Creating a function to Import data into structures
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Hello,
I am currently using an sdk to import data from a software we use in our lab. When I import the data, I bring it into matlab in structures arrays which have fields for each trial I import, and sub-fields for each marker. So the structure looks like this...
TrajX.trialname.marker_name (TrajX stands for trajectory in the x direction)
I wanted to write a function to import this data so as to down on the lines of code in the script. However I am running into an issue. When I define the output of my function to NOT include the trial name...
[TrajX] = Import_Data_Function(vicon,subject,trialname,firstframe,lastframe);
the data is imported just fine, but the first trial's data gets overwritten when I attempted to import the next trial's data. So I end up with only one field consisting of a single trial name
If I include the trial name in the output of my function...
[TrajX.(trialname)] = Import_Data_Function(vicon,subject,trialname,firstframe,lastframe);
the data is imported with a field for each trial name, but instead of a structure that consists of TrajX.trialname.marker_name, I get a structure that consists of TrajX.trialname.trialname.marker_name. Basically, there is a field for each trial name followed by another sub-field of the same trial name, then another sub-field for each marker name.
I'm not sure why this second method creates two fields/sub-fields for trial names when I only want one???
Any help on this would be greatly appreciated. I've attached the original script, function, and new script with function.
Thanks in advance.
2 个评论
Mathieu NOE
2023-3-15
hi
what is the way you want to have one or multiple files get organized in a data structure ?
Josh Tome
2023-3-16
采纳的回答
[TrajX.(trialname),TrajY.(trialname),TrajZ.(trialname)] = Import_Data_Function(vicon,subject,firstframe,lastframe);
function [X,Y,Z] = Import_Data_Function(vicon,subject,firstframe,lastframe) % removed TRIALNAME
%% IMPORT MARKER TRAJECTORIES FROM NEXUS
% Get marker trajectory names
marker_names = vicon.GetMarkerNames(subject);
% Get marker trajectory data
% (imports data into structure arrays for TrajX,TrajY,and TrajZ. These structures have fields for each marker, and a horizontal array within that field)
X = struct();
Y = struct();
Z = struct();
for i = 1:length(marker_names)
[Xv, Yv, Zv, ~] = vicon.GetTrajectory(subject, marker_names{i});
% trims the trajectory data if a region of interest was selected
X.(marker_names{i}) = Xv(firstframe:lastframe);
Y.(marker_names{i}) = Yv(firstframe:lastframe);
Z.(marker_names{i}) = Zv(firstframe:lastframe);
end
end %End of the function
3 个评论
Josh Tome
2023-3-16
"I tried this, but unfortunately I got the following error..."
No, the error message clearly show code that does not appear in my answer.
I specifically removed TRIALNAME from the function, because it does not work. Yet the error message you showed in your comment, indicates that you are still using TRIALNAME inside the function.
I am happy to help you further with any questions or issues you have with the code from my answer.
Josh Tome
2023-3-17
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