Remove negative numbers and rows from an array

Good afternoon,

What I want to do is to find and remove all negative values in the 2 column of each matrix within the array and its corrosponding row, leaving only the postive ones. The codes with I have used are unable to achieve this as there are always problems involving the exceedance of array bounds.

Could you help please?

%% Flume find peaks

[n,m] = size(flume);
data_flume = []; % WL is the final column
 
for i = 2:m %Excludes 1st column
    
 [pks{i}, idx{i}] = findpeaks(flume(:,i));
 data_flume{i}(:,1) = flume(idx{i});
 data_flume{i}(:,2) = pks{i}(:);1; % Works to identify peaks and their locations
 if isempty(data_flume{i});
        data_flume{i} = NaN; % Column 26 will be blank as their are no peaks, this is to fill it in.  
    end
 data_flume{i}([data_flume{:,2}]<0,:)=[] % Code will not remove negative values and their rows
end

%% Alterative code to remove negative values

 for j = 1 : numel( data_flume )
    data_flume_pos = data_flume{j}(:,2) < 0 ;
    data_flume{j} = data_flume{j}(~data_flume_pos,:) ;    % Or data_flume{j}(data_flume_pos,:) = [] ;
 end

Answer 1

[Adam Danz]

@ Richard Rees, I didn't realize you had attached data. I see what the problem was: some of your matrices do not have at least 2 columns of data. These two lines below accomplish what you're aiming for and should be added after your loop. If a matrix does not have at least 2 columns it is ignored.

% Determine which matrices have at least 2 columns 
goodMatIdx = cellfun(@(x)size(x,2)>1,data_flume); 

% Remove rows with neg vals in col 1 
 data_flume(goodMatIdx) = cellfun(@(x)x(x(:,2)>=0,:),data_flume(goodMatIdx),'UniformOutput',false);