I am facing problem with big fraction

2 次查看（过去 30 天）

Muhammad Usman 2019-10-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/483787-i-am-facing-problem-with-big-fraction

评论： Walter Roberson 2019-10-6

Hello everyone,

When i am writing the following code, "sumx" returns me value in fraction, i want to show my result in terms of "pi". Need some help

n=3;
k=1;
for S=1:n
    if k==n
        sumx=pi/2;
    else
        sumx = pi/2+(2/pi)*((((-1).^k(1,:))-1).*cos(k(1,:)*x)./(k(1,:).^2));
        plot(x,sumx,'r-')
    end
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Walter Roberson 2019-10-6

在 MATLAB Online 中打开

What do you expect your values to look like? Are you expecting a vector something like

(35184372088832*pi^2 - 219978174876521)/(70368744177664*pi), 
(281474976710656*pi^2 - 1766249117313443)/(562949953421312*pi)

Did you notice that your k does not change in the loop, and so k==n is either always true (if n happens to be 1, which it is not) or else always false (if n happens to be different from 1, which is the case.)

Did you notice that your statements in the loop do not depend upon S?

Did you notice that "plot on" is not set so you are plotting the same thing every time?

Did you notice that k is a scalar, but you are indexing it as if it were a row vector or 2D array ?

请先登录，再进行评论。

请先登录，再回答此问题。