1 | initial version |

You can use a sum of `heaviside`

functions.

```
f(x)=heaviside(x)+heaviside(x-1)+heaviside(x-2)+heaviside(x-3)
plot(f(x),(x,0,4),exclude=[0,1,2,3])
```

Or, you can do it with a python function.

```
def step(x):
if (0<x) and (x<1):
return(1)
elif (x<2):
return(2)
elif (x<3):
return(3)
else:
return(4)
plot(lambda x: step(x),(x,0,4),exclude=[0,1,2,3])
```

You could also use the `piecewise`

command.

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