The method must be of pretty high quality if it can be used for a variety of matrices.
Matrices were used to organize data.
In chemistry, the spike method, more often called the addition method, is used to find the concentration of an analyte in a complex matrix. Examples of such matrices would be soil samples or biological fluids.
7
Let me correct you: two-dimensional arrays are used in programming to represent matrices. (Matrices are objects of mathematics, arrays are objects of programming.)
I suggest asking separate questions for complex numbers, and for matrices. Complex numbers are used in a variety of fields, one of them is electrical engineering. As soon as AC circuits are analyzed, it turns out that complex numbers are the natural way to do this.
The design method is used in a variety of fields. The common thread is the steps used in the method. It includes situation, research, ideaton, development and realisation.
A prime example of matrices (plural) being used in computers if in computer graphics and rendering where matrices are used in 3D work for transformations like rotation, scaling and translations. Although I'm sure there are plenty more fields in computer science where matrices may be used.
Matrices are used to figure who is seeded in a contest like the NCAA basketball final four. Matrices are used in any calculation that has to do with multiple variables. In business the maximum that you charge for a ticket and make the most money, I have used matrices.
Unless your "everyday life" involves work in some area of engineering, you won't use matrices in your everyday life.
The FIFO (First In First Out) is used to keep products or ingredients from expiring or losing quality. If the FILO (First In Last Out) method were used there would be a chance of degrading quality or expiring products or ingredients.
fat mum
Matrices are used in pretty much any situation where several linear equations are involved. They're used all over the place in physics, chemistry, engineering, and economics. I linked a site below with more information.