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Find frequnecy of a data

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MUHAMMAD RAHMAT ASMAT
关闭： MATLAB Answer Bot 2021-8-20
Hello hyeee, from above statement i would like to find frequency of x below. i attach my code
%% Find frequency of the x data
x=[-0.7032 0.0299 -0.0173 -0.0299 0.0219 0.0017 0.0071 -0.0166 0.0128 -0.0038 -0.0050 0.0329 0.0153];
p=0;
m=length(x);
y=exp('-jw');
for i=1:m
p=p+x(i)*y^(1-i);
end
display(p);
and i encounter this after run
Undefined function 'exp' for input
arguments of type 'char'.
Error in G12_audio_code_project (line 67)
y=exp('-jw');
any idea what did i do wrong?
  1 个评论
Star Strider
Star Strider 2020-6-17
y = exp(-1j*w);
or, since ‘w’ is not defined, create ‘y’ as an anonymous function:
y=@(w)exp(-1j*w);
Experiment to get the result you want.
.

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回答（1 个）

Shivang Srivastava
Shivang Srivastava 2020-6-18
编辑：Shivang Srivastava 2020-6-18
From what I can understand you are facing trouble using exp() function when you are trying to find the frequency of data in array x.
In my opinion, one of these points is causing you the trouble:
  • The function definition of exp() only takes X -Input array which contains datatype single | double.
  • If you are trying to use j & w as a variables you should remove the single quotes and declare the variables before using them.
I suggest using the following command if you are taking exponent of your x array
x=[-0.7032 0.0299 -0.0173 -0.0299 0.0219 0.0017 0.0071 -0.0166 0.0128 -0.0038 -0.0050 0.0329 0.0153];
y = exp(x);
Refer to this link to exp() documentations for more information on using exp function: https://in.mathworks.com/help/matlab/ref/exp.html

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