Histogram Dealing with Two Variables

I am trying to graph a histogram that displays the distribution of L_blue_galaxy/L_blue_MW=10^(-20.8-M)/2.5. So, I need to evaluate for each galaxy the above quantity and then plot the histogram of it for all the galaxies within 20 Mpc (it will be a histogram of the number of galaxies vs L_blue_galaxy/L_blue_MW). This will allow me to evaluate how many galaxies are less luminous or more bright than the Milky Way.

An example of what I am trying to do is attached.

[Star Strider]

A bit more information would be helpful.

What data do you have? I see three variables: ‘L_blue_galaxy’, ‘L_blue_MW’, and ‘M’.

What variables do you want to plot in the histogram?

[Image Analyst]

I assume L_blue_MW is a constant, and L_blue_galaxy is a vector, so you basically have

intensityRatios = L_blue_galaxy / L_blue_MW

which gives you the ratio of each galaxy's intensity to the Milky Way's intensity.

I have no idea what the "10^(-20.8-M)/2.5" is for, and why you're setting the intensity ratios equal to that expression. And like Star said, we don't know the value or significance of M perhaps a more descriptive name might help with that).

[Image Analyst]

I assume L_blue_MW is a constant, and L_blue_galaxy is a vector, so you basically have

intensityRatios = L_blue_galaxy / L_blue_MW

which gives you the ratio of each galaxy's intensity to the Milky Way's intensity.

I have no idea what the "10^(-20.8-M)/2.5" is for, and why you're setting the intensity ratios equal to that expression. And like Star said, we don't know the value or significance of M perhaps a more descriptive name might help with that).