Create an alternating matrix
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Hello. I am looking to create a 1xn matrix where I would enter a max value and a step size for the vector where each value alternates sign. For example I would enter a max value of 20 and a step size of 5 and the result would produce the following matrix;
[0 5 -5 10 -10 15 -15 20 -20]
Thank you in advance.
采纳的回答
There are many ways. Here's one.
% parameters
st = 5;
ev = 20;
A = [0 kron(st:st:ev,[1 -1])]
Here's another:
B = repmat(0:st:ev,[2 1]).*[1; -1];
B = B(2:end)
Here's another:
C = [0 repelem(st:st:ev,2)];
C(3:2:end) = -C(3:2:end)
更多回答（1 个）
maxV = 20;
stepS = 5;
I = zeros(1,2*(maxV/stepS)+1);
I1 = 0:stepS:maxV;
I2 = -I1(2:end);
I(1:2:end) = I1;
I(2:2:end) = I2;
I
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