Plotting a function and a horizontal line segment

Andy Parsons

2017 8 15

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I need to plot f(x) = -ln(x+0.01)+e^x and g(x)=f(0) from x=0 to the second intercept point. I can plot the f(x) function, I just don't know how to plot both of them together (and how I plot a horizontal line segment). Thanks

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Andy Parsons 2017-8-16

are you able to elaborate on this? thanks

Star Strider 2017-8-16

See my Answer.

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回答（1 个）

Star Strider 2017-8-15

在 MATLAB Online 中打开

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Try this:

f = @(x) exp(x) - log(x+0.01);
x2nd = fzero(@(x) f(x)-f(0), 5);                    % Find Second ‘x’ At ‘f(0)’
x = linspace(0, 2);
y = f(x);
figure(1)
plot(x, y)
hold on
plot([0 x2nd], f(0)*[1 1], '-r')
hold off
grid