apollo_firstRow: Keeps only the first row for each individual

In apollo: Tools for Choice Model Estimation and Application

Keeps only the first row for each individual

Description

Given a multi-row input, keeps only the first row for each individual.

Usage

apollo_firstRow(P, apollo_inputs)

Arguments

P	List of vectors, matrices or 3-dim arrays. Likelihood of the model components (or other object).
apollo_inputs	List grouping most common inputs. Created by function apollo_validateInputs.

Details

This a function to keep only the first row of an object per indidividual. It can handle multiple types of components, including scalars, vectors and three-dimensional arrays (cubes). The argument database MUST contain a column called 'apollo_sequence', which is created by apollo_validateData.

Value

If P is a list, then it returns a list where each element has only the first row of each individual. If P is a single element, then it returns a single element with only the first row of each individual. The size of the element is changed only in the first dimension. If input is a scalar, then it returns a vector with the element repeated as many times as individuals in database. If the element is a vector, its length will be changed to the number of individuals. If the element is a matrix, then its first dimension will be changed to the number of individuals, while keeping the size of the second dimension. If the element is a cube, then only the first dimension's length is changed, preserving the others.

apollo documentation built on Oct. 2, 2024, 1:08 a.m.