Need help fixing Index Error

[deanhystad]

This returns the same error.

import numpy as np
x = np.array((1, 2, 3))
y = x[1]
z = y[1]

Error:
  File "test.py", line 4, in <module>
    z = y[1]
IndexError: invalid index to scalar variable.

This indicates that something that is not indexable is being indexed. In particular it means a numpy scalar is being indexed because you get a different error message if you index an int or a float.

But I don't see where this is happening in your code. I did this as a quick check.

import numpy as np

iteration = 40
Ltotal = np.linspace(1,20000,iteration) #m
m = np.linspace(1,40,iteration) #number of passes
ktube = np.array([400,48,160,16]) #copper,mild steel, aluminum, stainless steel
Cptube = np.array([376.8,510.8,921.1,460.5])
ptube = np.array([894,785,270,800] )
tfin = np.linspace(0.1/1000,1/1000,iteration) #m
tspace = np.linspace(1/1000,1/100,iteration) #m
ODtube = np.linspace(0.0001,1,iteration) #m
unitcost = np.array([7.50,0.34,1.87,1.98]) #$/kg

i = 0
j = 0
print(Ltotal[i],m[i],ktube[j],Cptube[j],ptube[j],tfin[i],tspace[i],ODtube[i],unitcost[j])

That ran with no problems, leaving this:

values(Ltotal[i],m[i],ktube[j],Cptube[j],ptube[j],tfin[i],tspace[i],ODtube[i],unitcost[j])

What is values()?