MATLAB: Sum, vector elements, except i-th

elementssumvector

hi,

how can I sum vector elements, say v = rand(1,30), except 12th one?

thanks,

Best Answer

You can always do the sum, then subtract that single element, 12th, from the sum.

v = rand(1,30);
sum_except12=sum(v)-v(12)

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MATLAB: Sum every i-th column in matrix seperately

Try sum(A(:,[1 4]))

where A is your random matrix.The line above will give you the sums of column 1 and 4.

ex: A=spiral(4)

sum(A(:,[1 4]))

ans = 34 46

MATLAB: Sum every i-th row in matrix seperately

function [Qs] = moyenneQ (yearMin, yearMax)
%Function that calculates the annual average from the data at the daily time step.
Data = load('QsMC_Mars.mat');
QsMC = Data.QsMC;
nYear = yearMax - yearMin + 1; 
Qs = zeros(nYear, size(QsMC, 2));  % Pre-allocate
iStart = 1;
for i = 1:nYear
   year = yearMin + i - 1;
   nbrJour = 365 + leapyear(year);
   iEnd = iStart + nbrJour - 1;
   if iEnd >= size(QsMC, 1)   % Not "length"!
      break
   end
     Qs(i, :) = sum(QsMC(iStart:iEnd,:));
     iStart = iEnd+1;
  end
  end

Best Answer

Related Solutions

MATLAB: Sum every i-th column in matrix seperately

MATLAB: Sum every i-th row in matrix seperately

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