I want to create a code in python or Matlab to divide a sequence into pairs and give the values to t-CodePudding

I want to create a program in python or Matlab to divide a sequence into pairs such that first letter pairs with all other letters and give the values to these pairs. Example "ABCBADD" AB=1 AC=1/2 AB=1/3 AA=1/4 AD=1/5 AD=1/6 Now skip first letter of sequence "BCBADD" BC=1 BB=1/2 BA=1/3 BD=1/4 BD=1/5 Now skip first and so on "CBADD" and add same pair values as AB=1 1/3,AD=1/5 1/6,BD=1/4 1/5 I will be thankful to help me

CodePudding user response：

you could do with two loop:

s = "ABCBADD"   
output = [(s[i]   c, 1 /(idx   1))   for i in range(len(s) -1) for idx, c in enumerate(s[i 1:])]

output:

print(output)

[('AB', 1.0),
 ('AC', 0.5),
 ('AB', 0.3333333333333333),
 ('AA', 0.25),
 ('AD', 0.2),
 ('AD', 0.16666666666666666),
 ('BC', 1.0),
 ('BB', 0.5),
 ('BA', 0.3333333333333333),
 ('BD', 0.25),
 ('BD', 0.2),
 ('CB', 1.0),
 ('CA', 0.5),
 ('CD', 0.3333333333333333),
 ('CD', 0.25),
 ('BA', 1.0),
 ('BD', 0.5),
 ('BD', 0.3333333333333333),
 ('AD', 1.0),
 ('AD', 0.5),
 ('DD', 1.0)]