Dividing two non-zero arrays gives me an array of zeros

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John Draper
John Draper 2016-2-12
编辑： Walter Roberson 2016-2-12
Hi, I'm dividing two arrays of equal size by eachother. These arrays do have 0's in them but not all the values are zero.
When I Divide the two I get an array of equal size to them both but all elements in the array are zero.
Here is an example
if true
x = ones(100)
y = ones(100)
z = x./y
z
% code
end
except when I return my 'z' I get an array of zeroes. Does anyone have any idea why this is and what a fix might be?
My x is a 100x100 double and my y is 100x100 double
Any help appreciated as always
  2 个评论
jgg
jgg 2016-2-12
Does that code in your example generate all zeroes for you? It doesn't on my system (Windows 10 x64, R2015a)?
John Draper
John Draper 2016-2-12
编辑：John Draper 2016-2-12
Yes, for me it does.
whos z is a 100x100 double in my code

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回答（1 个）

Walter Roberson
Walter Roberson 2016-2-12
Your actual arrays are one of the integer data classes, such as if you are trying to divide one uint8 image by another . You need to double() the arrays before doing the division.
  2 个评论
John Draper
John Draper 2016-2-12
编辑：Walter Roberson 2016-2-12
Here is a section of my code, does this look correct?
ii = double(b_c(:,:,1))
jj = double(b_c(:,:,2))
kk = double(b_c(:,:,3))
rMPCdouble = double(rMagPriCubed)
b_ci = ii./rMPCdouble;
b_cj = jj./rMPCdouble;
b_ck = kk./rMPCdouble;
Walter Roberson
Walter Roberson 2016-2-12
编辑：Walter Roberson 2016-2-12
Looks plausible.
new_b = b_c ./ double(rMagPriCubed(:,:,[1 1 1]));
and now you could select layers from new_b if you wanted.

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