Is it clear, why "DiaryName.log" must fail? The code means, that the field "log" of the struct "DiaryName" is wanted, but DiaryName is a string.
What is the problem with this commands:
DiaryName = strcat('Paper_', datestr(now,'yyyy_mm-dd_HH:MM:SS'), '.log');
diary(DiaryName)
Under Windows the ':' is not allowed in path names.
Instead of a macro let "DiaryPath" be a function, which replies the wanted folder:
function P = DiaryPath
P = 'C:\YourFolder\';
You have tried
diary(DiaryName)
and
diary('DiaryName')
This is pure guessing. Better read the Getting Started chapters of the documentation an rely on educated guessing only.
