R: Converting string to number (Matlab style)

str2num {pracma} | R Documentation

## Converting string to number (Matlab style)

### Description

Functions for converting strings to numbers and numbers to strings.

### Usage

    str2num(S)
    num2str(A, fmt = 3)

### Arguments

`S` | string containing numbers (in Matlab format).
`A` | numerical vector or matrix.
`fmt` | format string, or integer indicating number of decimals.

### Details

`str2num` converts a string containing numbers into a numerical object. The string can begin and end with '[' and ']', numbers can be separated with blanks or commas; a semicolon within the brackets indicates a new row for matrix input. When a semicolon appears behind the braces, no output is shown on the command line.

`num2str` converts a numerical object, vector or matrix, into a character object of the same size. `fmt` will be a format string for use in `sprintf`, or an integer `n` being used in `'%.nf'`.

### Value

Returns a vector or matrix of the same size, converted to strings, respectively numbers.

### See Also

`sprintf`

### Examples

    str1 <- " [1 2 3; 4, 5, 6; 7,8,9]  "
    str2num(str1)
    # matrix(1:9, nrow = 3, ncol = 3, byrow = TRUE)

    # str2 <- " [1 2 3; 45, 6; 7,8,9]  "
    # str2num(str2)
    # Error in str2num(str2) :
    #   All rows in Argument 's' must have the same length.

    A <- matrix(c(pi, 0, exp(1), 1), 2, 2)
    B <- num2str(A, 2); b <- dim(B)
    B <- as.numeric(B); dim(B) <- b
    B
    #      [,1] [,2]
    # [1,] 3.14 2.72
    # [2,] 0.00 1.00

[Package pracma version 2.0.4 Index]