[Tutor] unsupported operand

[stm atoc]

Hi there,

I would like to define concentration array based on time and then plot it.
Here is the profile:

from pylab import *
import numpy
import array
import math
tmax=1*3600
t      = 1.
outfile=open('ourtest_out.list','w')
N = 100
Conc1 = arange([0, tmax])
outfile.close()

lw = 2.0 #linewidth
dpi = 96
figure(figsize=(12,6),dpi=dpi)
pyplot.plot(Conc1, t,'r-',label='Conc' )
savefig('Conc.png')
show()

and this is the error that I got:

TypeError: unsupported operand type(s) for -: 'list' and 'int'

What would you suggest?
Thank you,
Sue