Help regarding For loop

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)

Answer 1

[Jan]

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

[Md. Tanjin Amin]

Hi, the code runs ..still the result is not satisfactory....I am attaching the data file and expected result for lamda=0.03. I have done the calculation using excell. Can you look again and help please? Thank you.

[Walter Roberson]

Your expected values are wrong, not even self-consistent.

See attached code and plots.

[Md. Tanjin Amin]

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]

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

Answer 2

[Walter Roberson]

z(1) = rand();
x = randn(1,1000);
lamda = rand();

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

[Md. Tanjin Amin]

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?