# How do I prevent my variable from being overwritten?

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vaishali el 20 de Sept. de 2013
Editada: Ashish Uthama el 14 de Oct. de 2013
from binary image like white color banana and background is black .I divided this in three part 20% ,60% and 20%Middle 60% part is used to measure width of banana.I have rows and cols coordinates; for each col (within 60%area) want to find width
[rows, cols] = find(BW == 1);
n1=min(cols); n2=max(cols);
m1=min(rows); m2=max(rows);
column = n1:n2 ;
a=length(column);
b=a*0.2;
n11=round(n1+b);
n22=round(n2-b);
columns = n11:n22 ;
for ii=n11:(n22);
for j=m1:m2
[row1 col]=find(BW(:,ii)==1) ;
x2=max(row1);
x1=min(row1);
d=x2-x1;
end
d1(ii)=d;
end
P=d1;
Desired P should be of size 1 x (length(columns))
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Image Analyst el 20 de Sept. de 2013
I gave you more compact and efficient code below, but you chose not to use it. Tell why.

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Image Analyst el 20 de Sept. de 2013
Your d is getting overwritten at each iteration of the j loop. You need to have d(j) instead of just d. But you actually don't even need it at all to find the first and last white pixel on a line. Just use find() with the 'first' and 'last' option:
for row = n11 : n22
x2 = find(BW(row,:), 1, 'last');
x1 = find(BW(row,:), 1, 'first');
d1(row) = x2 - x1;
end
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Image Analyst el 22 de Sept. de 2013
See if the file attached below does what you want.
vaishali el 23 de Sept. de 2013
sir, file is very useful for me. Thanks for helping me.

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