Splitting a vector into vectors of different length

I want to split a vector with 90 arrays to 5 vectors with different lengths. The length of each vector is determined according to a normalized length like this: nl=[0.1642 .1516 .1259 .5583] Therefore the length of each vector is length=90*[0.1642 .1516 .1259 .5583]. But these lengths are not integer, and if i try to round this the length of will not equal to 90, it might be 89, 90, 91 or even 92 due to round of error.                        I would appreciate if anyone could assist me to write a code for this.

[Geoff Hayes]

You may need to provide an example. What do you mean by split a vector with 90 arrays?

[Alfonso Nieto-Castanon]

I am guessing you mean "a vector with 90 elements" instead of "a vector with 90 arrays"?

Answer 1

[Alfonso Nieto-Castanon]

This is interesting, perhaps something like this would do (this implements a greedy correction of your initial estimate of the desired lengths of each segment until the segment lengths add-up to the proper value):

 nl = [0.1642 .1516 .1259 .5583]; % normalized lengths of each segment
 N = 90;                          % total length of data to segment

 n = round(nl*N);                 % initial lengths of each segment
 while sum(n)~=N                  % if lengths do not add-up to N
   d = sign(N-sum(n));            % direction of change
   [~,i] = min(abs(n+d-N*nl));    % best segment to modify
   n(i) = n(i)+d;                 % change that segment length
 end

Then you can simply split your original vector using mat2cell:

 x = randn(1,90);
 y = mat2cell(x, 1, n);