how to write variables in a functions workspace by assignin

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

[Muthu Annamalai]

Alternatively, you may want to create a static object like 'containers.Map' and store the string-value associations.

Check out http://www.mathworks.com/help/matlab/ref/containers.mapclass.html

Answer 1

[Alec]

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".

Answer 2

[Alexandre Laurin]

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.

Answer 3

[Jan]

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

Answer 4

[Azzi Abdelmalek]

dummy=20
k=3;
assignin('base',sprintf('h_ann%d',k),dummy)

[Muge Erinc]

Thanks for your answer. however i intentionally do not want to use the base, i want to write it into the functions local workspace.