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ONLY load matfiles that contain a variable

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James hall
James hall 2013-4-22
Hi Guys,
I want to detect if a .mat file contains a variable before the script loads it. for the script that I am writing I only want one data set and there are 8297 files to check, so to save time and prevent crashes I only want to load faultsActiveList. However because there are not always faults active it is not always present.
DATA = load(MATfile,'faultsActiveList')
please bear in mind allthough I am the author of many of the scripts I use I do use some that others in my company wrote and they are p.coded so I cannot effect how the data comes to me.
Many Thanks James

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采纳的回答

Friedrich
Friedrich 2013-4-22
编辑：Friedrich 2013-4-22
Hi,
you can use whos to see if there are any variables in the mat file and which ones:
info = whos('-file','myfile.mat')
info will be a structure of size nx1 where n is the amount of variables in the matfile. In addition the field name will tell you the names of the variables in the mat file.
So you can do
info = whos('-file','myfile.mat')
if any(strcmp({info.name},'faultsActiveList'))
load('myfile.mat','faultsActiveList')
end

更多回答（1 个）

Walter Roberson
Walter Roberson 2013-4-22
if isempty(who('faultsActiveList', '-file', MATfile))
... not there ...
end

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