When working with time series data, it is often useful to visualize the distribution of values over time. One common way to do this is by plotting a histogram on the y-axis at the end of the time series. In this article, we will explore three different ways to achieve this in Julia.

## Option 1: Using the Plots.jl Package

The Plots.jl package provides a high-level interface for creating plots in Julia. To plot a histogram on the y-axis at the end of a time series using Plots.jl, you can follow these steps:

```
using Plots
# Generate some sample time series data
time_series = rand(100)
# Create a histogram plot
histogram(time_series, orientation=:h, legend=false)
```

This code snippet first imports the Plots.jl package and generates some sample time series data using the `rand` function. Then, it creates a histogram plot using the `histogram` function, specifying the `orientation` parameter as `:h` to plot the histogram on the y-axis. The `legend` parameter is set to `false` to remove the legend from the plot.

## Option 2: Using the Gadfly.jl Package

The Gadfly.jl package is another popular choice for creating plots in Julia. To plot a histogram on the y-axis at the end of a time series using Gadfly.jl, you can follow these steps:

```
using Gadfly
# Generate some sample time series data
time_series = rand(100)
# Create a histogram plot
plot(x=time_series, Geom.histogram, Coord.cartesian(ymin=0, ymax=maximum(time_series)))
```

This code snippet first imports the Gadfly.jl package and generates some sample time series data using the `rand` function. Then, it creates a histogram plot using the `plot` function, specifying `Geom.histogram` as the plot type. The `Coord.cartesian` function is used to set the y-axis limits to ensure the histogram is plotted at the end of the time series.

## Option 3: Using the StatsPlots.jl Package

The StatsPlots.jl package provides a high-level interface for statistical plotting in Julia. To plot a histogram on the y-axis at the end of a time series using StatsPlots.jl, you can follow these steps:

```
using StatsPlots
# Generate some sample time series data
time_series = rand(100)
# Create a histogram plot
@df DataFrame(x=time_series) histogram(:x, orientation=:h, legend=false)
```

This code snippet first imports the StatsPlots.jl package and generates some sample time series data using the `rand` function. Then, it creates a histogram plot using the `@df` macro, which allows us to use the DataFrame syntax. The `histogram` function is used to create the histogram plot, specifying the `orientation` parameter as `:h` to plot the histogram on the y-axis. The `legend` parameter is set to `false` to remove the legend from the plot.

After exploring these three options, it is clear that the best choice depends on personal preference and the specific requirements of your project. Plots.jl, Gadfly.jl, and StatsPlots.jl all provide powerful tools for creating plots in Julia, so it is recommended to experiment with each package and choose the one that best suits your needs.