1 | initial version |

You can define a grid as follows:

```
sage: grid = Graphics()
sage: for i in range(-10,10,1):
....: grid += line([(i,-10),(i,10)])
....: grid += line([(-10,i),(10,i)])
sage: grid
```

Then you can add plots as follows:

```
sage: t = var('t')
sage: P = plot(sin(2*pi*t), (t,-10,10))
sage: P
sage: P + grid
```

2 | No.2 Revision |

Matplotlib is already shipped in Sage, and Sage uses it when it deals with plots. You can define a grid as follows:

```
sage: grid = Graphics()
sage: for i in range(-10,10,1):
....: grid += line([(i,-10),(i,10)])
....: grid += line([(-10,i),(10,i)])
sage: grid
```

Then you can add plots as follows:

```
sage: t = var('t')
sage: P = plot(sin(2*pi*t), (t,-10,10))
sage: P
sage: P + grid
```

3 | No.3 Revision |

Matplotlib is already shipped in Sage, and Sage uses it when it deals with plots. You can define a grid as follows:

```
sage: grid = Graphics()
sage: for i in range(-10,10,1):
....: grid += line([(i,-10),(i,10)])
....: grid += line([(-10,i),(10,i)])
sage: grid
```

Then you can add plots as follows:

```
sage: t = var('t')
sage: P = plot(sin(2*pi*t), (t,-10,10))
sage: P
sage: P + grid
```

**EDIT**: actually, there are `gridlines`

`gridlinesstyle`

and options, see the documentation. Example (without tuning):

```
sage: plot(sin(2*pi*t), (t,-10,10), gridlines=True)
```

4 | No.4 Revision |

Matplotlib is already shipped in Sage, and Sage uses it when it deals with plots. You can define a grid as follows:

```
sage: grid = Graphics()
sage: for i in range(-10,10,1):
....: grid += line([(i,-10),(i,10)])
....: grid += line([(-10,i),(10,i)])
sage: grid
```

Then you can add plots as follows:

```
sage: t = var('t')
sage: P = plot(sin(2*pi*t), (t,-10,10))
sage: P
sage: P + grid
```

**EDIT**: actually, there are `gridlines`

and `gridlinesstyle`

~~and ~~options, see the documentation. Example (without tuning):

```
sage: plot(sin(2*pi*t), (t,-10,10), gridlines=True)
```

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