str2num | R Documentation |
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.
sprintf
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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