setappdata of multiple variables loaded from *.mat

Hello,

On my GUI I'm loading a *.mat file containing 15 variables that should be saved to appdata.

How can I

setappdata(0,'x',x);

for all variables at once with variable name and avoid to set 15 variables one at the time?

Do I have to necessarily load(*.mat) into workspace or is there a direct way to setappdata after uigetfile?

Regards

[Niels]

if u are interested in creating gui's

here is a video in which Doug Hull is also talking about setappdata

Answer 1

[Walter Roberson]

data_struct = load('NameOfMatFile.mat');
fn = fieldnames(data_struct);
for K = 1 : length(fn)
  this_field = fn{K};
  setappdata(0, this_field, data_struct.(this_field));
end

Answer 2

[Niels]

Hi jan,

if you are working at a gui it would be better to save the appdata inside the figure, so that the variables are automatically deleted whenever you close the figure and you dont have to remove them manually.(usually there are no problems, but it depends on where u saved your Callback Functions -> just try it)

if u work with GUIDE (and you didnt change the tag of the figure) it is

setappdata(handles.figure1,'Name',Value)

if you do not work with gui, but used guihandles its still the tag of your figure.

setappdata(handles.TagOfYourFigure,'Name',Value)

You can save the 15 Variables in one cell array or structur and save the cell/ strucur

structur would be easier to handle :D

like

Data.VarName1=VarName1
Data.Varname2=VarName2
...

setappdata(handles.figure1,'DataSavings',Data)

get them back with

Data=setappdata(handles.figure1,'DataSavings')

concerning the issue to put the 15 Variables into 1 Variable, there is a way, but i think it might not work for u:

with

list=who

you get all variablNames from the Variables which are saved at your workspace and with

for i=1:numel(list)
    Data{i}=evalin('base',list{i})
end

you save their Values (without Names) in Data. But it would be hard to get the right Variable back if you dont know in which order you declared the Variables. And if you declared more than these 15 Variables, you got a Problem.

but maybe u might think of some modifications that help u

Greeting Niels

[Jan w]

Thanks Niels!

Answer 3

[Jan]

You can store the variables in struct:

Data = load(FileName);

Then storing the variables with one setappdata together with their names is trivial.