# Getting the same incorrect plot with exponential function

3 views (last 30 days)
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.

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 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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