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import time and data from excel

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roblocks
roblocks 2016-5-26
评论： roblocks 2016-5-26
Dear All,
I am facing a seemingly simple problem. I have data in the following format:
date var
01.01.2000 13
01.04.2000 15
...
in Excel and want to import it in Matlab such that date becomes a date vector and var a numbers vector. The matlab import function and another thread in this forum led me to:
[~, ~, raw] = xlsread('\data\sandbox.xlsx','Tabelle1','A2:B9');
raw(cellfun(@(x) ~isempty(x) && isnumeric(x) && isnan(x),raw)) = {''};
cellVectors = raw(:,1);
raw = raw(:,2);
data = reshape([raw{:}],size(raw));
date1 = cellVectors(:,1);
ARBANS010010 = data(:,1);
clearvars data raw cellVectors;
str = datestr( date1, 'DD/MM/YYYY' );
num = datenum( str,'DD/MM/YYYY' );
which produces an error. A minimum example is attached to this post. If you download the excel file and run my code you should get the same error. I am somewhat confused. My dates are not even in a weird format or something. Looks like a straight forward thing to do for matlab?
If anyone can produce code that succesfully imports the data or points me towards what I fail at seeing here, I would really appreciate it!
Thanks in advance!

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回答（1 个）

Andrei Bobrov
Andrei Bobrov 2016-5-26
[n,st] = xlsread('sandbox.xlsx',1,'A2:B9');
out = [datenum(st,'dd.mm.yyyy'),n];
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roblocks
roblocks 2016-5-26
ah I think I now what you mean:
[n,st] = xlsread('\data\sandbox.xlsx',1,'A2:B9');
time = datenum(st,'dd.mm.yyyy');
date_d = datetime(time, 'ConvertFrom', 'Excel', 'Format', 'mm/dd/yyyy');
So finally I am now trying to get it in quarterly format. Changing to q/yyyy messes things up though.
roblocks
roblocks 2016-5-26
It is weird.
[n,st] = xlsread('\data\sandbox.xlsx',1,'A2:B9');
time = datenum(st,'dd.MM.yyyy');
a= datevec(time)
c=datetime(a, 'Format', 'dd/MM/yyyy')
Now c is different from st... somehow it loses information along the way...

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