How to extract data by looping through struct
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Hi - I have some data saved as .mat files and i am trying to load it in (think I have done this) and then loop through the data in the struct to plot it all on the same graph (to then plot the mean average also.) Here is my script that doesn't work:
S = dir(fullfile(outputDir,'*.mat'));
fields = fieldnames(S)
for k = 1:length(fields)
F = fullfile(outputDir,S(k).name);
S(k).data = load(F);
S.(fields{k});
%a = table2array(readtable(strcat(S(outputFolders).folder,'/', S(outputFolders).name)));
for j= 1:length(S.data);
%for i = 1:length(preSumTypesoutput)
plot([-6 -5 -4 -3 -2 -1], data(:,i)); hold on;
xticks([-6 -5 -4 -3 -2 -1])
ylim([0 10])
ylim([0 5])
title('Pre-arousal vocalisations')
end
end
and I attach some example data (I am trying to plot 6 of these).
采纳的回答
Walter Roberson
2022-9-13
S = dir(fullfile(outputDir,'*.mat'));
S is the output of dir()
fields = fieldnames(S)
The field names returned by dir() include such items as 'name', 'folder', 'bytes', 'isdir' and so on.
for k = 1:length(fields)
You want to loop over the directory structure... unusual, but maybe there is a reason
F = fullfile(outputDir,S(k).name);
You are using the field name index for the directory structure, and using it to index the struct array returned by dir() . If you wanted to loop over the fields of S you would need to use something like
thisfield = {S.(fields{K})};
3 个评论
Walter Roberson
2022-9-13
I recommend that you read http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F
Walter Roberson
2022-9-13
S = dir(fullfile(outputDir,'*.mat'));
filenames = fullfile({S.folder}, {S.name});
num_files = length(filenames);
tiledlayout('flow');
for K = 1 : num_files
thisfile = filenames{K};
[~, basename, ~] = fileparts(thisfile);
datastruct = load(thisfile);
data = datastruct.preSumTypesoutput; %fixed field name!!
nexttile();
plot([-6 -5 -4 -3 -2 -1], data);
xticks([-6 -5 -4 -3 -2 -1])
ylim([0 10])
ylim([0 5])
title("Pre-arousal vocalisations for " + basename)
end
Emu
2022-9-13
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