# General 2D plotting example

Here is an example python script for making a 2D density plot.

```python
import numpy as np
import matplotlib
import matplotlib.pyplot as plt
import h5py
from mpl_toolkits.axes_grid1 import make_axes_locatable

dnamein='./output/'  # directory where the file is located
dnameout='./pngs/'   # directory where the plot will be saved

DE = 0
i = 0

mp = 1.672622e-24  # mass of hydrogen atom, in grams
kb = 1.380658e-16  # Boltzmann constant in ergs/K

for i in range(0, 200):
    f = h5py.File(dnamein + str(i) + '/' + str(i) + '.h5.0', 'r')
    head = f.attrs

    gamma = head['gamma']        # ratio of specific heats
    t = head['t']                # time of this snapshot, in kyr
    nx = head['dims'][0]         # number of cells in the x direction
    ny = head['dims'][1]         # number of cells in the y direction
    nz = head['dims'][2]         # number of cells in the z direction
    dx = head['dx'][0]           # width of cell in x direction
    dy = head['dx'][1]           # width of cell in y direction
    dz = head['dx'][2]           # width of cell in z direction
    l_c = head['length_unit']
    t_c = head['time_unit']
    m_c = head['mass_unit']
    d_c = head['density_unit']
    v_c = head['velocity_unit']
    e_c = head['energy_unit']
    p_c = e_c  # pressure uses same unit as energy density

    d = f['density'][:]
    p = f['pressure'][:]

    time = head['t'][0]

    mu = 1.0  # mean molecular weight

    # n = number density (particles/cm^3)
    n = d / (mu * mp)

    #vmin and vmax depend on the simulation. reference the documented examples

    image = plt.imshow(d.T, origin='lower', cmap='viridis', vmin=1.8, vmax=2.8)

    cb = plt.colorbar(image, ticks=np.arange(1.8, 2.8, 0.2), label='density')

    plt.suptitle(f't={time:.2f}', fontsize=12)

    plt.savefig(dnameout + str(i) + ".png", dpi=300)
    plt.close()