Assign an incrementing variable to another variable name

Question

Gulce Lale 2020-11-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/635880-assign-an-incrementing-variable-to-another-variable-name

评论： Peter Perkins 2020-11-18

This code can compile when the name_1 and other variables are given manually like I commented below: %name_1 = 'SID12_MVI0248_Trim.mp4'; etc.

However, what I am trying to do is this: I want the code to get this variables from excel sheet and assign the cell data to the variables. For example, it reads from the excel sheet 'face_info' and assume I have 10 videos in the excel sheet. I want every video's name should be updated as: name_1 = first name in the excel sheet and, name_2 = second name etc. and for each name(or video) I want it to compile the function B below which edits the videos in other scripts. So, I want to deal with each of the videos, but I always get the error Error using eval "Unrecognized function or variable 'name_1'." and "invalid use of 'name_' on the left side of an assignment".

I would really appreciate if someone could help me, thanks in advance!

video_name=[]; %name of the video
face_length =[]; %face length
nose_x = [];
nose_y = [];
non_blink_time = [];
[num1,txt1,data1] = xlsread('face_info.xlsx');
for j=1:length(txt1)
    video_name = data1(:,1);
    nose_x = data1(:,3);%x coordinate of the nose
    nose_y = data1(:,4);%y coordinate of the nose
    face_length = data1(:,5);%y length of the face
    non_blink_time = data1(:,6); %non-blink start time
end
%disp(video_name{2}); 
videosPathToBeEdited = '/Users/user/Desktop/VideoCodes/';
editedVideosFolderPath = '/Users/user/Desktop/VideoCodes/';
videos = dir(videosPathToBeEdited);
cd(fullfile(editedVideosFolderPath));
faceCell = cell(video_number);
for i = 1:video_number
    vidName = video_name{i+1}
    disp(vidName);
    vidPath = strcat(videosPathToBeEdited, vidName);
    disp(vidPath);
    V= VideoReader(vidPath);
    RGB= readFrame(V);
    imshow(RGB);
    ['name_' num2str(i)] = video_name{i+1};
    non_blink_time  = ['starting_second_' num2str(i)];
    nose_x  = ['nose_x_coord_' num2str(i)];
    nose_y = ['nose_y_coord_' num2str(i)];
    face_length = ['face_length_' num2str(i)];
    disp(video_name{i+1});
%name_1 = 'SID12_MVI0248_Trim.mp4'; starting_second_1 = 1;    nose_x_coord_1 = 954;  nose_y_coord_1 = 520;    face_length_1= 397; gender_1 = 'male';
B= conditionprep_behav(eval(['name_' num2str(i)]),sampling_rate_in_use,eval(['starting_second_' num2str(i)]),video_duration,eval(['nose_x_coord_' num2str(i)]),eval(['nose_y_coord_' num2str(i)]),eval(['face_length_' num2str(i)]),video_number,lum_mean,lum_std,resX,resY,elliptic_mask_threshold,video_duration_inname);
faceCell{i}.info = B;
faceCell{i}.sex = eval(['gender_' num2str(i)]);
end
save (['faceCell' video_duration_inname '.mat'],'faceCell');

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Gulce Lale 2020-11-4

Thank you very much, you really solved the problem!:)

Peter Perkins 2020-11-18

在 MATLAB Online 中打开

Gulce, you will likely also be better off using readtable instead of xlsread.

Also, this loop seems suspect, because nothing in the body appears to change over the iterations:

for j=1:length(txt1)
    video_name = data1(:,1);
    nose_x = data1(:,3);%x coordinate of the nose
    nose_y = data1(:,4);%y coordinate of the nose
    face_length = data1(:,5);%y length of the face
    non_blink_time = data1(:,6); %non-blink start time
end

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Assign an incrementing variable to another variable name

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Assign an incrementing variable to another variable name

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