为matlab保存功能编写包装器

Question

我会为 matlab 的 save 函数编写一个带有预定义选项的包装器（在我的情况下预定义 version 以允许保存大文件），即类似这样的东西

save('parameters.mat', 'some', 'parameters', 'here', '-v.3');

应该变成这个

save_large('parameters.mat', 'some', 'parameters', 'here');

其中save_large 是save 的包装器，version 设置为'-v7.3'：

function [  ] = save_large( filename, varargin )
%varargin to allow for multiple variable storing?

%what to write here to save all variables (declared as chars) stored in
%the workspace where 'save_large' was called with version set to '-v7.3'?

end

Answer 1

因为变量不会存在于函数save_large 的范围内，所以您必须使用evalin 从"caller" 工作区获取变量。

使用try，我们还可以确保变量存在在调用者工作区中。

要在 .mat 文件中获取正确的变量名称，我们可以使用（不鼓励的）eval 函数，或者下面将所有变量分配给结构的方法，然后使用 -struct标记save。

function save_large(filename, varargin)
    % Set up struct for saving
    savestruct = struct();
    for n = 1:numel(varargin)
        % Test if variable exists in caller workspace
        % Do this by trying to assign to struct
        % Use parentheses for creating field equal to string from varargin 
        try savestruct.(varargin{n}) = evalin('caller', varargin{n});
            % Successful assignment to struct, no action needed
        catch
            warning(['Could not find variable: ', varargin{n}]);
        end
    end
    save(filename, '-struct', 'savestruct', '-v7.3');
end

---

例子

% Create dummy variables and save them
a = magic(3);
b = 'abc';
save_large test.mat a b; 
% Clear workspace to get rid of a and b
clear a b
exist a var % false
exist b var % false
% Load from file
load test.mat
% a and b in workspace
exist a var % true
exist b var % true