我在 Matlab 中将日期编号转换为日期时间时遇到问题。
给定dnum = [floor(now); floor(now+1)];
我尝试了以下方法:
datenum(dnum)
但这并没有奏效。
我发现这项工作的方式是:
datetime(datestr(dnum)) % seems slow?
datetime(year(dnum), month(dnum), day(dnum)) % slower?
什么是最快的方法,有更好的方法吗?内置函数?
在尝试了一些建议之后,这是细分:
dnum = datenum(datetime(1900,1,1):datetime(2017,1,1))';
然后这些是结果(Matlab 2016b):
% Elapsed time is 1.287081 seconds.
tic
dtime = datetime(datestr(dnum)); % seems slow?
toc
% Elapsed time is 0.017474 seconds.
tic
dtime = datetime(year(dnum), month(dnum), day(dnum));
toc
% Elapsed time is 0.010327 seconds.
tic
dtime = datetime(datevec(dnum));
toc
% Elapsed time is 0.000949 seconds.
tic
dtime = datetime(dnum,'ConvertFrom','datenum');
toc
这是复制/粘贴的功能:
function dtime = datenum2datetime(dnum)
dtime = datetime(dnum,'ConvertFrom','datenum');
end