problem to print size of graphic

[shivax]

hi,

look that:

 AnNumBackDatt=AnnualNumBackDatt; %a che idx scrivere l'anno
 AnBackDatt=AnnualBackDatt;   (2014 2015 2016 2017)


plot(x,DrawU,'r', x,DrawF,'b');
set (gca, 'XTick',AnNumBackDatt, 'xticklabel',AnBackDatt);

if  AnBackDatt is array of number..it is ok

if i try to use cell string 

AnBackDatt=num2cell(AnnualBackDatt)

i receive this error:

ऀwarning: range error for conversion to character value



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