Warning: Unable to interpret LaTeX string

k=sym('piecewise([n = -1, log(x)], [n <> -1, x^(n + 1)/(n + 1)])');

text('Interpreter','latex',...
'String',['$$',latex(k),'$$'],...
'Position',[.1 .5],...
'FontSize',20)

what's wrong with my code？ is my matlab version too old？

[Walter Roberson]

You did not happen to mention which MATLAB version you are using.