[R] round and trailing zero

[Göran Broström]

Ah, thanks,

Göran

> 29 juli 2024 kl. 16:23 skrev Duncan Murdoch <murdoch.duncan using gmail.com>:
> 
> On 2024-07-29 10:06 a.m., Göran Broström wrote:
>> I have a "result":
>>  > hazards
>>          (60, 70]    (70, 80]    (80, 90]   (90, 100]
>> [1,] 0.046612937 0.115643783 0.273613266 0.450127975
>> Two issues: (i) Too many decimals, and (ii) it seems to be an 1x4
>> matrix, I only need the first row. (i):
>>  > haz <- round(hazards, 3)
>>  > haz
>>       (60, 70] (70, 80] (80, 90] (90, 100]
>> [1,]    0.047    0.116    0.274      0.45
>> As expected, the fourth element lost a trailing zero. I'll deal with
>> that, but first (ii):
>>  > haz[1, ]
>>   (60, 70]  (70, 80]  (80, 90] (90, 100]
>>      0.047     0.116     0.274     0.450
>> And the trailing zero is mysteriously recovered!
>> Is there some general rule governing this behaviour?
> 
> R uses the same format for every element in each column when printing a matrix or dataframe, and for every element in a vector.
> 
> Your first example had only one element per column.  If you had printed t(haz) you'd get numbers displayed like the second version, where haz[1,] converts that row to a vector.
> 
> Duncan Murdoch
>