assign value for field in a struct using a loop
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Hi
am trying to save variables into structure using a loop but i have a problem assigning fieldnames and values so what i did was
b = 1:50;
field = ['Contrast_' num2str(b) ] yet i dont know how to assign the value of Contrast to this field.
i tried something like value = (field) or value = [field] but it doesn't retrieve the value of the variable.
what am doing is measuring contrast for each slice for an image in a loop so it is important for me to relate the slice number to the contrast value but i also want to save all of the contrast values in struct in the end where the field name is the contrast_'sliceNumber'.
any help is appreciated.
thanks Hannah
采纳的回答
Jan
2014-5-4
As Image Analyst has written already, hiding an index in teh field name is a bad idea:
for k = 1:10
S.(sprintf('Contrast_%d', k)) = rand;
end
It is much better to use an array:
S.Contrast = zeros(1, 10);
for k = 1:10
S.Contrast(k) = rand;
end
更多回答（1 个）
Image Analyst
2014-5-4
2 个投票
This is not advised. Read the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F You should use one field that is an array, not tons of fields with different names.
2 个评论
Hannah
2014-5-5
Image Analyst
2014-5-5
That should not be the case. In fact it should be the opposite. What you want to do is more complicated, as you know because you have to ask us. Jan gave you the code. It's not difficult at all - how much simpler can it be?
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