columns of a matrix

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Josep
Josep on 21 Aug 2014
Commented: Andrew Reibold on 22 Sep 2014
I would like to know how to achieve one by one the columns of a matrix. Let me put here what I have done:
%COMBINATION OF ONE VARIABLE.
%we first read all the variables
Nby=53 ; % Le nombre des variables mesurées
y = xlsread('C:\Users\p105312\Desktop\dig+echg+washer+evap.xlsx' ,'E14:E66' ); % Les valeurs des variables mesurées
Nbz=5; % Le nombre des variables non mesurées
z =xlsread('C:\Users\p105312\Desktop\dig+echg+washer+evap.xlsx' ,'E75:E79' ); % Une estimation de la variable non mesurée extraite de la simulation
Nbc=15 ; % Le nombre de contraintes de systéme
Cp = xlsread('C:\Users\p105312\Desktop\dig+echg+washer+evap.xlsx' ,'D89:D94' ); % Les capacités calorifiques
y = xlsread('C:\Users\p105312\Desktop\dig+echg+washer+evap.xlsx' ,'E14:E66' ); % Les valeurs des variables mesurées
Ay = [ 1, 1, 1, 1, -1, -1, -1, -1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; Cp(2)*y(12), Cp(4)*y(13), Cp(5)*y(14), Cp(3)*y(15), -Cp(5)*y(16), -Cp(3)*y(17), -Cp(5)*y(18), -Cp(5)*y(19), 0, Cp(5)*y(21), Cp(5)*y(22), Cp(2)*y(1), Cp(4)*y(2), Cp(5)*y(3), Cp(3)*y(4), -Cp(5)*y(5), -Cp(3)*y(6), -Cp(5)*y(7), -Cp(5)*y(8), 0, Cp(5)*y(10), Cp(5)*y(11), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 1, 1, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, Cp(5)*y(18), Cp(5)*y(19), Cp(2)*y(20), -Cp(5)*y(21), -Cp(5)*y(22), 0, 0, 0, 0, 0, 0, Cp(5)*y(7), Cp(5)*y(8), Cp(2)*y(9), -Cp(5)*y(10), -Cp(5)*y(11), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, y(41), 0, -z(4), -y(42), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, y(26), -y(29), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, y(42), 0, 0, 0, 0, -y(43), 0, 0, 0, 0, 0, 0, 0, y(29), -y(34), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, y(43), 0, 0, 0, 0, 0, -y(44), 0, 0, y(34), -y(40), 0, 0, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, -1, -1, 0, 0, 0, 0, 0
; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, Cp(2)*y(49), Cp(5)*y(50), -Cp(1)*y(52), -Cp(5)*y(53), Cp(2)*y(45), Cp(5)*y(46), -Cp(2)*z(5), -Cp(1)*y(47), -Cp(5)*y(48)];
%----------------------------------
for j=1:Nby,
for i=1:Nbc,
A(i,j)=Ay(i,j);
end
A
end
  1 Comment
Matz Johansson Bergström
Matz Johansson Bergström on 21 Aug 2014
It would be nice if you could put the examples as a attached file and make the example smaller.

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Accepted Answer

Andrew Reibold
Andrew Reibold on 21 Aug 2014
Edited: Andrew Reibold on 21 Aug 2014
To call the entire contents of a column of a matrix, use matrix name and the colon operator (:)
Para encontrar la columna de una matriz, utilice el nombre de la matriz y el operador dos puntos (:)
A = [1 2 3;...
4 5 6;...
7 8 9];
A(:,1) = [1; 4; 7]
A(:,2) = [2; 5; 8]
and so on.
The colon tells Matlab to take the data from every row giving you the entire colomn.. The second number says which column to take from. You can put things like 'i' from your loop in there too.
  3 Comments
Andrew Reibold
Andrew Reibold on 22 Sep 2014
I honestly didn't see your follow up question unless about 3 weeks after you posted it. People often don't see new questions in the comments, including myself. Would recommend reposting this as a new, specific question, and include the detail you just did again.

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