Binary matrix multiplication python
Know how to create arrays: Know the shape of the array with array. Adjust the shape of the array using reshape or flatten it with ravel. Know miscellaneous operations on arrays, such as finding the mean or max array. No need to retain everything, but have the reflex to search in the documentation online docs, help , lookfor!!
Know more NumPy functions to handle various array operations. If you want to do a first quick pass through the Scipy lectures to learn the ecosystem, you can directly skip to the next chapter: The remainder of this chapter is not necessary to follow the rest of the intro part. But be sure to come back and finish this chapter, as well as to do some more exercices.
Edit it on Github. Warning Array multiplication is not matrix multiplication: Elementwise operations Try simple arithmetic elementwise operations: Warning The transposition is a view As a results, the following code is wrong and will not make a matrix symmetric: Note Linear algebra The sub-module numpy.
Exercise other operations Look at the help for np. When might this be useful? It's a practical book on mathematics and consists of problems. Useful problems for solving everyday problems of engineering, surveying, trade, and taxation. This book had played a similar role for mathematics in China than Euclid's Elements in the "European" mathematics. Chapter 8 of this book deals with "Calculation by Square Tables", solving systems of simultaneous linear equations.
Another Quote In my daily work, I work on very large, complex, distributed systems built out of many Python modules and packages. The focus is very similar to what you find, for example, in Java and, in general, in systems programming languages. Boolean Masking of Arrays Next Chapter: I am quite sure this will outperform almost every other change. The third post will be about parallel programming. I have two cores and I want to see if it will be significantly faster if I use both of them.
I will post all scripts for this test and I've added a GIT repository , so feel free to test it on your machine. If you know how, please leave a comment. If you know other languages, you could create a script for these. I have implemented these three types of algorithms for this post: This is a simple, straight forward implementation of a matrix multiplication. I've used the definition of matrix multiplication. I didn't use multiple threads.
I always prefer libraries over self-implemented solutions. I think they are faster than anything I could come up with in a reasonable amount of time. If you post a solution, please consider these restrictions: The input file should get passed with the parameter -i , e.
The two square-matrices that should get multiplied are Every line of one matrix is one line in the text-file. The both matrices are separated by one newline. The result has to get printed to standard output. I make the diff to test if the result is correct. The file that was created needs about