Error Integers can only be combined with integers of the same class, or scalar doubles when processing my sample?

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I Made
I Made 2013-3-11
I have a3, it's data < 64x490 int16 > , and i wanted to do *row1*row1*1 then row2*row2*2 to row49*row49*49 and have the sum of it. And apply it to all other columns too. i have tried using this code :
[g,h]=size(a3);
m=1:g;
t=sum(a3(m,:).*a3(m,:).*m);
but i get this error message : ??? Error using ==> times Integers can only be combined with integers of the same class, or scalar doubles.
this code work only if we remove the .*m and become like this:
[g,h]=size(a3);
m=1:g;
t=sum(a3(m,:).*a3(m,:));
but the formula from row1*row1*1 become row1*row1 only, can anyone correct my mistake ?

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回答（2 个）

Image Analyst
Image Analyst 2013-3-11
Try
m = int16(1:g);
Be aware that if the numbers get larger than 32767, they will clip.
Wayne King
Wayne King 2013-3-11
The error you get is because
m = 1:g;
gives you a double precision vector, while a3 is int16. You can remove that error by casting m to int16
m = int16(1:g);
or a3 to double precision
a3 = double(a3);
but then you're going to get dimension error. Did you mean to have a for loop?
  1 个评论
I Made
I Made 2013-3-11
编辑：I Made 2013-3-11
yeah you right, actually i need to be n=1,2,3,4,5... as i wanted to have a sum of(sampel(n)*sample(n)*n), where n is the number of row. to be more clear let me explain a bit :
so i have e.g
4 5 3
5 4 1
2 1 2
i wanted to got
78 60 23
and the process is like :
Column 1->(4*4*1)+(5*5*2)+(2*2*3) then Column 2->(5*5*1)+(4*4*2)+(1*1*3) then Column 3->(3*3*1+1*1*2+2*2*3)
How can i achieve this?

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