How to apply filters for multiple variables?

Question

Newbie 2021-3-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/766636-how-to-apply-filters-for-multiple-variables

评论： Newbie 2021-3-9

Hi. I want to filter some subjects with some variables and then for the filtered subjects (rearidx) I want to add another filter (injuryidx). How do I perform this? This is my current code. Thanks

%Get rearfoot and Midfoot strikers
rearidx = [];
mididx = [];
for i=2:n
    if ~ismember(i, excludeidx)
        if strcmp(metadata.footstrike{i}, 'RFS')
            rearidx(end + 1) = i;
        elseif strcmp(metadata.footstrike{i}, 'MFS')
            mididx(end+1) = i;
        end
    end
end
[j,k] = size(rearidx);
% get healthy vs injured indicies
injuryidx = [];
healthyidx = [];
for i=2:k
    if ~ismember(i, excludeidx)
        if strcmp(metadata.injury_status{i}, 'injured')
            injuryidx(end + 1) = i;
        elseif strcmp(metadata.injury_status{i}, 'healthy')
            healthyidx(end+1) = i;
        end
    end
end

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dpb 2021-3-8

Use findgroups and splitapply if array data; otherwise put into table and see varfun

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Answer 1

Jan 2021-3-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/766636-how-to-apply-filters-for-multiple-variables#answer_642666

编辑：Jan 2021-3-9

在 MATLAB Online 中打开

In the 2nd loop, i is running over the number of elements of rearindex. Comparing it with the excludeidx is not matching anymore.

%Get rearfoot and Midfoot strikers
includeidx = setdiff(2:n, excludeidx);
isrear     = strcmp(metadata.footstrike(includeidx), 'RFS');
readidx    = includeidx(isrear);
ismid      = strcmp(metadata.footstrike(includeidx), 'MFS');
mididx     = includeidx(ismid);
% Healthy modfoot strikers:
ishealthy      = strcmp(metadata.injury_status(readidx), 'healthy');
rearhealthyidx = readidx(ishealthy);