Fast method to store workspace variables into another worspace variable?

1 次查看（过去 30 天）
Darin McCoy
Darin McCoy 2011-11-16
Hi- i would like a fast method to store all workspace variables into another workspace variable.
My current slow method is this...
tmp=tempname;
save(tmp)
x = load(tmp);
delete(tmp)
any better ideas?
  1 个评论
Walter Roberson
Walter Roberson 2011-11-16
I think you will find that that method does not work when it comes to objects, and I think you will find it doubles the memory instead of sharing it (until the next write to the variables anyhow.)

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Sean de Wolski
Sean de Wolski 2011-11-16
You could pass them into the function the typical way
function y = some_fun(tmp,x)
y = x*tmp;
Or you can use setappdata/getappdata, though this can be dangerous. It is very fast though. To do it, I recommend packing everything into a struct or a cell and saving it as some obscure name. I have had to do this for big variables passed between functions that are called (literally) billions of times.
S.tmp = tmp;
S.x = x;
setappdata(0,'S_2be_used_in_foobar',S);
%in foobar
function y = foobar()
S = getappdata(0,'S_2be_used_in_foobar'); %pull in
tmp = S.tmp; %extract
x = S.x
y = tmp*x;
Just note this can be very dangerous and is generally recommended against. To safeguard it, use a long name with lots of underscores and numbers.
  3 个评论
显示 1更早的评论
Sean de Wolski
Sean de Wolski 2011-11-21
If you're still wondering. Storing data to the root directory is dangerous since that's where MATLAB stores some important things that if overwritten or reset could cause fatal/difficult to trace errors.
Sean de Wolski
Sean de Wolski 2011-11-21
And yes, you could do a loop, I would recommend using the loop to pack everything into a struct using the fieldnames option.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Common Operations 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by