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TransCAD

TransCAD. Working with Matrices. Matrices.

michaelj
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TransCAD

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  1. TransCAD Working with Matrices

  2. 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.

  3. 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.

  4. 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.

  5. To Create a New Matrix File

  6. To Add a Matrix to a Matrix File

  7. To Change the Matrix Labels

  8. To Display Matrix Row and Column Marginals

  9. To Sort a Matrix View

  10. To Find a Cell in a Matrix

  11. To Change the Font, Format, and Other Settings

  12. To Fill Cells with a Single Value

  13. To Fill a Matrix Cell by Cell

  14. To Fill a Matrix with a Formula

  15. To Fill a Matrix Using Vector Multiplication

  16. To Update a Matrix

  17. To Append Matrices to a Matrix File

  18. To Sum All the Matrices in a Matrix File Summarize two Matrices

  19. To Add a Matrix Index

  20. To Display a Portion of a Matrix

  21. To Create Desire Lines (Desire.wrk)

  22. To Impost a Dataview into a Matrix Activate a dataview first

  23. To Export a Matrix to a New Table Activate a Matrix first

  24. To Copy a Matrix File

  25. To Transpose a Matrix File

  26. To Combine Matrix Files

  27. To Perform Matrix Multiplication

  28. 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

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