress command for decompression.

Note

Requires the R.matlab package to be installed. The face data also requires an external gzip or uncompress command that can decompress Unix compress files.

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{
faces <- download_isomap_faces()
show_isomap_face(faces, 1)
} # }