Creating a persistent variable type single

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Terry Sherman
Terry Sherman 2011-4-25
Suppose I want to create a persistent variable but I wanted that variable's data type to be a single. By default MATLAB creates doubles. How can I have them be singles?
(As a background I am using Simulink to model a plant and its controller. I am using Embedded MATLAB as the code for the controller. I want the data types to mimic the data types in the final DSP I'll use in my product. So I want the Embedded MATLAB to run using the single rather than double)
I have tried the following but it does not work:
persistent Accumulated_I_Error;
if isempty(Prev_Line_Voltage_ADC)
Accumulated_I_Error = single(0);
end
...
Accumulated_I_Error = a + b;
...
I receive a compile error of: Class mismatch (single ~= double). The class to the left is the class of the left-hand side of the assignment.

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回答（1 个）

Sean de Wolski
Sean de Wolski 2011-4-25
What classes are a & b?
Does the error occur on that line?
  1 个评论
Terry Sherman
Terry Sherman 2011-4-25
The error occurs on the line Accumulated_I_Error = single(0); I was hoping that the data types of 'a & b' are irrelevant if I declared the type of Accumulated_I_Error. I am in the process of casting a & b to see if that matters.

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