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**tourr**: Implement Tour Methods in R Code**lda_pp**: LDA projection pursuit index.

# LDA projection pursuit index.

### Description

Calculate the LDA projection pursuit index. See Cook and Swayne (2007) Interactive and Dynamic Graphics for Data Analysis for equations.

### Usage

1 | ```
lda_pp(cl)
``` |

### Arguments

`cl` |
class to be used. Such as "color" |

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- anaglyph: Draw anaglyphs with base graphics.
- andrews: Compute Andrews' curves
- animate: Animate a tour path.
- bases_little: Generate bases for the little tour
- basis_init: Generate initial basis.
- basis_nearby: Generate nearby bases, e.g. for simulated annealing.
- basis_random: Generate a random basis
- blank_plot: Set up a blank plot to display data projections
- center: Center a numeric vector by subtracting off its mean.
- check_freezer_safe: Check matrix is a valid frozen matrix
- cmass: Central mass index.
- dependence_tour: A dependence tour path.
- display_andrews: Andrews' curves tour path animation.
- display_depth: Display 3d projection with depth cues
- display_dist: 1d distribution tour path animation.
- display_faces: Chernoff faces tour path animation.
- display_image: Image tour path animation.
- display_pcp: Parallel coordinates tour path animation.
- display_scatmat: Scatterplot matrix tour path animation.
- display_stars: Star glyph tour path animation.
- display_stereo: Anaglpyh tour path animation.
- display_trails: Display tour path with trails
- display_xy: Display tour path with a scatterplot
- draw_tour_axes: Draw tour axes with base graphics
- find_best_dir: Find the most promising direction to travel in.
- find_best_frozen_dir: Find most promising direction in frozen space.
- find_frozen_path_peak: Find most highest peak along frozen geodesic.
- find_path_peak: Find the most interesting projection along a geodesic.
- find_platform: Find the platform Find the platform being used by the user
- Flea-measurements: Flea beatle measurements
- freeze: Freeze and thaw matrices
- frozen_guided_tour: The frozen guided tour
- frozen_tour: A frozen tour path.
- geodesic_info: Calculate information required to interpolate along a...
- geodesic_path: Generate geodesic path.
- grand_tour: A grand tour path.
- guided_tour: A guided tour path.
- holes: Holes index.
- interpolate: Interpolate geodesically between bases.
- is_orthonormal: Test if a numeric matrix is orthonormal.
- Laser-measurements: Turnable laser measurements from Bellcore
- lda_pp: LDA projection pursuit index.
- little_tour: A little tour path.
- local_tour: A local tour path.
- new_geodesic_path: Generate a geodesic path between bases supplied by generator
- new_tour: Create a new tour.
- normalise: Normalise a numeric matrix.
- Olive-oil-measurements: Olive oil samples from Italy
- orthonormalise: Orthonormalise using modified Gram-Schmidt process.
- orthonormalise_by: Orthonnormalise one matrix by another.
- Ozone-measurements: Monthly ozone measurements over Central America
- path_curves: Draw the path that the geodesics took.
- path_dist: Compute distance matrix from bases.
- path_index: Compute index values for a tour history.
- paths_index: Compute index value for many histories.
- pda_pp: PDA projection pursuit index.
- Places-Ratings: Ratings of different locations across North America
- planned_tour: A planned tour path.
- plot.path_curve: Plot history curves.
- plot.path_index: Plot history index with ggplot2.
- proj_dist: Calculate the distance between two bases.
- project3d: Stereographic projection
- Rat-CNS: Rat CNS Gene Expression
- render: Render frames of animation to disk
- rescale: Rescale a matrix or data frame
- save_history: Save tour history.
- search_better: Search for a better projection near the current projection.
- search_better_random: Search for better projection, with stochastic component.
- search_frozen_geodesic: Search for most interesting projection along frozen...
- search_geodesic: Search for most interesting projection along random...
- sphere: Sphere a matrix (or data frame) by transforming variables to...
- step_angle: Step along an interpolated path by angle in radians.
- step_fraction: Step along an interpolated path by fraction of path length.
- to_stop: Prints information on how to stop the output
- Tropical-Atmosphere-Ocean: Tropical Atmosphere Ocean data
- xnul: A null function