What does this code exactly do using spdiags

2016 5 4
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更新时间：2016 5 9
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Hi what does the following code actually do? It states in the remarks that it is carrying out the hilbert transform but I am not so sure. I am not able to understand what is being acheieved by using the spdiags function also.a is a structural matrix, b consists of time domain data
a.b=ifft(spdiags([1:length(a.b)]'<length(a.b)/2,0,length(a.b),length(a.b))*fft(a.b))

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