How can I evaluate a function at a vector and plot the returned values?

조회 수: 4 (최근 30일)
Using this function code: function [y1,y2] = f(x1)
y1 = 6*sin(x1) + cos(2*x1)
y2 = 12*sin(2*x1) + cos(4*x1)
end
I need to evaluate it at multiple points using the vector: x1 = linspace(0, 2*pi, 10);
So, I entered this code on my main script:
x1 = linspace(0, 2*pi, 10);
ii = f(x1)
It returns the error: Subscript indices must either be real positive integers or logicals.
Can someone please tell me what I am doing wrong? I know this is basic, but I am new to Matlab and my class on it isn't very helpful.

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Matt J
Matt J 2016년 10월 9일
First type
clear f
then re-run.
  댓글 수: 3
Matt J
Matt J 2016년 10월 9일
You had to do it because you had a variable named "f" already existing in the workspace. Avoid conflict between functions and variable names and there will be no need for this.
Japheth Gielen
Japheth Gielen 2016년 10월 9일
Oh ok I didn't realize. Thanks again for your help.

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