Why does this error happen?

load NewTemplates 
snap=imread('image1.png');
snap=imresize(snap,[42 24]); 
rec=[ ];

for n=1:length(NewTemplates)
    cor=corr2(NewTemplates{1,n},snap); 
    rec=[rec cor]; 
end

error-> ??? Cell contents reference from a non-cell array
object.

Error in ==> Letter_detection at 9
    cor=corr2(NewTemplates{1,n},snap);

Answer 1

[Guillaume]

Your code expects that NewTemplates is a cell array (or an object that supports {} indexing). It isn't. Presumably, NewTemplates is popped into existence by your load NewTemplates, so you need to investigate that file to see what it contains.

What is

class(newTemplates)