Merging numpy array elements using join() in python

Question

Want to convert the following numpy array a

    a =  [
    array([['x', 'y', 'k'], ['d', '2', 'z'], ['a', '15', 'r']], dtype='|S2'), 
    array([['p', '49'], ['l', 'n']], dtype='|S2'), 
    array([['5', 'y'], ['33', 'u'], ['v', 'z']], dtype='|S2'), 
    array([['f', 'i'], ['c', 'm'], ['u', '98']] dtype='|S2')
    ]

into output b

  b =  x!y.d!2.a!15 * x!k.d!z.a!r , p!49.l!n , 5!y.33!u.v!z , f!i.c!m.u!98

Consider each sub-array like this

   #x  #y  #k
   #d  #2  #z
   #a  #15 #r

Then merge 0 and 1 columns with '!' and each row with '.' Then merge 0 and 2 column. And so on. Here 0,1 and 0,2 columns are merged using '*' And ',' is used to merge the sub-arrays

Just merging the strings using '!' '.' '*' ','

I tried the following code. Couldnt get the result though

temp = []
for c in a:
    temp = a[0:]
    b =  " * ".join(".".join(var1+"!"+var2 for var1,var2 in zip(temp,a) for row in a)
    print b
print " , "

namit · Accepted Answer · 2015-11-24 06:49:48Z

4

In [144]: " , ".join(" * ".join(".".join(str(xx) + '!' + str(yy) for xx, yy in zip(x[:, 0], x[:, _x])) for _x in range(1, len(x[0]))) for x in a)
Out[144]: 'x!y.d!2.a!15 * x!k.d!z.a!r , p!49.l!n , 5!y.33!u.v!z , f!i.c!m.u!98'

answered Nov 24, 2015 at 6:49

namit

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Comments

Abylay · Accepted Answer · 2015-11-24 06:08:34Z

4

How I understand, your solution maybe like this:

import numpy as np
a =  [
  np.array([['x', 'y', 'k'], ['d', '2', 'z'], ['a', '15', 'r']], dtype='|S2'),
  np.array([['p', '49'], ['l', 'n']], dtype='|S2'),
  np.array([['5', 'y'], ['33', 'u'], ['v', 'z']], dtype='|S2'),
  np.array([['f', 'i'], ['c', 'm'], ['u', '98']], dtype='|S2')
  ]

aa = []
for k in a:
  bb = []
  for i in range(len(k[0]) - 1):
    cc = []
    for j in range(len(k)):
      cc.append('!'.join([k[j][0], k[j][i + 1]]))
    bb.append('.'.join(cc))
  aa.append(' * '.join(bb))
b = ' , '.join(aa)

print b

If it's wrong, please, clarify your algorithm.

edited Nov 24, 2015 at 6:08

answered Nov 24, 2015 at 5:52

Abylay

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3 Comments

Abylay Over a year ago

@Chloe, please, give more examples, to understand better

Chloe Over a year ago

I modified it @Abylay

Chloe Over a year ago

I think i am a bit confused of your indentations @Abylay

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