You can use the Matrix Dimension and Labels dialog to control the number of rows and columns, the X / Y column and row mapping arrangement, and the X / Y column headers, for all matrix objects in a given matrix sheet. Alternately, you can use the mdim X-Function to set the dimensions and coordinates.
Row and column numbers are positive integers. They determine the number of cells in the matrix. If a matrix is a numeric matrix, you can use this dialog to change the dimension. However, you cannot change the dimensions for images. To tell whether a matrix is an image matrix or a numeric matrix, you can resort to the layer icon. If a matrix object is an image, its object icon will be 
. Otherwise, it will be 
.
To open the dialog, select Matrix: Set Dimension/Labels from the menu.
Enter the number of columns (X dimension) and rows (Y dimension) in the associated text boxes.
Type the first and last X / Y values in the associated text boxes under the XY Mapping tab.
The X and Y coordinates of matrix data are assumed to be evenly spaced. The first X is mapped to the first matrix column and the last X is mapped to the last matrix column. The X coordinates of other columns will be linearly mapped. Similar mapping applies to rows, but the first Y and the last Y are used. For a point that corresponds to a matrix cell, its position in 3D space is determined by the X and Y coordinates of this cell, as well as the Z-value that is saved in the cell. When matrix data is plotted or analyzed, the XY coordinates, instead of the column and row numbers, will be used.
Enter the Long Name, Units, or Comments for X / Y / Z coordinates under the X Labels, Y Labels or Z Labels tab. X / Y /Z Labels can be used as X / Y /Z axis labels in 3D graphs. For detailed information about the Z Labels tab, please refer to matrix object headers.