Error in running "load topo" in MATLAB 2015a

Hi everyone,

My code, designed in MATLAB 2013a, contains:

    load topo

which works fine but I get the following error when I run it in MATLAB 2015a:

Error using load

Unable to read file 'topo'. No such file or directory.

Error in anim_groundtrk (line 63)

How can I resolve this? Thank you for your help.

[Walter Roberson]

What happens if you ask

which topo.mat

?

You would expect to see it in the directory computed by

fullfile(matlabroot, 'toolbox/matlab/demos/topo.mat')