why do i get this untitled error ?

this is the function code

function dd=day_diff(month1, day1, month2, day2)

if((month1 >12) ||( month2>12) || (day1 >31) ||(day2>31)||(month1==2&&day1>28))
   error('1');
end 

m=[31 28 31 30 31 30 31 31 30 31 30 31];
if (month1>1)
    d1=sum(m(1:month1-1))+day1;
else d1=day1;
end 
if (month2>1)
d2=sum(m(1:month2-1))+day2;
else d2=day2;
end

dd=abs(d1-d2);

when i run the code and fail in the conditon (month1==2&&day1>28)

i get this response

>> day_diff(2,29,1,30)
Error using day_diff (line 4)
1

the Matlab show the error message but give me untitled error !

[Thorsten]

Note that you do not generate an error if if the months has only 30 days, but you set day to 31.

Answer 1

[Star Strider]

You are creating that in your function! Calling error displays the error message and stops execution. See the documentation (link) for details.