Getting Error ''Function 'subsindex' is not defined for values of class 'function_handle'."

1 次查看（过去 30 天）
Will Sheppard
Will Sheppard 2018-12-11
评论： Steven Lord 2018-12-11
Please help, I am getting the above error when I am trying to input a function handle into another function. My code calling the function is as follows : a,b,c, and d are defined and have values. I do not understand what is wrong here. Thanks in advance.
  2 个评论
Steven Lord
Steven Lord 2018-12-11
BTW your if statement, in the absence of any limitations on a and d, is not generally true.
Let a = -1, b = 1, c = 0, d = 0.5. d is greater than a, but the plot created by the code below clearly crosses y = 0 near x = 1 and x = -1.
>> f = @(x) -cos(x)+0.5;
>> fplot(f)
fzero confirms that f has a zero.
>> r = fzero(f, 0)
Let's plot the zero and check.
>> hold on
>> plot(r, f(r), 'ro')
>> yline(0);

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2018-12-11
you define Newton_Raphson as a variable , the result of ismember . But then you have
Newton_Raphson(y)
which asks to index the array using the function handle y as the index .
I have no idea what your intent is.

类别

在 Help Center 和 File Exchange 中查找有关 Numerical Integration and Differential Equations 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by