Log equation log(x) not plotting correctly
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Here is my code. The log(x) function is plotting with negative values.
x=-10:1:10;
y_1=x;
y_2=exp(x);
y_3=log(x);
plot(x,y_1,'k-',x,y_2,'r--',x,y_3,'b:')
hold on
plot([-10 10],[0 0],'k',[0 0],[-5 5],'k')
axis([-10 10 -5 5])
grid on
title('Comparison Between the Exponential and Natural Logarithm Functions')
xlabel('x-axis')
ylabel('y-label')
legend('y=x','y=exp(x)','y=ln(x)')
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Antworten (3)
Ryan Takatsuka
am 16 Okt. 2018
y_3 contains complex numbers with real and imaginary components, and the plot() function only plots the real component of the complex number. Imaginary components are ignored.
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Steven Lord
am 16 Okt. 2018
Did you notice the warning you received in the Command Window when you ran this code?
Does real(y_3) look familiar in the context of your plot?
James Tursa
am 17 Okt. 2018
Since you are trying to graph the inverse of the functions, you should be switching the domains as well when you generate the points. So these lines:
y_3=log(x);
plot(x,y_1,'k-',x,y_2,'r--',x,y_3,'b:')
should be this instead:
y_3=log(y_2); % switched domain of log to y_2 instead of x
plot(x,y_1,'k-',x,y_2,'r--',y_2,y_3,'b:') % same change here
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