fi object in indexing

hi guys, i have got following code snippet: for n = 1:30 s(n+1)= x1f(n+m0f) end

Here m0f is a fi object. While trying to run this i get error message as: Function 'subsindex' is not defined for values of class 'embedded.fi'. how can i extract the numerical value of m0f and use it or is there any other way?

thanks for your time and effort, Binayak.

Answer 1

[Walter Roberson]

m0f is an fi object, but x1f is an array, right? You will need to convert the value n+m0f into a value that can be used as an index, such as via double(n+m0f)

Is there a reason you are not using

s(2:31) = x1f(double(m0f)+(1:30))

Or have I read incorrect and x1f is in fact a function that is not vectorized ? If x1f is a function, then I would not expect the problem to show up against the code line you show: I would expect it to instead show up against some code line in x1f.

[Binayak]

thanks walter.

x1f is an array containing numbers in fixed point format (created using fi). The issue is I am writing this code for fixed point dsp implementation and will convert it to C using emlmex and emlc functions. I hence don't want to use the double type which is a floating point format.

Any suggestions?

[Walter Roberson]

Convert the numbers to one of the integer data types such as uint16 or uint32. It doesn't have to be double: you just cannot index by a fixed point number.