How to initialize a vector with fixed length in R

Question

How to initialize a vector with fixed length in R     For example  I want a vector of characters with length of 10

User · Answer

The initialization method easiest to remember is

vec = vector(,10); #the same as "vec = vector(length = 10);"

The values of vec are: "[1] FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE" (logical mode) by default.

But after setting a character value, like

vec[2] = 'abc'

vec becomes: "FALSE" "abc" "FALSE" "FALSE" "FALSE" "FALSE" "FALSE" "FALSE" "FALSE" "FALSE"", which is of the character mode.

User · Answer

If you want to initialize a vector with numeric values other than zero  use rep  n  lt - 10 v  lt - rep 0 05  n  v   which will give you    1  0 05 0 05 0 05 0 05 0 05 0 05 0 05 0 05 0 05 0 05

User · Answer

Just for the sake of completeness you can just take the wanted data type and add brackets with the number of elements like so   x  lt - character 10

User · Answer

vector  X  lt - vector mode  character   length 10    This will give you empty strings which get printed as two adjacent double quotes  but be aware that there are no double-quote characters in the values themselves  That s just a side-effect of how print default displays the values  They can be indexed by location  The number of characters will not be restricted  so if you were expecting to get 10 character element you will be disappointed    gt   X 5   lt -  character element in 5th position    gt   X   1                                                                            3                                                                            5   character element in 5th position                                        7                                                                            9                                           gt   nchar X    1   0  0  0  0 33  0  0  0  0  0   gt  length X   1  10

[r] How to initialize a vector with fixed length in R

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