# str2num: Converting string to number (Matlab style) In pracma: Practical Numerical Math Functions

## Description

Functions for converting strings to numbers and numbers to strings.

## Usage

 ```1 2``` ```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.

`sprintf`

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16``` ```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 ```

### Example output

```     [,1] [,2] [,3]
[1,]    1    2    3
[2,]    4    5    6
[3,]    7    8    9
[,1] [,2]
[1,] 3.14 2.72
[2,] 0.00 1.00
```

pracma documentation built on Dec. 11, 2021, 9:57 a.m.