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plot(f,(x,-3,3)) defines an object. From a .sage script, this is just the object.

When you call an object from the command line, it wants to be represented, by calling the hidden .__repr__() method. For a plot object, the .__repr__() method just calls the .show() method.

Hence, if you want your .sage script to show the plot object you defined, you should tell it explicitely, by writing:

plot(f,(x,-3,3)).show()

instead of

plot(f,(x,-3,3))

As a comparison, it is the same difference between

2

and

print(2)

Both will return 2 in the command line, but only the second will write something when called from a .sage script.

plot(f,(x,-3,3)) defines an a graphical object. From a .sage script, this is just the object.

When you call an object from the command line, it wants to be represented, by calling the hidden .__repr__() method. For a plot object, the .__repr__() method just calls the .show() method.

Hence, if you want your .sage script to show the plot graphical object you defined, defined with the command plot, you should tell it explicitely, by writing:

plot(f,(x,-3,3)).show()

instead ofof just

plot(f,(x,-3,3))

As a comparison, it is the same difference between

2

and

print(2)

Both will return output 2 in the command line, but only the second will write something when called from a .sage script.