"week.m" file disapeared

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Arnaud Melin
Arnaud Melin 2015-7-14
评论： Arnaud Melin 2015-7-15
I successfully used the built-in function "week.m" last week but it seems that the matlab file has now disapeared. When I try to use it (e.g. week(1)) I get the following error message: Undefined function 'week' for input arguments of type 'double'. I checked in the finance/calendar, all is there but not the week.m file nor the quarter.m..... Any idea how to recover it ?
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Arnaud Melin
Arnaud Melin 2015-7-14
Excatly, the doc exists but that's all (so at least I know I didn't dream about it).
Brendan Hamm
Brendan Hamm 2015-7-14
This has to do with how classes are defined. If the class is not loaded into memory, then one cannot access its methods (it's as if they are not on the path). But you can access the documentation as the doc is not searching the MATLAB path for a file of the given name like help and which do.

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采纳的回答

Brendan Hamm
Brendan Hamm 2015-7-14
Firstly, week is indeed a function which is included in base MATLAB for versions 2014b and later. It is meant to operate on a datetime variable and not on a numeric double and therefore you get this error. You can verify that it is indeed still installed with the following command:
which week -all
This will tell you the location of all of the instances of week which MATLAB finds.
What exactly are you trying to do with the function by passing a numeric value to the function?
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Brendan Hamm
Brendan Hamm 2015-7-14
If someone had added such a function, then it would've appeared on his search path when he called:
which week
So, I doubt this is the case. He likely either had a datetime variable and used week, or he had a serial date number and used weeknum.
Arnaud Melin
Arnaud Melin 2015-7-15
I used serial date number with week, but I'll convert serial date number into datetime type and it should be alright. Thanks guys !

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Titus Edelhofer
Titus Edelhofer 2015-7-14
编辑：Titus Edelhofer 2015-7-14
Hi,
EDIT: my answer below is not correct, but the comment explains what's going on.
Hmm, are you sure this is a MathWorks supplied file? I know of weekday (MATLAB) and weeknum (Financial Toolbox) but not of week ...?
Maybe you copied it from somewhere? And maybe it's just a path thing, i.e., the folder containing your week.m is not on the MATLAB search path.
Try to locate week.m on your disk and use pathtool to add the folder in MATLAB.
Titus
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Titus Edelhofer
Titus Edelhofer 2015-7-14
Sorry, I stumbled across this myself and now (with the help of the others) remember. As long as you haven't created any datetime object, the class definition is not loaded and therefore which doesn't find it. This works:
t = datetime
t =
14-Jul-2015 16:59:24
which week
C:\MATLAB\R2015a\toolbox\matlab\timefun\@datetime\datetime.m % datetime method
Brendan Hamm
Brendan Hamm 2015-7-14
Correct, which would require the class definition is loaded, but the doc command would not have this requirement.

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