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Controlling a system is essential whenever it needs to full fill a relevant task as such. It's depending on the designer of the product. PID is one of the most common and perfect systems in control systems. PID gives us a rough idea about what it stands for. P for proportional, I for integral and D for derivative as such. Let me explain the idea of what I've absorbed from working with those basic things. What I wanted to build is a line following a smart car that used two proximity sensors to identify the white line on a black surface. I was trying with several controlling methods implemented on my own, They worked properly as well but my robot was too slow. After that I got to search for a controlling method via the internet it was found the PID controlling system for me. PID is a close loop feedback system which was full filled my requirements with a nice speedy robot. I thought that it would be better to share with what I've grabbed from them with you as well....

How about a little programming session today? Develop a program to read in 2 matrices A and B with dimensions (l X m) and (m X n) respectively, and compute and display their product AB(of dimensions (l X n)). Assume that the elements of matrices are integers. An example is shown below.(l,m,n belongs to positive integers) Matrix A: 1 2 5 2 1 6 Matrix B: 3 4 6 4 5 6 1 2 7 8 9 9 Matrix AB: 48 56 53 53  53 62 67 64 We recommend you to tryout the question before you check the answer. Here is a Python code for above question. r1,c1=input("input first matrix rows and columns:").split(" ") m1=[] for p in range(0,int(r1)):     m1.append(list(map(int,input().split(" ")))) r2,c2=input("input second matrix rows and columns:").split(" ") m2=[] for q in range(0,int(r2)):               m2.append(list(map(int,input().split(" ")))) if c1!=r2:     print("invalid input") else:     m3=[]     t=0 ...

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