| Library: | xplore |
| See also: | read write readascii writem |
| Quantlet: | readm | |
| Description: | readm reads mixed data from a file. |
| Usage: | z = readm (filename {, separators, multisep, rrow, rcol, onlytype}) | |
| Input: | ||
| filename | name of the data file | |
| separators | an optional string that contains the data separator (default = " \t\n"); if the string is empty, the default value is used | |
| multisep | an optional scalar, more separators following each other are consider as one if it is non-zero (default = 1) | |
| rrow | an optional p1 x 2 matrix (if you enter a scalar, it will be ignored) specifies, which rows should be read. Every row consists of two numbers, r1 and r2: 1) if both numbers are positive, they specify that rows with indices {r1,...,r2} should be read in; 2) if both number are negative, they specify that rows with indices {|r1|,...,|r2|} should be excluded from reading; 3) it is not possible to mix inclusion and exclusion conditions. If the parameter is omitted or is a scalar, all rows are read. | |
| rcol | an optional p2 x 2 matrix (if you enter a scalar, it will be ignored) specifies, which columns should be read. Every column consists of two numbers, r1 and r2: 1) if both numbers are positive, they specify that columns with indices {r1,...,r2} should be read in; 2) if both number are negative, they specify that columns with indices {|r1|,...,|r2|} should be excluded from reading; 3) it is not possible to mix inclusion and exclusion conditions. If the parameter is omitted or is a scalar, all columns are read. | |
| onlytype | an optional scalar; if entered, the quantlet assumes that all columns have the type given by this parameter (0 stands for numbers and 1 for strings) | |
| Output: | ||
| z.type | (p+q) vector, types of columns in file | |
| z.double | n x p matrix, numerical vectors; this component equals zero if p == 0, i.e., when there are no numerical columns in the file | |
| z.text | n x q matrix, text vectors; this component contains an empty string if q == 0, i.e., when there are no text columns in the file | |
1 2 3 4 hallo 4.5 .
5 6 7.0 0 hallo_again 6.7 8.9
The first four columns will be recognized as numbers. The fifth vector is a text vector; if the text is enclosed in apostrophes blanks can be incorporated in the text. The last two vectors are float vectors again. A single dot will be interpreted as NAN.
The columns and rows specified by matrices rcol and rrow are read and output in the same order as they are in the file, i.e., as if the entries of rcol and rrow are sorted.
library("xplore")
readm("mixed.dat")
Contents of string [1,] "readm: Found 2 line(s) and 7 column(s)" Contents of z.type [1,] 0 [2,] 0 [3,] 0 [4,] 0 [5,] 1 [6,] 0 [7,] 0 Contents of z.double [1,] 1 2 3 4 4.5 +NAN [2,] 5 6 7 0 6.7 8.9 Contents of z.text [1,] "hallo" [2,] "hallo_again"
library("xplore")
readm("mixed.dat", "", 1, 0, 5~7)
The same example as before, but now the fifth to the seventh column are read. Notice that the separator is an empty string, so that the default separators are used. Contents of string [1,] "readm: Found 2 line(s) and 3 column(s)" Contents of z.type [1,] 1 [2,] 0 [3,] 0 Contents of z.double [1,] 4.5 +NAN [2,] 6.7 8.9 Contents of z.text [1,] "hallo" [2,] "hallo_again"