found unsupported dynamic matrix type at output port 0

Hi, I am working on Laplace transfer function i.e y=sum(sin(t_rad).*exp(-s*t_rad).*0.1); where i need to convert the function into HDL code.

Error i am getting is " found unsupported dynamic matrix type at output port 0" & output y is 1*N matrix. What is the solution to avoid this error?.

Answer 1

[Tim McBrayer]

HDL Coder does not support dynamic matrices at any point. The matrix in question may not be your final output, but some intermediate temporary value inside your complicated expression.

I would try converting your code to a much simpler form with explicitly typed and sized variables for each operation. This may expose or even eliminate the dynamic matrix.

You can convert:

 y=sum(sin(t_rad).*exp(-s*t_rad).*0.1)

to this style:

 t1 = -s * t_rad;
 t2 = exp(t1);
 t3 = t2 .* 0.1;

and so on. If you are in the fixed point domain already, you can apply explicit types and sizing at each step.

[Walter Roberson]

With the output y being 1 x N, and with it being a sum(), the implication is that your input variables are two dimensional. If either of the dimensions of your input variables are dynamic, then it would need dynamically-sized temporary arrays for the intermediate calculations, and that is not supported.

[Amruta Radder]

Thank you for the suggestions.

I understood the problem statement now after making changes in the program i am getting new error i.e Found unsupported division expression for HDL code generation; Signed input data type is not supported for division with Floor RoundMode.

Fixed point conversion and select code generation target flow is done, near HDL Generation error is occurring.

Suggest how to clear above mentioned error for further process.

[Walter Roberson]

Use Fixed Point Designer and configure the rounding mode to "Simplest"; see http://www.mathworks.com/help/dsp/ug/concepts-and-terminology.html

[Amruta Radder]

Yes, I have tried all options for rounding mode by selecting floor and zeros but still i am struck with same error i.e. Found unsupported division expression for HDL code generation; Signed input data type is not supported for division with Floor RoundMode. For expression a2=cos(imag(a1))+1j.*sin(imag(a1)); i am getting the above error. According to my knowledge i feel that i have to use cordicsin and cordiccos function instead of cos and sin because output is in complex form. Is it the right way of using? if so suggest me how to use cordicsin function.