Help regarding For loop

Question

Md. Tanjin Amin 2017-7-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/347828-help-regarding-for-loop

评论： Walter Roberson 2017-7-10

采纳的回答： Jan

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hi,

i want to write the following equation in a for loop to store values for 1000 rows..Can anyone help please?

z(k)=lamda*x(k)+(1-lamda)*z(k-1)

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Answer 1

Jan 2017-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/347828-help-regarding-for-loop#answer_273353

在 MATLAB Online 中打开

z = zeros(1000, 22);
x = rand(1000, 22);
lamda = rand();
for k = 2 : 1000
  z(k, :) = lamda * x(k, :) + (1-lamda) * z(k-1, :);
end

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Md. Tanjin Amin 2017-7-10

data-result.csv

Hi, I am sorry. You are right the expected values were wrong. I have attached the corrected expected values. This is right this time. Can you give some time and help please?

Walter Roberson 2017-7-10

on_the_lam.m

Your first two lines of X from X.mat are the same. That cannot be explained with any lamda other than 0 .

Your other lines of expected output cannot be explained with lamda = 0.03 : they all require lamda = 1.0003

Even then your expected outputs are frequently wrong in the 4th digit.

See attached, which is configured for 1.0003

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Answer 2

Walter Roberson 2017-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/347828-help-regarding-for-loop#answer_273324

在 MATLAB Online 中打开

z(1) = rand();
x = randn(1,1000);
lamda = rand();
for k = 2 : 1000
  z(k)=lamda*x(k)+(1-lamda)*z(k-1);
end

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Md. Tanjin Amin 2017-7-8

Hi, Thank you. Atually, I should have been more specific. X is 1000*22 matrix and initial value of Z is zero (a 1*22 zero matrix)..Can you help please?

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