Array from structs in a workspace
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Andrew
am 15 Aug. 2020
Bearbeitet: Andrew
am 17 Aug. 2020
Good day.
I’m a little bit mixt up with chars, doubles, operands, and so on…
1st. I’m loading a bunch of structs from directory to workspace.
files=dir('C:\...\*.mat');
for i=1:length(files)
load(files(i).name);
end
I want to make from them an array.
array=[name1 name2 ... name118]
This method produces expected outcome – a struct 1x118. The only undesirable thing is to type all the 118 names “manually”.
I trade some “shortcuts”…
array = files;
Produces incorrect array 118x1 with some data about files, not their fields.
array =(files(i).name);
Asks to check for missing argument or incorrect argument data type in call to further function 'struct2cell'.
array =(1:files(i).name);
Error due to colon operator with char operands, first and last operands must be char.
Search in manuals and “ask” section is still in progress. Who – also can't fit, because at that point of the script are additional/not .mat variables (files and i) in workspace.
Maby someone has a hint on how I could avoid typing in “manual”?
2 Kommentare
Walter Roberson
am 16 Aug. 2020
Do each of the files have exactly the same variable names in exactly the same order?
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Walter Roberson
am 16 Aug. 2020
Bearbeitet: Walter Roberson
am 16 Aug. 2020
projectdir = 'C:\...';
dinfo = dir( fullfile(projectdir, '*.mat') );
filenames = fullfile( {dinfo.folder}, {dinfo.name} );
for i = length(files) : -1 : 1
array(1,i) = load(filenames{i});
end
The backwards loop is for efficiency, as it initializes the struct to full size and so does not need to keep extending the struct like you would if you looped forwards.
4 Kommentare
Walter Roberson
am 17 Aug. 2020
cells{i} = orderfields(load(filenames{i})); %sorts fields in ASCII order
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