numpy array summary with for loop

Question

I have a lot of txt, I want to read it, and plus them(every txt have same shape of array)

    for i in base_n:
        dfp_base=np.loadtxt(base_n,skiprows=2,usecols=(1,2,3))
        dfp_base+=dfp_base
    print dfp_base

but it's will only plus the end of files

I try to assign a variable but it's will give me an error

    for i in base_n:
        dfp_base=np.loadtxt(base_n,skiprows=2,usecols=(1,2,3))
        dfp_base_s+=dfp_base
    print dfp_base_s

UnboundLocalError: local variable 'dfp_base_s' referenced before assignment

how to fix it?

EDIT i define a zero array and solve this problem

dfp_base_s=np.zeros(shape=(30,3))

Did you forget to initialize dfp_base_s ?

Zabir Al Nazi Nabil
– Zabir Al Nazi Nabil

2020-05-07 05:37:43 +00:00
Commented May 7, 2020 at 5:37 — Zabir Al Nazi Nabil
– Zabir Al Nazi Nabil, Commented May 7, 2020 at 5:37
the anwser is right! I need to define dfp_base_sat first

blueman010112
– blueman010112

2020-05-07 06:30:18 +00:00
Commented May 7, 2020 at 6:30 — blueman010112
– blueman010112, Commented May 7, 2020 at 6:30

Beny Gj · Accepted Answer · 2020-05-07 05:38:53Z

2

your problem that you are trying to assign to var that not referenced before assignment see on below:

for i in range(1,10): 
     dfp_base=1 
     dfp_base_s+=dfp_base 



NameError                                 Traceback (most recent call last)
<ipython-input-2-24596062a447> in <module>
      1 for i in range(1,10):
      2      dfp_base=1
----> 3      dfp_base_s+=dfp_base
      4 

NameError: name 'dfp_base_s' is not defined

but if you initialize before the loop that will work

 dfp_base_s = 0              

 for i in range(1,10): 
      dfp_base=1 
      dfp_base_s+=dfp_base 


 dfp_base_s                  
 9

answered May 7, 2020 at 5:38

Beny Gj

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