How to plot multiple graph
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Hello all
I am going to plot f= sin(5x)/x^3 and its derivative f '(x) within the domain x ∈[0.1,0.4]using semilogy plot.
답변 (2개)
Jon
2020년 9월 21일
I don't have the symbolic toolbox, but I could get your code to work by modifying as follows. Note I did not include the line syms x as I don't have the symbolic toolbox.
x=logspace(0.1,0.4);
f =sin(5*x)./(x.^3);
Df= gradient(f)./gradient(x);
semilogx(x,f,'g')
hold on
semilogx(x,Df,'r')
grid
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Jon
2020년 9월 21일
The key line is
Df= gradient(f)./gradient(x)
This gives a simple numerical approximation to the derivative.
You can see what the gradient function does by typing doc gradient on the command line.
Ameer Hamza
2020년 9월 21일
You are using the symbolic variables incorrectly. Check this code
% clc; clear all; close all;
syms x
f(x)=sin(5*x)./(x.^3);
Df = diff(f,x);
xv = logspace(0.1,0.4);
semilogx(xv, f(xv), 'g')
hold on
semilogx(xv, Df(xv), 'r')
grid
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Image Analyst
2020년 9월 21일
And you might add a legend so you know what color is what.
legend('Original Signal', 'Derivative', 'Location', 'northeast');
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