My for loop isn't working
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dim_Bx = 377;
dim_By = 494;
for deg = 1:180
for img_line_B = 1:1000
Co_Bx(img_line_B,1) = img_line_B * cosd(deg) + (dim_Bx/2);
Co_By(img_line_B,2) = img_line_B * sind(deg) + (dim_By/2);
end
Ref_Bx = round(Co_Bx(:,1));
Ref_By = round(Co_By(:,2));
end
Why does Co_By constantly give me 247??
Thanks!!
1 个评论
Stephen23
2017-1-12
@Brian Cheung: your code is very badly formatted. If you used consistent formatting (e.g. the MATLAB default) then your problem would be a bit easier to identify:
dim_Bx = 377;
dim_By = 494;
for deg = 1:180
for img_line_B = 1:1000
Co_Bx(img_line_B,1) = img_line_B * cosd(deg) + (dim_Bx/2);
Co_By(img_line_B,2) = img_line_B * sind(deg) + (dim_By/2);
end
Ref_Bx = round(Co_Bx(:,1));
Ref_By = round(Co_By(:,2));
end
Now you can clearly see that you have two loop. Think about what the outside loop is doing.
回答（1 个）
James Tursa
2017-1-12
1 个投票
Because you are constantly overwriting the value assigned to Co_By(img_line_B,2) with a new value because all of this is inside the for deg=1:180 loop. So only the last value sticks, and that last value used deg=180, so sind(180)=0 and the only thing left to assign is the dim_By/2 part (=247).
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2017-1-12
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