Error in UIgetfile

Hi,

How to load multiple mat files into the workspace , I tried this but working only for single mat file.

[FileName,PathName] = uigetfile('*.mat','Select mat file','MultiSelect','on');

NAME = [PathName,FileName];

evalin('base',['load ' NAME]);

Answer 1

[Walter Roberson]

uigetfile() returns a cell array of strings when MultiSelect is on.

It is not possible to request to load multiple files in a single load() statement. You will have to loop.

Loading a mat file into a workspace the way you are doing is not recommended, as the files might happen to contain variable names that interfere with something else you are doing.

[Karthik KJ]

do you say to load it as guidata?

[Walter Roberson]

Use the function form of load() to return a structure that contains all the loaded variables as fields. If you must write the results into the base workspace for some reason, then write the entire structure as a unit.

Assume that the user is going to be malicious and deliberately ask to load a .mat file that has a variable name the same name as some important existing variable.

Answer 2

[Jan]

[FileName, PathName] = uigetfile('*.mat','Select mat file','MultiSelect','on');
if ~isequal(FileName, 0)
  FileName = cellstr(FileName);  % Care for a single selection
  for iFile = 1:numel(FileName)
    evalin('base', ['load ',  fullfile(PathName, FileName{iFile}]);
  end
end

I do not like evalin, because it impedes debugging and poofing variables to another workspace slows down Matlab. The JIT acceleration cannot recognize the existence or type of a variable when they are injected from a subfunction using evalin. It would be better to forward the loaded data structs as outputs.