[討論]一個function，不知道bug怎麼解

[war0tft (Dante)]

請求板上高手
   幫同學debug,就這兩個式子，matlab不給過
   請板上高手解答，很少發文，如有冒犯，請多多指教， 謝謝。

function [ssum,b,x] = cosser(x,tol,nmax)
% cosser  Evaluate the series representation of the cosine function
% x = argumant of the cosine function, i.e. to compute cos(x)
% tol = (optional) tolerance on accumulated sum, default: 5. e-9
% series is terminated when abs(t_k/s_k) < delta. t_k is the kth term and
% s_k is the sum after the kth term is added
% nmax = (optional) maximum number of terms added in the expansion,
% default: nmax = 15
% output: b = the number of terms added in the series
% output: ssum = value of series sum after the tolerance is met
if nargin < 2, tol = 5.e-9;end
if nargin < 3, nmax = 15; end
term = 1; ssum = 1; b = 1;
for k = 2: 2: (2*nmax) ;
 *  term = -term *(x^2)/(k*(k-1));
 *  ssum = sum + term;
   if (term/ssum) < tol, break
   end
end
b= k/2 + 1;
end

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推 summitstudio:多了一個 end？
→ shomingchang:sum 沒給值? x.^2?
→ war0tft:剛剛發現，只能在function裡面給值才可以跑，請問要怎麼才
→ war0tft:能在matlab直接給值去跑答案?
→ shomingchang:你是不是把ssum打成sum了?
→ shomingchang:還有你 x 是一個陣列還是一個數值?
→ war0tft:x = argumant of the cosine function ,它是一個值。