how can I declare a persistent variable as single precision?

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

Answer 1

[Walter Roberson]

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);

[LiAS]

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]

persistent MyPersistentVariable ;
if isempty(MyPersistentVariable )
  MyPersistentVariable = single(0.0);
end