Maxflat function generates error message for certain condition.

In the following situation, the maxflat function has error. Does any one have same problem? How can I fix that? Thank you.

>> [b,a] = maxflat(9,3,0.5,'trace'); Table:

    L         M         N         wo_min/pi wo_max/pi

    9.0000         0    3.0000         0    0.2707
    8.0000    1.0000    3.0000    0.2707    0.3710
    7.0000    2.0000    3.0000    0.3710    0.4581
    6.0000    3.0000    3.0000    0.4581    0.5419
    5.0000    4.0000    3.0000    0.5419    0.6290
    4.0000    5.0000    3.0000    0.6290    0.7293
    3.0000    6.0000    3.0000    0.7293    1.0000

Error using cplxpair (line 67) Complex numbers can't be paired.

Error in zp2sos>orderzp (line 206) p = cplxpair(p);

Error in zp2sos (line 85) [z,p,lz,lp,L] = orderzp(z,p);

Error in maxflat>buildsos (line 506) [sosden,gden] = zp2sos(zeros(size(ar)),ar,1); %#ok

Error in maxflat (line 213) [sos,g] = buildsos(br,L,ar,a,b2);

Answer 1

[Sindhu Yerragunta]

Hi Keonwook,

Please refer diagnostics section for why this error occurs:

https://in.mathworks.com/help/matlab/ref/cplxpair.html

Hope this helps you.

-Sindhu

[Keonwook Kim]

Thank you for the reply. The 'maxflat' is the genuine matlab toolbox function. I did not make it. I think that the Mathworks should aware this problem.

Answer 2

[Jan]

I confirm that Matlab 2016b stops with this error. For other parameters the function works as expected, e.g.:

[b,a] = maxflat(10, 3, 0.5, 'trace')

If you think that MathWorks should be aware of the problem , please contact them using the "Contact us" button.