Why do I receive an error when using the LIMIT function to determine the limit of a vector of symbolic equations within the Symbolic Math Toolbox?

For example, when I execute the following command:

syms s

v = [1/s; s; 1/s];

L = limit(v, 0);

I receive the following error message:

 ??? Insufficient outputs from right hand side to satisfy comma separated

 list expansion on left hand side.  Missing [] are the most likely cause.

Answer 1

[MathWorks Support Team]

This bug has been fixed for Release 14 (R14). For previous releases, please read below for any possible workarounds:

This has been verified as a bug in the LIMIT function within the Symbolic Math Toolbox in the way it handles vectors of undefined limits.

Currently, to work around this issue, you can make a slight modification to the sym/limit.m file by performing the following steps.

1) Open sym/limit.m by typing

edit sym/limit

in the MATLAB Command Window.

2) Save this file as "limit.m.old".

3) Change the last line of the function from:

if ~isempty(k), r(k).s = 'NaN'; end

to:

if ~isempty(k), [r(k).s] = deal('NaN'); end

4) Save this file as "limit.m".