Error using - Matrix dimensions must agree. Error in WDO_SG_Code_PL_test1m (line 322) a2=aa-a1; i got the error my code segment is below can any one help me why this error came?

sorry i can not paste the whole code this is a segment of code _______________________________________________________________

u(hour)=hour;

Clothesdryer(hour)=power_pattern(hour,1);

a1=find(Clothesdryer);

Dish_washer(hour)=power_pattern(hour,2);

b1=find(Dish_washer);

Washing_Machine(hour)=power_pattern(hour,3);

c1=find(Washing_Machine);

oven(hour)=power_pattern(hour,4);

d1=find(oven);

iron(hour)=power_pattern(hour,5);

e1=find(iron);

Refrigerator(hour)=power_pattern(hour,6);

f1=find(Refrigerator);

Lightening(hour)=power_pattern(hour,7);

g1=find(Lightening);

Vaccume_cleaner(hour)=power_pattern(hour,8);

h1=find(Vaccume_cleaner);

PoolPump(hour)=power_pattern(hour,9);

i1=find(PoolPump);

EWH(hour)=power_pattern(hour,10);

j1=find(EWH);

Hairdryer(hour)=power_pattern(hour,11);

k1=find(Hairdryer);

AC(hour)=power_pattern(hour,12);

L1=find(AC);

%------------------------------------------% % xlswrite(filename1,WHeate)

end

Indexx

a2=aa-a1;

% a3=sum((a2)/9);

b2=bb-b1;

c2=cc-c1;

d2=dd-d1;

e2=ee-e1;

f2=ff-f1;

g2=gg-g1;

h2=hh-h1;

i2=ii-i1;

j2=jj-j1;

k2=kk-k1;

L2=LL-L1;

BAR(2,1)=sum_E_Cost_SS;

[Torsten]

Determine the sizes of aa and a1 with the help of the size command and see whether they are equal.

(Most probably they are not).

Best wishes

Torsten.

[Zafar Iqbal]

>> size(aa)

ans =

     1     9

>> size(a1)

ans =

     1     3

>> size(a2) Undefined function or variable 'a2'. thanks torsten,i do this can u help me more as 1 9-1 3 should be ok

[Torsten]

But how to subtract an 1x3 array from an 1x9 array ? Impossible.

Best wishes

Torsten.

Answer 1

[Thorsten]

Check the sizes by adding

 whos aa
 whos a1

before the a2=aa-a1; line.

aa and a1 must have the same size, otherwise you get the error.

[Zafar Iqbal]

>> whos aa Name Size Bytes Class Attributes

aa        1x9                72  double

>> whos a1 Name Size Bytes Class Attributes

a1        1x3                24  double

>> whos a2=aa-a1; >> whos a2=aa-a1 >> whos a2 >>

[Zafar Iqbal]

 Thorsten i not understand if sizes is not equal then i have to make them equal and check the above code

[Zafar Iqbal]

 Thorsten thank you very much for u comments

[Thorsten]

Zafar, you want to subtract 3 values from 9 values. That's not defined. One way to handle this would be

len = min([numel(aa) numel(a1]);
a2 = aa(1:len) - a1(1:len);

But I have no idea whether this makes sense in your code.

Maybe something needs to be fixed in the computation of aa and a1 such that they cannot have different sizes.