Error in s2rlgc

I think there is a bug in the s2rlgc code currently being distributed (or at least in 2018a). When you feed the function S parameters swept over frequency, the following error results:

Error in s2rlgc (line 129)
    if any(isnan(R) || isnan(L) || isnan(G) || isnan(C))

I believe the intended effect of this line is properly obtained by changing it to:

    if any(isnan(R)) || any(isnan(L)) || any(isnan(G)) || any(isnan(C))

since the || operator doesn't appear to work between arrays, nor automatically reduce the array of zeros to a single 0. By doing the any() first, then the || operator, the arrays are properly collapsed prior to the boolean operation.

Answer 1

[Debraj Bhattacharjee]

This is a bug in MATLAB R2019a when more than one set of s-parameters is used.

However, to work around this issue please follow the steps given below:

1. Create a function named "s2rlgc_modified.m", in which the line corrsponding to:

 if any(isnan(R) || isnan(L) || isnan(G) || isnan(C))

is replaced with:

 if any(isnan(R) | isnan(L) | isnan(G) | isnan(C)) 

The rest of the function is identical to "s2rlgc".

2. Please call the "s2rlgc_modified" function instead of the "s2rlgc" function.