How do i create an array with a for loop?

Question

Brendan Querey 2020-11-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/651463-how-do-i-create-an-array-with-a-for-loop

评论： Walter Roberson 2020-11-17

I'm trying to create a an array of ten numbers randomly generate from a normal distribution, and I also need the initial number to not have the same function as the remaining 9.

P_t = normrnd(72.7,7.6);
p_t = normrnd(12.6,3.9);
price = zeros(10:1);
 
for n = 1:10
    if n == 1 
        price(n) = P_t;
    else
        price(n) = .8 * P_t + p_t;
    end
end

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Answer 1

Walter Roberson 2020-11-17

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/651463-how-do-i-create-an-array-with-a-for-loop#answer_547818

编辑：Walter Roberson 2020-11-17

在 MATLAB Online 中打开

P_t = @() normrnd(72.7,7.6);
p_t = @() normrnd(12.6,3.9);
price = zeros(10,1);
 
for n = 1:10
    if n == 1 
        price(n) = P_t();
    else
        price(n) = .8 * P_t() + p_t();
    end
end

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Brendan Querey 2020-11-17

what does @() do?

Walter Roberson 2020-11-17

https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html

@() introduces the definition of an anonymous function that does not expect any parameters.

In the above code, each time P_t() is encountered, it would execute the function body, normrnd(72.7,7.6) , generating a new random number with the given distribution.

The code you were using was generating one single random number from each of the two distributions, and then using that same number for each iteration.

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