Question

%%我想将char（此处为var_name {1}）的值传递为直方图函数中double（此处为x）的值。我怎样才能做到这一点？

 % var_name could be much bigger
 h={'h1','h2'}
 var_name ={'x','y'}
 time_step=100;
 for i =1:time_step
   x=%code that extract x from some data file %
   y= %get y from some other file (actually using find command)
  %the time loop will overwrite the x and  y  values 
 ` for k=1:length(var_name)
    %figure  h 

    h{k}=histogram(var_name{k}) % I have been suggested to avoid eval  % 

    %lot of procees to do here for every variable  say  x y than save  the          
     %saveas(h{k},sprintf(...))
   end 

  end

Answer 1

您必须使用eval来评估变量名称，为您提供变量包含的数据向量：

histogram(eval(var_name{1}));

但是，我猜你有更好的方法可以解决你的问题，因为using dynamically named variables is general not good practice。

根据您更新的示例，您可以使用structures和dynamic field names的一种非eval方式：

for i = 1:time_step
  data.(var_name{1}) = % code that extract xs from some data file
  data.(var_name{2}) = % get y from some other file (actually using find command)
  for k = 1:length(var_name)
    h{k} = histogram(data.(var_name{k}));
    ...
  end
  ...
end

如何在任何matlab函数中将char值作为double值传递我提供了与char同名的双变量（请参阅详细信息）？

1 个答案: