Converting string to number (Matlab style)
Functions for converting strings to numbers and numbers to strings.
str2num(S) num2str(A, fmt = 3)
S |
string containing numbers (in Matlab format). |
A |
numerical vector or matrix. |
fmt |
format string, or integer indicating number of decimals. |
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'.
Returns a vector or matrix of the same size, converted to strings, respectively numbers.
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
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