保存.mat文件时，是否使用-v7.3开关？

Question

保存.mat文件时，是否使用-v7.3开关？

4

我正在运行一个m文件，创建两个变量，Clus和Watts_Map。我想将这两个变量保存到以“.mat”结尾的文件中。这两个变量的维度为（1152,241,319），其中1152表示在0.3125度增量下的360度经度，241表示从南纬30度到北纬30度的0.25度增量的纬度，共319个时间步长。代码一直运行到最后，但出现以下错误：

[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，因此认为这是最新的版本。此外，我已经在较小的空间域上运行了完全相同的代码（但在2920个时间步骤内），没有出现错误。

%  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

- Kevin_Q

1个回答

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- chappjc · Accepted Answer

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');

您也可以在“常规偏好设置”中设置默认值：

enter image description here

请注意v7.3在R2008a版本之后可以压缩数据:

压缩-v7.3 MAT-Files

使用save函数的-v7.3选项，您可以将大小超过2 GB的数据项存储在MAT-file中。该选项在MATLAB R2006b中引入。从MATLAB R2008a开始，save现在会压缩这些MAT-files。

我曾看到v7.3文件的文件大小增长，但那已成为历史，也许现在情况更好了。