cosine estimate taylor series

1 次查看（过去 30 天）
Elena
Elena 2022-2-22
评论： KSSV 2022-2-22
sos, trying to fix in 30 min, not sure what is going wrong, im getiing 1.6985 e 5 and answer should be 0.6916.
function res = cosineEstimate(ang, k)
ang = '045-00-00'
k = 2
%DMS to degrees
angSplit = strsplit(ang, '-')
firstCell = angSplit(1)
angForm = str2double(firstCell)
%degree to rad
rad = (angForm/180)*pi;
r = 0;
for n = 1:k;
e = 2*n
f= factorial(e)
m = (-1)^(n)
r = r + m*(angForm^e)/f
res = r
end
end

请先登录，再回答此问题。

回答（2 个）

KSSV
KSSV 2022-2-22
编辑：KSSV 2022-2-22
Ran in:
x = 45*pi/180 ;
n = 10 ;
thesum = 0 ;
for i = 0:n
thesum = thesum+(-1)^i*x^(2*i)/factorial(2*i) ;
end
[cos(x) thesum]
ans = 1×2
0.7071 0.7071
  1 个评论
KSSV
KSSV 2022-2-22
Ran in:
cos(pi/4)
ans = 0.7071
How it is 0.6916? Are you targetting different angle? If not reduce the value of n and see.

请先登录，再进行评论。

Sulaymon Eshkabilov
Ran in:
Here is the corrected code:
ang = '045-00-00';
k = 2;
res = cosineEstimate(ang, k)
res = -0.6169
function res = cosineEstimate(ang, k)
%DMS to degrees
angSplit = strsplit(ang, '-');
firstCell = angSplit(1);
angForm = str2double(firstCell);
%degree to rad
RAD = (angForm/180)*pi;
res= 0;
for n = 1:k
res = res + ((-1) .^ (k-1) .* RAD .^ k) ./ factorial(k);
end
end

类别

在 Help Center 和 File Exchange 中查找有关 Discrete Fourier and Cosine Transforms 的更多信息

标签

产品


版本

R2021a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by