MATLAB: Newbie needing to create matrix elements dependent on other elements

dependent matrix elementsmatrix manipulation

I have a matrix of many rows and 6 columns

A1 A2 A3 A4 A5 A6 
B1 B2 B3 B4 B5 B5
etc

I want to create a new column 7 that will contain

A7 = sqrt(A1^2+A2^2+A3^2)
B7 =sqrt(B1^2+B2^2+B3^2)
etc.

How would I do this please?

thanks

Best Answer

A = your Nx6 matrix
A(:,7) = sqrt(sum(A(:,1:3).*A(:,1:3),2));  % The RSS of the 1st 3 columns by row

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MATLAB: Newbie question

pi is already defined; it is not a good idea to redefine it.

Remove your BG=5 line.

Immediately before you calculate Lvalues, add the line

BGs = [1 2 3 4 5 6 7 8 9 10];  %the list of values you want to use
L_pB = zeros(1,length(BGs));   %more efficient to preallocate
for K = 1 : length(BGs)
  BG = BGs(K);

Then, change your assignment that has L_pB on the left hand side, to instead of L_pB(:,K) on the left hand side. And then add the lines

end
plot(BGs, L_pB, 's')

right after that.

I have, though, not gone through the code to be sure that you only calculate a single L_pB value per BG value. If instead multiple values are calculated each time, change the 1 in the "zeros" line to be the number of items that are calculated each time (e.g., 7)

I did not join the points together in the plot because it is not clear to me that the points could be considered ordered or continuous.

MATLAB: Newbie question

5+20*log((sqrt(2*pi*Nvalues))./tanh(sqrt(2*pi*Nvalues)))

Notice './' instead of '/'.

help rdivide

./ Right array divide. A./B denotes element-by-element division. A and B must have the same dimensions unless one is a scalar. A scalar can be divided with anything.

Best Answer

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