how to simulate this filter?

[mhytr]

The coefficients of this signal is controlled by a variable parameter,the coefficients are calculated according to the parameter everytime and then the output is produced using the updated coefficients.
The question is how to simulate this kind of filter,for i can not define a transfer function in simulink/matlab

 

[bpu]

why you can't define a transfer function in matlab?

data_sample_out_1 = filter(coeff,data_sample_in_1);
coeff = func(coeff, data_sample_out_1);
data_sample_out_2 = filter(coeff,data_sample_in_2);
coeff = func(coeff, data_sample_out_2);
data_sample_out_3 = filter(coeff,data_sample_in_3);
...

you can write this in cycle also.