How to create a vector with a sequence 1, u, u(u-1), u(u-1)(u-2)....

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PJS KUMAR 2018-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/417974-how-to-create-a-vector-with-a-sequence-1-u-u-u-1-u-u-1-u-2

编辑： Walter Roberson 2018-9-7

采纳的回答： Walter Roberson

How to create a vector with a sequence 1, u, u(u-1), u(u-1)(u-2)....

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PJS KUMAR 2018-9-7

编辑：PJS KUMAR 2018-9-7

在 MATLAB Online 中打开

I tried as

A(1)=1;
For i=2:n
A(i)=A(i-1)*(u-(i-2))

Walter Roberson 2018-9-7

Does u(u-1) indicate indexing u at index u-1 or does it indicate multiplying the scalar u by (the scalar u minus 1)?

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Walter Roberson 2018-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/417974-how-to-create-a-vector-with-a-sequence-1-u-u-u-1-u-u-1-u-2#answer_335931

编辑：Walter Roberson 2018-9-7

在 MATLAB Online 中打开

syms u
n = 7;
A = [1,cumprod(u - (0:n))];
A =
[ 1, u, u*(u - 1), u*(u - 1)*(u - 2), u*(u - 1)*(u - 2)*(u - 3), u*(u - 1)*(u - 2)*(u - 3)*(u - 4), u*(u - 1)*(u - 2)*(u - 3)*(u - 4)*(u - 5), u*(u - 1)*(u - 2)*(u - 3)*(u - 4)*(u - 5)*(u - 6), u*(u - 1)*(u - 2)*(u - 3)*(u - 4)*(u - 5)*(u - 6)*(u - 7)]

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KALYAN ACHARJYA 2018-9-7

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在 MATLAB Online 中打开

u=input('Enter the value of u (more than 1): ');
n=input('Enter the numbers of Elements required: ');
a(1)=1;
for i=2:n
      a(i)=a(i-1)*(u-i+2);
end
disp(a);