Function out of proportion/wrong while in matlab?

Hi, I'm trying to use a function I made using graphing calculators, but when i type it in and plot in in matlab, it's not the same line.

syms x
y2 = 0.0000772436429838*x^3+0.0146583319491*x^2 -0.184551271403*x+4.99872818128;
fplot(y2)

When It should look something more like this according to both geogebra and desmos graphic calculators (Screenshot attached)

[Moisés Abel]

Thanks to everyone who answered so quickly, you were all of great help!

Answer 1

[Dyuman Joshi]

You have to define the x-range over which you want to plot the function.

The default range is [-5,5] - Refer to the documentation of fplot for more information.

syms x
y2 = 0.0000772436429838*x^3+0.0146583319491*x^2 -0.184551271403*x+4.99872818128;

%Calling fplot with a specific range for x values
fplot(y2,[-250 100])

%Modifying to make the plot look similar to the screenshot

%Changing x and y limits
xlim([-250 250])
ylim([-100 200])

%Add lines to appear as the axes
xline(0)
yline(0)

[Voss]

An alternative to using xline and yline to plot the x- and y-axis lines is setting the XAxisLocation and YAxisLocation properties of the axes to 'origin', which also puts the x- and y-ticks along the axis lines.

syms x
y2 = 0.0000772436429838*x^3+0.0146583319491*x^2 -0.184551271403*x+4.99872818128;

%Calling fplot with a specific range for x values
fplot(y2,[-250 100])

%Modifying to make the plot look similar to the screenshot

%Changing x and y limits
xlim([-250 250])
ylim([-100 200])

%Setting up X- and Y-Axis
set(gca(),'XAxisLocation','origin','YAxisLocation','origin')

[Dyuman Joshi]

Yes, Spot on.

Though, you should change the comment above the set() call, @Voss.

[Voss]

Right! Done.