Error "Undefined function or variable"

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PaunBGD
PaunBGD 2021-9-18
评论： PaunBGD 2021-9-20
I am receiving one of the following error messages. How can I resolve this issue?
Undefined function or variable 'segment_list'.
Code:
labels = {'cheduepalle';'fame';'chevuoi';'basta'};
segment_counter = 1;
for data_counter=1:num_of_samples
currVideo = data_files(data_counter).Video;
for label_counter = 1: length(currVideo.Labels)
if ismember(currVideo.Labels(label_counter).Name, labels)
s = struct('videoID', data_counter, 'start',currVideo.Labels(label_counter).Begin, 'end', currVideo.Labels(label_counter).End, 'label', currVideo.Labels(label_counter).Name);
segment_list(segment_counter) = s;
segment_counter = segment_counter + 1;
end
end
end
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PaunBGD
PaunBGD 2021-9-18
Undefined function or variable 'segment_list'.
Error in main (line 287)
for idx = 1:length(segment_list)
Here is the code, starting from line 287:
for idx = 1:length(segment_list)
curr_face = [];
curr_lhand = [];
curr_rhand = [];
for Frameidx = segment_list(idx).start:segment_list(idx).end
curr_face = [curr_face; data_files(segment_list(idx).videoID).Video.Frames(Frameidx).Skeleton.PixelPosition(4,:)];
curr_lhand = [curr_lhand; data_files(segment_list(idx).videoID).Video.Frames(Frameidx).Skeleton.PixelPosition(8,:)];
curr_rhand = [curr_rhand; data_files(segment_list(idx).videoID).Video.Frames(Frameidx).Skeleton.PixelPosition(12,:)];
end
segment_list(idx).FaceArray = curr_face;
segment_list(idx).lHandArray = curr_lhand;
segment_list(idx).rHandArray = curr_rhand;
end
Cris LaPierre
Cris LaPierre 2021-9-18
It looks like segment_list never gets created. This could be because your for loops never end up running, or because your if conditional is never true. See Walter's reply below for more details.

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Walter Roberson
Walter Roberson 2021-9-18
Perhaps num_of_samples is less than 1.
Perhaps data_files(data_counter).Video is empty for all num_of_samples different videos.
Perhaps none of the labels on any of the videos exactly match any of the values in the variable labels
  2 个评论
Walter Roberson
Walter Roberson 2021-9-18
Right after you assign to the variable labels do
segment_list = struct('videoID', [], 'start', [], 'end', [], 'label', []);
This will initialize segment_list to an empty structure with the required fields.
Then if any of the "Perhaps" that I listed above hold true, then at least segment_list will be defined.

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