How to apply filters for multiple variables?

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

[dpb]

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

Answer 1

[Jan]

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);

[Newbie]

Thanks Jan. Will try this