Colin Ross wrote: > On Wed, Jun 29, 2016 at 2:41 PM, Peter Otten <__pete...@web.de> wrote: > >> Colin Ross wrote: >> >> > Good afternoon, >> > >> > I have a .dat file that is 214 rows by 65 columns that I would like to >> > read into python and plot the 1st column versus all other columns. >> > >> > My code: >> > >> > ######################################################################### >> > >> > import numpy as np >> > import scipy >> > import pylab as pl >> > import matplotlib >> > from matplotlib.ticker import ScalarFormatter, FormatStrFormatter >> > import sys >> > >> > # Load in text from .dat file >> > >> > sed = np.loadtxt('spectra.dat', unpack = True) >> >> for flux in sed: >> pl.plot(wavelength, flux) >> >> > pl.xscale('log') >> > >> > pl.show() >> > >> > ######################################################################### >> > >> > This is fine if I want to write out a separate line for each of the 65 >> > columns, but I would like to simplify the code by looping over the >> > data. Can someone please help me formatting the loop correctly? >> > > Thank you for the fast response! I have tried this and it outputs the > attached image.
This is a text-only mailing list, so the image didn't make it through. > It seems to only plot 1 curve, when I would have expected > 64? You probably got a traceback (error information on the commandline). It is always a good idea to include that. Example: $ python3 flux2.py Traceback (most recent call last): File "flux2.py", line 15, in <module> pl.plot(wavelength,flux) NameError: name 'wavelength' is not defined The error indicates that there is no variable called wavelength. That's because I didn't note that you use the first column to define that, sorry. Here's a modified script that should work: import numpy as np import pylab as pl sed = np.loadtxt('spectra.dat', unpack=True) wavelength = sed[0] for flux in sed[1:]: pl.plot(wavelength, flux) pl.xscale('log') pl.show() The for loop now skips the first column. _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor