Element-wise Complex Magnitude Calculation

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Gee
Gee 2019-7-15
评论： Raj 2019-7-16
I have an array of complex numbers (here is a snippet):
1273 + 1513i
1271 + 1481i
1256 + 1432i
1240 + 1347i
1210 + 1183i
1190 + 1029i
1169 + 870i
1156 + 714i
I'm aware the abs() function returns the complex magnitude of the vector from the origin 0,0 for each element in the vector, however is it possible to calculate the complex magnitude in an element-wise manner such that the returned value is the absolute length of all the elements in the complex vector with each previous element being treated as the origin rather than 0,0?

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回答（1 个）

Raj
Raj 2019-7-15
Why don't you just put it in a loop like this:
A = rand(5,1) + i*rand(5,1); % Assume this is your array
B=zeros(length(A),1);
B(1,1)=abs(A(1));
for ii=2: length(A)
B(ii,1)=abs(A(ii)-A(ii-1));
end
B is the matrix you need.
P.S.: There may be better way of doing this also.
  2 个评论
Guillaume
Guillaume 2019-7-15
编辑：Guillaume 2019-7-15
"P.S.: There may be better way of doing this also."
As shown by Bruno, the whole lot can be replaced by
B = abs(diff(B);
You never need a loop to calculate the difference between consecutive elements in matlab.
Raj
Raj 2019-7-16
@Guillaume Yes i got it. Thanks. I was preoccupied in something and was not thinking straight.

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