Gnuplot plotitng blank screen.

[colt]

Hi, I am trying to make two semi-parabolic curves close one another, like if they were leaves, but when I enter the last command, it doesn't plot anything, just shows a blank screen (it shows the curve with plot only replot makes everything blank). Here is the code:

set xrange [0:10]
plot  x*x
set origin 10,100  //Here my idea is to start at the end of first graph so I can go back to the start (0,0) with a new plot
set xrange [0;-10] //Setting up to return to origin, starts with 0 (10), go to -1(9), to 2(8) until -10(0)
replot -x*x //Has to be a negative function to make y values decrease

What I can be doing wrong? Thanks for the help

[george_toolan]

You should really check your spelling ;-)

Here's what you did:

set xrange [0:10]
plot  x*x
set origin 10,100
set xrange [0:-10] // that's a ":" and not a ";"
replot -x*x
set origin 0,0
replot

[colt]

Thanks. What I need to do to create a parabolic curve that "closes" the first one, generating a closed area?
I attached a sketch that I did with Gimp to illustrate what I mean.

[RupertPupkin]

The other parabola is not too hard to figure out:

[colt]

Incredibly well thought, just amazing your solution. Many thanks