1 | initial version |

Here are two other options:

1) Use the Heaviside function:

```
f(x)=heaviside(x-1)-heaviside(x-3)
plot(f(x),(x,0,5))
```

2) define a Python function

```
def f(x,a,b):
if x>a and x<b:
return(1)
else:
return(0)
plot(lambda x: f(x,1,3),(x,-3,5))
```

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