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how to write variables in a functions workspace by assignin

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Muge Erinc
Muge Erinc on 4 Feb 2013
Answered: Jan on 11 Jan 2014
Hello,
I would like to create annotation objects in a functions local workspace, where object names are created in a loop.
here is how I would like to code to look:
x_ini = 0.27;
for k=1:6
dummy = annotation(f,'textbox','EdgeColor', 'white', ...
'String',mycell(:,k),'Position',[x_ini 0.34 0.11 0.15],...
'BackgroundColor','white','Visible','on');
x_ini = x_ini+ 0.08;
assignin('??ws??',['h_ann_' num2str(k)], dummy)
end
When I use eval, this error pops: attempt to write a variable to a static workspace.
With evalin or assingin, I cannot find how to name the functions local workspace. opening up the loop works, however it is ugly: h_ann1 = ... h_ann2 = ...
Thanks in advance, Muge
  1 Comment
Muthu Annamalai
Muthu Annamalai on 23 Feb 2013
Alternatively, you may want to create a static object like 'containers.Map' and store the string-value associations.

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Accepted Answer

Alec
Alec on 11 Jan 2014
To use `assignin` inside a function try:
feval(@()assignin('caller',['h_ann_' num2str(k)], dummy));
This temporarily creates an anonymous function around `assignin` and then calls it. Effectively making your function the "caller".

More Answers (3)

Alexandre Laurin
Alexandre Laurin on 23 Feb 2013
Edited: Alexandre Laurin on 23 Feb 2013
assignin('caller',['h_ann_' num2str(k)], dummy)
will work unless you are calling this function from another function (or script), in which case the problem is a little deeper.
Also, you might want to have a look at structures with dynamic field names, I'm pretty sure they'll do what you want to do with more elegance.

Jan
Jan on 11 Jan 2014
Hiding an index in the name of a variable is a bad idea. It is complicated, as you see already, and requires equivalently complicated method to access these variables later on.
Better use an index as index:
h_ann = cell(1, 6);
for k=1:6
...
h_ann{k} = dummy;
end

Azzi Abdelmalek
Azzi Abdelmalek on 4 Feb 2013
Edited: Azzi Abdelmalek on 4 Feb 2013
dummy=20
k=3;
assignin('base',sprintf('h_ann%d',k),dummy)
  1 Comment
Muge Erinc
Muge Erinc on 4 Feb 2013
Thanks for your answer. however i intentionally do not want to use the base, i want to write it into the functions local workspace.

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