How to resize this vector?

dsp
2016 1 25
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更新时间：2016 7 8
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I have a vector A of 64 data points which corresponds to 15.66 cm projection. I need to get a vector B of projection data points of size 64 which corresponds to 0.48 cm in the middle of A. How to get it?

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Walter Roberson
Walter Roberson 2016-1-25

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extract_starting_from = 12.345; %for example
extract_length = 0.48;
orig_X = linspace(0, 15.66, length(A));
new_X = linspace(extract_starting_from, extract_starting_from+extract_length, 64);
extracted_A = interp1(orig_X, A, new_X);

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dsp
dsp 2016-7-7
编辑：dsp 2016-7-7
on a related note,
I have a vector A of 64 data points which corresponds to 2 cm projection. I need to get a vector B of projection data points of size 64 which corresponds to 4 cm in the middle of A. How to get it?
Is extrapolation any good or adding zero will be good?
extract_starting_from = -1; %for example
extract_length = 4;
orig_X = linspace(0, 2, 64);
new_X = linspace(extract_starting_from, extract_starting_from+extract_length, 64);
extracted_A = interp1(orig_X, A, new_X,'pchip','extrap');
Walter Roberson
Walter Roberson 2016-7-8
? How can you get 4 cm in the middle of something that is only 2 cm long?
'pchip' might be valid for your purposes; 'linear' might be valid. Also specifying 0 instead of 'extrap' might be valid. It depends on what you are modeling.

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