R for Data Analysis in easy steps 2nd Edition by Mike McGrath

Author:Mike McGrath
Language: eng
Format: epub
Publisher: In Easy Steps
Published: 2023-06-02T00:00:00+00:00

Note that the matrix is created with two indices – denoting rows first then columns second.

Transposing data

When creating a matrix, the matrix( ) function will, by default, insert the data you supply into cells arranged by column order. This means that cells in the first column will be filled with data from the elements at the beginning of the specified vector before filling the second column, then the third column, and so on.

If you prefer to control how the cells are filled with data, you can include a byrow= argument in the call to the matrix( ) function. When this is assigned a TRUE value, the function will then insert the data you supply into cells arranged by row order. Cells in the first row will now be filled with data from the elements at the beginning of the specified vector, before filling the second row, then the third row, and so on. Assigning a FALSE value to the byrow= argument will insert the data you supply into cells arranged by column order – the default order.

The arrangement of cells in a matrix can also be transposed, so that the rows become columns and the columns become rows, simply by specifying the matrix name to the built-in t( ) function.

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