TransCAD Working with Matrices 2019/4/29

Matrices Matrices can contain data that are essential for transportation applications, but do not fit comfortably into spreadsheets or databases. TransCAD provides a broad and powerful set of tools for storing, displaying, editing, and manipulating data in matrix form. A Matrix contains rows and columns. Each row is identified by a row ID, and each column by a column ID. Each entry in the matrix is called a cell and has a value that describes something about the row and column. 2019/4/29

Matrices TransCAD stores matrices in a matrix file. A matrix file contains one or more matrices, each of which contains the exact same set of rows and columns. You can use TransCAD to create, modify, and edit matrix files of any size. In addition, many TransCAD modes and procedures create matrix files as output. For example: The multiple shortest path procedure can create a matrix file showing the distance between a set of origins and a set of destinations. 2019/4/29

Creating Matrices You create a new, empty matrix file by choosing the following: The layer or dataview on which the matrix file is built The dataview field you want to use to identify the rows and columns of the matrix file Which features or records from the dataview should appear in the matrix file You must choose one numeric field from the layer or dataview to use as the ID for the rows and columns of the matrix file. 2019/4/29

To Create a New Matrix File 2019/4/29

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To Add a Matrix to a Matrix File 2019/4/29

To Change the Matrix Labels 2019/4/29

To Display Matrix Row and Column Marginals 2019/4/29

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To Sort a Matrix View 2019/4/29

To Find a Cell in a Matrix 2019/4/29

To Change the Font, Format, and Other Settings 2019/4/29

To Fill Cells with a Single Value 2019/4/29

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To Fill a Matrix Cell by Cell 2019/4/29

To Fill a Matrix with a Formula 2019/4/29

To Fill a Matrix Using Vector Multiplication 2019/4/29

To Update a Matrix 2019/4/29

To Append Matrices to a Matrix File 2019/4/29

To Sum All the Matrices in a Matrix File Summarize two Matrices 2019/4/29

To Add a Matrix Index 2019/4/29

To Display a Portion of a Matrix 2019/4/29

To Create Desire Lines (Desire.wrk) 2019/4/29

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To Impost a Dataview into a Matrix Activate a dataview first 2019/4/29

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To Export a Matrix to a New Table Activate a Matrix first 2019/4/29

To Copy a Matrix File 2019/4/29

To Transpose a Matrix File 2019/4/29

To Combine Matrix Files 2019/4/29

To Perform Matrix Multiplication 2019/4/29

Options for Storing Matrix TransCAD has a number of options for how matrices are stored and accessed. When you are creating a new matrix file you may want to use these options to reduce the disk space requirements for large matrix files, or to increase the speed of access for certain operations. There are four settings you can control: How values are stored in the file Whether values are loaded into memory or accessed from disk Whether the values are stored in a compact or expanded format Whether values are stored in row or column order 2019/4/29