MATLAB: How to add a column between two columns

columnsmatrixvector

I have a matrix 3×3 and a column vector 3×1. I'm trying to add the column vector between the second and third column of the 3×3 matrix.How can i add the column to the matrix?

M1=randi([-10,20],[3,3]); % M1 is 3×3 matrix

r=[5;5;5]; % r is 3×1 vector

Best Answer

out = [M1(:,1:2), r, M1(:,3)];

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A(:,5)=zeros(size(A,1),1)

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When you do

if isinteger(x)
   ((x)^(n)/factorial(n))
else 
   exp(x)
end

then you compute either ((x)^(n)/factorial(n)) or exp(x) . Because there is no semi-colon after the computation, the default action is taken with the result, and that default action is to display the value. But you are not storing the value -- which is something you need to do because you need to return computed values.

Hint: you probably need to read http://www.mathworks.com/help/matlab/learn_matlab/array-indexing.html

Other notes:

you cannot use a vector of values "^" something. You need to use the vector ".^" the somethng. Not x^n but x.^n . This is because in MATLAB, the "^" operator is matrix exponentiation not element-by-element exponentiation.
Your "while" condition is only going to be executed once. You start with n = 0, and use "while n<1" so it will be true the first time. Then you have n = n + 1 so the 0 will become 1, which is not <1 so the while will not be true the second time. It seems more likely to me that you want to use a "for" loop running up to the maximum order you have defined to expand to (order 6 is pretty common)
isinteger() does not test whether its input has integral value: it test whether the input is one of the integer data types, such as uint8 or int32
you are testing the entire vector x at one time, not individual entries in x
but why are you testing if x is integral anyhow?

Best Answer

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MATLAB: Matrix manipulations of columns

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