MATLAB: Save location not working

errorsave

Morning, I have a problem with not being able to solve the problem with "Error using save: Must be a string scalar or character vector". The save directories are being created but the save function is refusing to save to these, I think it has something to do with the dates within the subfolder directories but I do not know how to save it alteratively. Could someone have a look please?
sv_direct ={'D:\One drive\OneDrive - XUniversity\PhD\TecPlot\MATLAB_sim_var\'};
coupled_data_export = num2cell(rand(3));
save_var{i} = {'coupled_data_export'};
for i = 1:length(sv_direct)
    compare_locs{i} = sprintf('%s%s_subplot_figures/%s/%s/%s', sv_direct{i},string(folder_pts(5)),string(coupled_FN(1)),currDate,string(folder_pts(6)));
    % Finally, create the folder if it doesn't exist already.
    if ~exist(compare_locs{i}, 'dir')
        mkdir(compare_locs{i});
    end
end
for i = 1:length(sv_direct)
    save_locs{i} = sprintf('%sEqualised_for_TP_export/%s/%s/%s', sv_direct{i},string(coupled_FN(1)),currDate,string(folder_pts(6)));
   if ~exist(save_locs{i}, 'dir')
        mkdir(save_locs{i});
    end
end
for i = 1:length(save_var)
    save_name{i} = char(save_var{i});
    
    for k = 1 : length(save_locs)
        baseFileName = char(sprintf('%s.mat', save_name{i}));
        fullMatFileName = fullfile(save_locs{k}, baseFileName);
        save(fullMatFileName, save_var{i});
        fprintf('Saving to: %s.\n', save_locs{k});
    end
end

Best Answer

I guess this variable save_var{i} in the 4th last line of your code is returning a cell. Whereas, the function save expects a string scalar or a character vector.
Try casting save_var{i} to char. 
sv_direct ={'D:\One drive\OneDrive - XUniversity\PhD\TecPlot\MATLAB_sim_var\'};
coupled_data_export = num2cell(rand(3));
save_var{i} = {'coupled_data_export'};
for i = 1:length(sv_direct)
    compare_locs{i} = sprintf('%s%s_subplot_figures/%s/%s/%s', sv_direct{i},string(folder_pts(5)),string(coupled_FN(1)),currDate,string(folder_pts(6)));
    % Finally, create the folder if it doesn't exist already.
    if ~exist(compare_locs{i}, 'dir')
        mkdir(compare_locs{i});
    end
end
for i = 1:length(sv_direct)
    save_locs{i} = sprintf('%sEqualised_for_TP_export/%s/%s/%s', sv_direct{i},string(coupled_FN(1)),currDate,string(folder_pts(6)));
   if ~exist(save_locs{i}, 'dir')
        mkdir(save_locs{i});
    end
end
for i = 1:length(save_var)
    save_name{i} = char(save_var{i});
    
    for k = 1 : length(save_locs)
        baseFileName = char(sprintf('%s.mat', save_name{i}));
        fullMatFileName = fullfile(save_locs{k}, baseFileName);
        save(fullMatFileName, char(save_var{i}));
        fprintf('Saving to: %s.\n', save_locs{k});
    end
end
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