how can I declare a persistent variable as single precision?

17 次查看（过去 30 天）
LiAS
LiAS 2016-4-11
评论： Walter Roberson 2016-4-11
Hi, I develop in matlab functions there is a simulator which is developed in simulink which calls a function in matlab. I get the parameters values from Simulink as singles I need to declare my variables in singles too , is it possible to change the default in matlab (not simulink)as singles instead of double? the big problem is that I didnt succeed to change the persistent variables to singles, thanks

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2016-4-11
For MS Windows only, there is an undocumented feature() call that can cause variables to default to single precision. It cannot, however, be applied to a single variable, and using it almost always causes nasty problems.
If you want to be sure a variable is stored as single precision in MATLAB, then make sure it is in single precision, either through computation path or by using single() on the expression, such as
MyPersistentVariable = single(SomeExpression);
  2 个评论
LiAS
LiAS 2016-4-11
编辑：Walter Roberson 2016-4-11
thanks,
the problem is with the persistent variables
can you write this more specific
I wrote:
persistent MyPersistentVariable ;
% how can I declare it as single?
if isempty(MyPersistentVariable )
MyPersistentVariable =0; % suppose here it's too late
end
Walter Roberson
Walter Roberson 2016-4-11
persistent MyPersistentVariable ;
if isempty(MyPersistentVariable )
MyPersistentVariable = single(0.0);
end

请先登录，再进行评论。

类别

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

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by