'numpy.ndarray' object is not callable in the Ipython console

Question

I am trying to calculate cpmx, hmx, smpx, tmpx and smvx by doing simple interpolation after loading the data from excel into pandas dataframe.

While calling the function with cpmx=absmatdata(1,0,0,0,44.011,100) I see:

'numpy.ndarray' object is not callable

Any idea how to go about this?

Here is my code:

import numpy as np
import pandas as pd

def absmatdata(a,b,c,d,material,tmp_ref):
    material_map = {2.016: 'H2', 28.016: 'N2', 32.000: 'O2', 32.065: 'S',
                18.016: 'H2O', 64.065: 'SO2', 12.001: 'C Graphite', 
                28.011: 'CO', 44.011: 'CO2', 16.043: 'CH4', 30.070: 'C2H6',
                44.097: 'C3H8', 58.124: 'C4H10'}
    if material in material_map:
        df = pd.read_excel('F:\MAschinenbau\Bachelorarbeit\ABSMAT.xlsx',sheet_name=material_map[material])        
    else:
        print('No data for this material available')    
        df = [list(np.arange(0,1100,100)),list(np.arange(0,11,1)),list(np.arange(0,11,1)),list(np.arange(0,11,1)),list(np.arange(0,11,1))]
    tmp = df.values[:,0]
    cpm = df.values[:,1]
    hm = df.values[:,2]
    smp = df.values[:,3]
    smv = df.values[:,4]
    tn = np.size(df)
    tmp0 = tmp_ref
    tmpx = a
    cpmx = 0
    hmx = b
    smpx = c
    smvx = d
    if a==0 and b==0 and c==0 and d==0:
        print('All values are zero')
    elif a!=0 and b==0 and c==0 and d==0:
        print('T interpolation')
        for i in range(0,tn-1):
            if tmpx > tmp(i) and tmpx <= tmp(i+1):
                int_fak = (tmpx-tmp(i))/(tmp(i+1)-tmp(i))
                cpmx = cpm(i) + int_fak*(cpm(i+1)-cpm(i))
                hmx = hm(i) + int_fak*(hm(i+1)-hm(i))
                smpx = smp(i) + int_fak*(smp(i+1)-smp(i))
                smvx = smv(i) + int_fak*(smv(i+1)-smv(i))
    return tmpx, cpmx, hmx, smpx, smvx

Which line rise the error? Can you provide F:\MAschinenbau\Bachelorarbeit\ABSMAT.xlsx ? Or atleast error message? — İhsan Cemil Çiçek
– İhsan Cemil Çiçek, Commented Nov 6, 2018 at 10:13
The error message is correctly describing the problem. You write expressions like tmp(i) which makes python believe you want to call a function tmp (which is a numpy array) with argument i. Since numpy arrays are not supposed to be called as a function the error occures. You have to use square brackets for indexing []. this is Python, not MATLAB — gehbiszumeis
– gehbiszumeis, Commented Nov 6, 2018 at 10:16

İhsan Cemil Çiçek · Accepted Answer · 2018-11-06 10:58:15Z

1

You set df to DataFrame
You set tmp = df.values[:,0]
You have numpy.ndarry at tmp
You have to get its items with [] not with ()

Your loop part

 if tmpx > tmp(i) and tmpx <= tmp(i+1):
                 int_fak = (tmpx-tmp(i))/(tmp(i+1)-tmp(i))
                 cpmx = cpm(i) + int_fak*(cpm(i+1)-cpm(i))
                 hmx = hm(i) + int_fak*(hm(i+1)-hm(i))
                 smpx = smp(i) + int_fak*(smp(i+1)-smp(i))
                 smvx = smv(i) + int_fak*(smv(i+1)-smv(i))

Should change with

if tmpx > tmp[i] and tmpx <= tmp[i+1]:
                int_fak = (tmpx-tmp[i])/(tmp[i+1]-tmp[i])
                cpmx = cpm[i] + int_fak*(cpm[i+1]-cpm[i])
                hmx = hm[i] + int_fak*(hm[i+1]-hm(i))
                smpx = smp[i] + int_fak*(smp[i+1]-smp[i])
                smvx = smv[i] + int_fak*(smv[i+1]-smv[i])

Also you need to change your tn to

tn = np.size(df.values[:,0])

edited Nov 6, 2018 at 10:58

answered Nov 6, 2018 at 10:24

İhsan Cemil Çiçek

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7 Comments

Tudee92 Over a year ago

Thank you @Ihsan Cemil Cicek, I changes the round brackets to square brackets.The error has now gone. But now I have a new error "index 38 is out of bounds for axis 0 with size 38" in the line "if tmpx > tmp[i] and tmpx <= tmp[i+1]:". Does it has anything to do with number of rows ? the excel file has 38 rows and 5 columns, it is an 38x5 array

İhsan Cemil Çiçek Over a year ago

index 38 is [37] actually you should start with [0] index.

Tudee92 Over a year ago

which line you mean [0] ?

İhsan Cemil Çiçek Over a year ago

I could not able to find solution can you provide excel file?

İhsan Cemil Çiçek Over a year ago

Dropbox, Drive or something like that.

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