# Some Visualization Libraries to Choose From

**A quick reference on the many options to visualize data with Julia.**

There are multiple plotting packages for Julia worth checking:

Package | Description | Examples | Tutorial |
---|---|---|---|

Plots.jl | provides a single API to access multiple “backends”, which inlclude Matplotlib (Pyplot), Plotly, and GR. | Pyplot, Plotly, GR. | Docs |

StatsPlots.jl | A drop-in replacement for Plots.jl that contains specialized statistical plotting functionalities. | StatsPlots.jl repository | Plots.jl docs |

Makie.jl | A high-performance plotting ecosystem with OpenGL, Cairo and WebGL backends. It’s great for publication-quality plotting, but can be a little bit slow to load and use | Docs | |

VegaLite | A Julia wrapper for the Vega-Lite library. Great for interactive graphics. | Docs. | |

Gadfly | Based on the R package gglot2, very well suited for statistics and machine learning. | Docs |

Detailed documentation can be found in each package, and in the referenced tutorials and examples pages.

To keep this tutorial series as much as self-contained as reasonably possible, let’s go over a few examples here:

## Plotting a Function with Plots.jl

```
using Plots
# 10 points of random data, in two columns
x = 1:10;
y = rand(10, 2);
plot(x, y, title = "Two Lines", label = ["Line 1" "Line 2"], marker = ([:hex :d], 8), lw = 3)
xlabel!("My x label")
```

## Displaying a Pseudocolor Plot of a 2D Array

One way of doing a 2d pseudocolor plot with Julia is to use the ‘heatmap’ function.

```
using Plots
# Generate some 2D data
x = LinRange(-1,1,100);
Z = zeros(100,100)
for i=1:100, j=1:100
r = x[i]^2 + x[j]^2
Z[i,j] = sin(10*r) / (1+r)
end
heatmap(Z)
```

## Calling Matplotlib’s PyPlot with PyPlot.jl

Alternatively, we could also use the PyPlot package, which provides a direct interface to Matplotlib’s Pyplot via PyCall, namely to the matplotlib.pyplot module.

For example, the above example can be modified as follows:

```
using PyPlot # Replace Plots with PyPlot
pcolormesh(Z) # Replace heatmap with pcolormesh
```

to produce the following plot:

Note that using both PyPlot and Plots could result in errors, so native Julia libraries should be preferred.