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How to plot the equations

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ting po chun
ting po chun 2023-2-16
评论： Anurag Ojha 2023-2-17
Hi:
I want to plot the equations such as the following screenshot. The have two different series (j & i), Thanks!!
  2 个评论
Luca Ferro
Luca Ferro 2023-2-16
could you add some more context?
such as the value of the constants, what is j and what is i,...
ting po chun
ting po chun 2023-2-16
Hi :
I am sorry without many details. The fm = c / 2d 、d=0.02、(ωm = 2πfm / fs )、fs=44100、(ω = c*k)、k is a vector of sound wave arrival。
i is the order , 1、2、3..... and the j is the complex number.
Thank you !!!!

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回答（2 个）

Oguz Kaan Hancioglu
Ran in:
You can plot using symblic toolbox. As @Luca Ferro mentioned you need to specify more information.
I created a short example for you. After defining symbolic variable, you can plot using fplot command. However, flpot just only draw one symbolic variable. You can enter frequency range as a second argument to fplot.
syms w
i = 1; j = 1; fs= 1; d = 1;
secondEq = (2*j)^(-i)*sin(pi*w*fs*d)
secondEq = 
fplot(secondEq,[-pi,pi])
Anurag Ojha
Anurag Ojha 2023-2-16
Ran in:
As per my understanding, you are facing an issue in plotting the graph for the equation. Kindly store the output in an array according to the condition and then plot using “plot()” function.
For example, if I take the equation on similar lines as your equation and taking a assumption that fs,G and d are constants say,
fs = 10;
d = 5;
G = 20;
C = fs*d;
% Now let
wm = 10;
% for w < wm
% Y = min(2*G,sin(c*w));
% Else
% Y = sin(c*w);
% So simply you could do it like this.Create an array to store result
y = [];
%storing values according to condition in an array
for w = linspace(1, wm, 10)
y(w) = min(2*G,sin(C*w)^-1);
end
for w = linspace(wm + 1, 20, 10)
y(w) = sin(C*wm)^-1;
end
%plot it against time stamps
plot(linspace(1, 10, 20), y);
So you can get your plot like this.To explore more about plot function, loops and conditional statements go through the link attached below:
PLOT FUNCTION
Loops
Conditional Statements
Hope it helps!
  2 个评论
ting po chun
ting po chun 2023-2-17
Thank for your help.
I like to ask more. If i want to X become to frequency range of a audio wav file as the picture. The code how to do ?
Thank you !!!
Anurag Ojha
Anurag Ojha 2023-2-17
You can refer to this MATLAB documentation to know how to plot a audio file
Plot Audio files
Hope it helps!!

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