Possible bug in struct2table()

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Mohammad Abouali
Mohammad Abouali 2016-4-6
评论： Peter Perkins 2018-10-1
When I try to convert a single structure to array using struct2table() I get an error.
But if I have an array of that structure it works just fine.
Try the following code:
load singleStruct.mat
% This ends up in error
try
myTBL = struct2table(singleStruct);
catch
disp('I told you this ends up in error.');
end
% This wont end up in Error
structArray(1) = singleStruct;
structArray(2) = singleStruct;
myTBL = struct2table(structArray);
I have attached the singleStruct.mat for you guys to try.
Any work around?
Well, I usually have an array of those structure, this is really an special case that it is only one.

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采纳的回答

Matthew Eicholtz
Matthew Eicholtz 2016-4-6
编辑：Matthew Eicholtz 2016-4-6
You may have already noticed this, but the error is due to having fields with an unequal number of rows. When you pass a scalar structure as input to struct2table(), it expects every row to be a different row in the table. This is problematic if the number of rows for each field varies.
In your provided data, it looks like there are three fields causing this problem: ELEVB, ELEVB_FR, and SNOEB.
One simple workaround is to encapsulate those fields into 1x1 cell arrays.
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Austin Healy
Austin Healy 2018-9-20
Thanks for the explanation and now that I see AsArray I'll remember to set it. I understand your point but frankly, I think the default value for AsArray should be true. In a programmatic setting I can't think of a situation where I would so radically want to change behavior when I happen to have a scalar array
Peter Perkins
Peter Perkins 2018-10-1
That's why the parameter exists. Interactively, it would be a pain to type all that. Programmatically, it's a good idea for the reason you cite. It's similar to "always use the DIM argument to the mean function when you are writing a script or function that will be reused."

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Lukas
Lukas 2017-4-26
As this error only occurs with (1x1) structs, there is a simple workaroud. To convert a struct into a table, use the following code:
largeStruct = repmat(struct,2,1);
table = struct2table(largeStruct);
table = table(1,:);

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