Introduction

I decided to survive with minecraft. So what should we do to survive? What items should I create?

This is a story of trying to know the relationship and importance of each item using an algorithm called the extended network method.

I am running it with jupyter notebook. In addition, visualization is performed with Cytoscape.

Extended network method

It is explained in the figure below.

Find out which items are currently craftable and add them to the existing items. Repeat this until it converges.

Internally, it is handled by the following matrix.

・ Matrix R representing the left side of the recipe

	A	B	C	D	E	F
Recipe 1	1	1	0	0	0	0
Recipe 2	0	1	1	0	0	0
...

-Vector B representing the number of elements on the left side of the recipe

	number
Recipe 1	2
Recipe 2	2
...

・ Matrix P representing the right side of the recipe

	A	B	C	D	E	F
Recipe 1	0	0	0	1	0	0
Recipe 2	0	0	0	0	1	0
...

-Matrix x representing existing items

	A	B	C	D	E	F	...
Does it exist?	1	1	0	0	0	0

The procedure is

Take the inner product of R and x and see if it matches B In other words, make sure you have all the items you need to craft.
If they match, add the P corresponding to R to x as the recipe was crafted. Add the crafted item to x.

Repeat this until it converges.

Recipe database creation

Create a database of minecraft recipes ("all recipes" in the above explanation). I quoted the recipe from minecraft wiki. I will summarize it in a csv file.

The reason why it is enclosed in "" is that it is convenient for the process of extracting a character string.

Run

I will introduce the flow with screenshots. The main program is an implementation of the above extended network method.

import

Item dictionary creation

Create a dictionary of items based on the imported recipe.

Specify the initial item

What do you get first when you get off in survival mode? So, this time, I chose wood (log), cobblestone, and iron ingot, which will be available relatively early (although it may not be so easy to obtain iron ingot). ...).

Execution result

As mentioned above, a total of 62 items have been crafted.

Visualization

Let's visualize it with Cytoscape.

Nodes with many edges extending are important items.

This time I added a diamond to the initial item.

Conclusion

Stick, important.

Thank you for visiting.

References

https://www.cell.com/fulltext/S0092-8674(17)30133-2 It describes the extended network method.

[PYTHON] [Minecraft] What are the important items in survival?