在Matlab中将datenum转换为datetime的最快方法 [英] Quickest method to convert datenum to datetime in Matlab

问题描述

我在Matlab中将datenum转换为datetime时遇到问题。

I am having issue converting datenum to datetime in Matlab.

给定 dnum = [floor（now）; floor（now + 1）];

我尝试了以下操作：

datenum(dnum)

但这没用。

我发现工作的方式是：

datetime(datestr(dnum)) % seems slow?
datetime(year(dnum), month(dnum), day(dnum)) % slower?

最快的方法是什么，还有更好的方法吗？内置函数？

What is the quickest way and are there better methods? Built-in functions?

推荐答案

在尝试了一些建议之后，细分如下：

After experimenting with a couple of suggestions, this is the breakdown:

dnum = datenum(datetime(1900,1,1):datetime(2017,1,1))';

然后是结果（Matlab 2016b）：

Then these are the results (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：

Here is the function for copy/paste:

function dtime = datenum2datetime(dnum)
    dtime = datetime(dnum,'ConvertFrom','datenum');
end

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