保存.mat文件，使用-v7.3开关？

Question

我正在运行一个m文件，创建两个变量Clus和Watts_Map。我想将两个变量保存到以＆＃34; .mat＆＃34;结尾的文件中。两个变量的尺寸为（1152,241,319），其中1152为360度经度，增量为0.3125度，241为纬度，30S-30N为0.25度增量，超过319个时间步长。代码一直工作到最后，我得到错误：

[Warning: Variable 'Clus' cannot be saved to a MAT-file whose version is older
than 7.3.
To save this variable, use the -v7.3 switch.
Skipping...] 
[Warning: Variable 'Watts_Map' cannot be saved to a MAT-file whose version is
older than 7.3.
To save this variable, use the -v7.3 switch.
Skipping...] 

我正在使用Matlab版本R2014a，所以会认为这是最新版本。此外，我在较小的空间域（但超过2920个时间步长）上运行相同的精确代码而没有错误。

%  Clear all variables, initialize counter, indexed by timestep
clc;
clear all;

rain = NaN(1152,241,319);
Clus = NaN(1152,241,319);
Areas_Final = NaN(500,319); 
Wattage_Final = NaN(500,319);
Cluster_size = zeros(319,1);
Watts_Map = zeros(1152,241,319);

for year = 2000%:2008;
    Nyear = sprintf('%04d',year);

    %  Call on the files for each year
    filename = (['pr_3hr_GFDL-HIRAM-C360_amip_r1i1p1_' num2str(Nyear) '010100-' num2str(Nyear) '123123_subset_TROPICS.nc']);
    disp(filename)
    disp(year)

    rain_rate = ncread(filename,'pr');

    %  Call on each timestep
    for i = 960:4:2236; % Approx May 1st-Sep 30th

        %  Set extract subset for region, mask land areas, for each
        %  timestep

        disp(i)
        rain = rain_rate(:,:,i);

        % Eliminate bad/no data points
        index_rain = (rain >= (5.4e-05)) & (rain < 1e-2); % 0.2mm/hr is min rain rate

        % Cluster each morning and afternoon matrix
        Clus(:,:,i) = cluster_it(index_rain);

        % Calculate cluster areas
        Areas = cluster_areas_TROPICS(Clus(:,:,i));
        Areas_Final(1:length(Areas),i) = Areas;

        % Calculate cluster wattages
        Wattage = cluster_wattage(Clus(:,:,i),rain);

        Cluster_size(i,1) = max(max(Clus(:,:,i)));

        % Create dummy matricies to populate and use to create the wattage
        % maps
        D = zeros(1152,241);
        E = squeeze(Clus(:,:,i));
        for index = 1:Cluster_size(i);
            D(E == index) = Wattage(index);
        end

        Watts_Map(:,:,i) = D;

        % Clear the dummy matricies
        clear D E

    end

    % Save the output as a .mat file
    file_out = sprintf(num2str(Nyear), year);
    matfile = [file_out '_TROPICS_Watts_Maps_inc_Land_low_rain_threshold.mat'];
    save(matfile, 'Clus', 'Watts_Map');

    % Clear unneeded variables to save memory and prevent overwriting
    clear index_rain rain Areas Wattage Clus file_out filename Areas_Final rain_rate Watts_Map Cluster_size year matfile

end

Answer 1

即使在当前版本中，默认格式也不是v7.3。您必须指定它：

save(matfile, '-v7.3', 'var1', 'var2');

您还可以在＆＃34;常规首选项＆＃34;：

中设置默认值

请注意v7.3 does compress data as of R2008a：

  

压缩-v7.3 MAT文件

  您可以使用保存功能的-v7.3选项在MAT文件中存储大小超过2千兆字节的数据项。该选项在MATLAB R2006b中引入。使用MATLAB R2008a，立即保存压缩这些MAT文件。

我看到v7.3文件的文件大小爆炸，但这是历史，现在可能更好。