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Thanks Eric-
I ran this in python 2.6, and got this error:
Traceback (most recent call last):
 File "/Users/laura/Desktop/Bohlen10_12_12.py", line 3, in <module>
 import matplotlib.pyplot as plt
ImportError: No module named matplotlib.pyplot
>>> 
So, I am installing matplotlib again.
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On 2012年10月13日 6:41 PM, lulu wrote:
> oh brother -- so now I've got to deal w/ Apple...
I don't see what Apple has to do with it.
> okay thanks.
>
> here's where I am.
>
> I've downloaded matplotlib, numpy, python 2.7.3, xcode and macports to
> simply plot this oh-so-simple code!
> Which is:
>
> Curve fitting with python and pylab
> #import the lib
> from pylab import *
> # assuming this data set
> t = (0,5,10,15,20,25,30,35,40,50)
> V = (1,7,14,15,16,22,25,27,28,30)
> #show the data
> plot(t, v, linewidth=2.0)
> #assume an order
> N = ?
> #find the coefficient of the polynomial
> coeffs = polyfit(t,v,N)
> #get the polynomial output for the input
> best = polyval(coeffs, t)
> #print the coefficients
> print(coeffs)
>
> I have written it like this in python 2.6:
>
> import os,sys
> import numpy
> #import pylab
>
> t = (0,5,10,15,20,25,30,35,40,50)
> V = (1,7,14,15,16,22,25,27,28,30)
> #scipy.plot(t,v,linewidth=2.0)
>
> n = 4
> coeffs = numpy.polyfit(t,V,n)
>
> best = numpy.polyval(coeffs,t)
>
> print coeffs
> print best
>
> and when I run the program, I get this:
> [ -1.68165168e-05 1.71262071e-03 -6.39152514e-02 1.59163337e+00
> 1.04578755e+00]
> [ 1.04578755 7.60964036 12.11505162 15.46811522 18.32267732
> 21.08033633 23.89044289 26.6500999 29.0041625 29.81368631]
>
> when I run in 2.7.3 it looks like this:
> import os,sys
> import numpy as np
> import pylab
>
> t = (0,5,10,15,20,25,30,35,40,50)
> V = (1,7,14,15,16,22,25,27,28,30)
> #scipy.plot(t,v,linewidth=2.0)
>
> n = 4
> coeffs = numpy.polyfit(t,V,n)
>
> best = numpy.polyval(coeffs,t)
>
> print coeffs
> print best
>
>
> And my error msg is this:
> ImportError: No module named numpy
>
> any ideas?
The problem in python 2.7 starts with the fact that numpy is evidently 
not installed for 2.7. Each version of python has its own set of 
libraries, so installing numpy for 2.6 does nothing for 2.7, and vice-versa.
> What I'm looking for is a visual.
With python 2.6, you may be almost there. Try running this in python 2.6:
import numpy as np
import matplotlib.pyplot as plt
t = (0,5,10,15,20,25,30,35,40,50)
V = (1,7,14,15,16,22,25,27,28,30)
plt.plot(t, V, linewidth=2.0)
n = 4
coeffs = np.polyfit(t,V,n)
best = np.polyval(coeffs,t)
print coeffs
print best
plt.show()
Eric

oh brother -- so now I've got to deal w/ Apple...
okay thanks.
here's where I am.
I've downloaded matplotlib, numpy, python 2.7.3, xcode and macports to
simply plot this oh-so-simple code!
Which is:
Curve fitting with python and pylab
#import the lib
from pylab import *
# assuming this data set
t = (0,5,10,15,20,25,30,35,40,50)
V = (1,7,14,15,16,22,25,27,28,30)
#show the data
plot(t, v, linewidth=2.0)
#assume an order
N = ?
#find the coefficient of the polynomial
coeffs = polyfit(t,v,N)
#get the polynomial output for the input
best = polyval(coeffs, t)
#print the coefficients
print(coeffs)
I have written it like this in python 2.6:
import os,sys
import numpy 
#import pylab
t = (0,5,10,15,20,25,30,35,40,50)
V = (1,7,14,15,16,22,25,27,28,30)
#scipy.plot(t,v,linewidth=2.0)
n = 4
coeffs = numpy.polyfit(t,V,n)
best = numpy.polyval(coeffs,t)
print coeffs
print best
and when I run the program, I get this:
[ -1.68165168e-05 1.71262071e-03 -6.39152514e-02 1.59163337e+00
 1.04578755e+00]
[ 1.04578755 7.60964036 12.11505162 15.46811522 18.32267732
 21.08033633 23.89044289 26.6500999 29.0041625 29.81368631]
when I run in 2.7.3 it looks like this:
import os,sys
import numpy as np
import pylab
t = (0,5,10,15,20,25,30,35,40,50)
V = (1,7,14,15,16,22,25,27,28,30)
#scipy.plot(t,v,linewidth=2.0)
n = 4
coeffs = numpy.polyfit(t,V,n)
best = numpy.polyval(coeffs,t)
print coeffs
print best
And my error msg is this:
ImportError: No module named numpy
any ideas?
What I'm looking for is a visual.
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On 2012年10月13日 6:11 PM, lulu wrote:
> okay - thanks...
> so I did THAT - but am prompted for a password.
> I assumed the password would be my administrator, but it isn't.....
> Where would I find that?
Sudo is prompting you for your user password. Depending on how your 
machine was set up, you might not have permission to use sudo. Sudo is 
a mechanism for allowing users to do things that would otherwise require 
the highest level of permissions.
Eric
>
> btw - thank you ALL for all the help!
>
>
>
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okay - thanks...
so I did THAT - but am prompted for a password.
I assumed the password would be my administrator, but it isn't.....
Where would I find that?
btw - thank you ALL for all the help!
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On 2012年10月13日 6:03 PM, lulu wrote:
> Okay --
> I opened terminal, typed 'python' to being, then typed:
There's the problem: don't type "python" to begin, just type the lines 
below directly in the terminal window.
Eric
> sudo port install py26-python
> sudo port install py26-matplotlib
>
> I recieved syntax errors:
>
>>>> sudo port install py26-python
> File "<stdin>", line 1
> sudo port install py26-python
> ^
> SyntaxError: invalid syntax
>>>> sudo port install py26-matplotlib
> File "<stdin>", line 1
> sudo port install py26-matplotlib
>
>
>
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>
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>

Okay --
I opened terminal, typed 'python' to being, then typed:
sudo port install py26-python 
sudo port install py26-matplotlib
I recieved syntax errors:
>>> sudo port install py26-python 
 File "<stdin>", line 1
 sudo port install py26-python 
 ^
SyntaxError: invalid syntax
>>> sudo port install py26-matplotlib
 File "<stdin>", line 1
 sudo port install py26-matplotlib
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No. Not in the python shell. In the regular shell.
On 10/13/12 11:43 PM, lulu wrote:
> okay - that sounds easy enough.
> I am working in the python shell -- just type these lines at the top of my
> code?
>
>
>
> --
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>
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> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

okay - that sounds easy enough.
I am working in the python shell -- just type these lines at the top of my
code?
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in the terminal type:
sudo port install py26-python
sudo port install py26-matplotlib
and there you are!
On Sun, Oct 14, 2012 at 5:37 AM, lulu <lau...@me...> wrote:
> Okay -- that's good to know.
> I've just installed macports, but am not sure how to go about using
> matplotlib in my python 2.6 - or even 2.7 at this point becuase I installed
> that version too.
> I also installed xcode....
>
> geez - this is getting soooo confusing!
>
>
>
> --
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>
> ------------------------------------------------------------------------------
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> Mat...@li...
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Okay -- that's good to know.
I've just installed macports, but am not sure how to go about using
matplotlib in my python 2.6 - or even 2.7 at this point becuase I installed
that version too.
I also installed xcode....
geez - this is getting soooo confusing!
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On Sun, Oct 14, 2012 at 3:42 AM, Paul Tremblay <pau...@gm...> wrote:
> You don't want to install for python 2.6. Python 2.6 is out of date at
> this point.
I disagree. Most of the tools and libraries for 2.6 are available for
2.7 and viceversa (they are quite similar), but not all of them. In
fact, in my experience, I have found more compatibility for 2.6 than
for 2.7.
In most practical scenarios, they will be just the same, but if all
your work has been developed in 2.6 and you are not aware of the
changes introduced by 2.7, it may be unwise to switch uncarefully
(even though the Python deprecation policy is supposed to minimise
this kind of problems).
Lulu, if you just want something that works, you can use macports
(macports.org), and install everything from there. Easy and fail
proof.

I've installed from the http://matplotlib.org site.
I have also looked on other discussions, and am finding that I need to
install Xcode, which I am trying to do now.
the work I have made on python 2.6 - will this be transferrable to 2.7?
Honestly, I am just trying to plot a very simple x/y program.
Thanks
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On 10/13/12 8:55 PM, lulu wrote:
> I have tried to install matplotlib but received an error msg that I need
> python 2.7.
> I installed 2.7, then installed matplotlib for appropriate os, but recieved
> error msg when I ran my program. Then, searching, I am seeing there are
> some that have installed matplotlib for mac osx and python 2.6
>
> Can someone direct me to a useful link to learn more, or does someone have
> info about this, like what I am overlooking or missing?
> thanks,
> lulu
>
>
>
>
Where are you downloading the installation from? It sounds like the 
problem lies with the installation.
You don't want to install for python 2.6. Python 2.6 is out of date at 
this point.
If you have xcode tools installed, you could install from source, but 
that requires a bit more work.
Paul

I have tried to install matplotlib but received an error msg that I need
python 2.7.
I installed 2.7, then installed matplotlib for appropriate os, but recieved
error msg when I ran my program. Then, searching, I am seeing there are
some that have installed matplotlib for mac osx and python 2.6
Can someone direct me to a useful link to learn more, or does someone have
info about this, like what I am overlooking or missing?
thanks,
lulu
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