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Getting the same incorrect plot with exponential function

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Mohamed Aziz Elouaer
Mohamed Aziz Elouaer on 11 Oct 2021
Answered: Walter Roberson on 11 Oct 2021
I need to plot this function:
y= e^(2x)-3*e(x)
But matlab keeps showing me the incorrect plot, I mean the same incorrect one even if I change the function.

Answers (2)

Image Analyst
Image Analyst on 11 Oct 2021
That is the correct plot for that equation. What were you expecting? Why do you say it's wrong?
x = linspace(0, 10, 1000);
y = exp(2 * x) - 3 * exp(x);
plot(x, y, 'b-', 'LineWidth', 2);
grid on;
xlabel('x', 'FontSize', 18)
ylabel('y', 'FontSize', 18)
And if I change the equation, the plot looks different.

Walter Roberson
Walter Roberson on 11 Oct 2021
y = @(x) exp(2*x)-3*exp(x)
y = function_handle with value:
@(x)exp(2*x)-3*exp(x)
exp(2*10)
ans = 4.8517e+08
fplot(y, [-2 10])
Looks correct to me. You are asking to plot up to

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