1. TransCAD
Working with Matrices
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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.
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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.
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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.
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5. To Create a New Matrix File
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7. To Add a Matrix to a Matrix File
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8. To Change the Matrix Labels
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9. To Display Matrix Row and Column Marginals
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11. To Sort a Matrix View
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12. To Find a Cell in a Matrix
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13. To Change the Font, Format, and Other Settings
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14. To Fill Cells with a Single Value
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16. To Fill a Matrix Cell by Cell
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17. To Fill a Matrix with a Formula
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18. To Fill a Matrix Using Vector Multiplication
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19. To Update a Matrix
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20. To Append Matrices to a Matrix File
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21. To Sum All the Matrices in a Matrix File
Summarize two Matrices
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22. To Add a Matrix Index
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23. To Display a Portion of a Matrix
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24. To Create Desire Lines (Desire.wrk)
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26. To Impost a Dataview into a Matrix
Activate a dataview first
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28. To Export a Matrix to a New Table
Activate a Matrix first
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29. To Copy a Matrix File
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30. To Transpose a Matrix File
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31. To Combine Matrix Files
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32. To Perform Matrix Multiplication
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33. 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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