MATLAB: Error using – Matrix dimensions must agree. Error in mmmmmmmtest1m (line 326) a2=aa-a1;

Question

Error using  - 
Matrix dimensions must agree.
Error in mmmmmmmtest1m1m (line 326)
a2=aa-a1;

i am surprised why my a2 not calculating my aa value is ok and a1 but the aa and a1 matrices are not equal when i minus them it gave above error ,i spend 10 days on it but this issue is not solving

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 Code Hints:-
u(hour)=hour; 
Clothesdrye(hour)=power_pattern(hour,1);
a1=find(Clothesdrye);

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stereo=[1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1];
Fan=[0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 1 0 0 0 1 1];
aa=find(stereo);
bb=find(Fan);

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Index

a2=aa-a1;
b2=bb-b1;
% len = min([numel(aa) numel(a1)]);-----1
% a1 = aa(1:len) - a1(1:len);-----2
%a1=linspace(0,14,14);%# 14 values spanning the range 0 to 14------3
%a1=[1     8     9    10    11    12    13    14    15    16    17    22    23    24];----4

i have also tried from 1 to 4 but in vain

i am pasting the bit pattern of variables may be helpful for commenters/guiders below.

Error using  - 
Matrix dimensions must agree.
Error in WDO_SG_Code_PL_test1m (line 326)
a2=aa-a1;
>> u
u =
       1     2     3     4     5     6     7     8     9    10    11    12    13    14    15    16    17    18    19    20    21    22    23    24
>> power_pattern
power_pattern =
       0     0     0     0     0     0     0     1     1     1     1     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     0     0     0     0     0
       0     0     0     0     0     0     0     1     1     1     1     0
>> Clothesdrye
Clothesdrye =
       0     1     1     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
>> a1
a1 =
       2     3     4
>> aa
aa =
       1     8     9    10    11    12    13    14    15    16    17    22    23    24
>> a1
a1 =
       2     3     4
>> a2
Undefined function or variable 'a2'.
>> Dish_washe
Dish_washe =
       0     1     1     1     1     1     1     1     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0
>> b2
Undefined function or variable 'b2'.
>> bb
bb =
       9    10    11    12    13    14    15    16    17    19    23    24
>> b1
b1 =
       2     3     4     5     6     7     8    10

Answer 1

Your aa has is a 14 element row vector. Your a1 is a 3 element row vector. What result are you expecting when you subtract them?

Hint: bsxfun()