I'm running Python 2.7.11 from the Anaconda distribution (version 2.4.1) on a MacBook Pro running Mac OS X version 10.11.2 (El Capitan) I'm attempting to use numpy.ma.polyfit to perform a linear least square fit on some data I have. I'm running NumPy version 1.10.1. I've observed that in executing either numpy.polyfit or numpy.ma.polyfit I get the following traceback: /Users/user/anaconda/lib/python2.7/site-packages/numpy/lib/polynomial.py:594: RankWarning: Polyfit may be poorly conditioned warnings.warn(msg, RankWarning) Traceback (most recent call last): File "ComputeEnergy.py", line 132, in <module> coeffs, covar = np.ma.polyfit( xfit, yfit, fit_degree, rcond=rcondv, cov=True ) File "/Users/user/anaconda/lib/python2.7/site-packages/numpy/ma/extras.py", line 1951, in polyfit return np.polyfit(x, y, deg, rcond, full, w, cov) File "/Users/user/anaconda/lib/python2.7/site-packages/numpy/lib/polynomial.py", line 607, in polyfit return c, Vbase * fac ValueError: operands could not be broadcast together with shapes (6,6) (0,) I've attached a stripped down version of the Python program I'm running. Any suggestions? Sam Dupree.
On 2015/12/14 6:39 PM, Samuel Dupree wrote:
I'm running Python 2.7.11 from the Anaconda distribution (version 2.4.1) on a MacBook Pro running Mac OS X version 10.11.2 (El Capitan)
I'm attempting to use numpy.ma.polyfit to perform a linear least square fit on some data I have. I'm running NumPy version 1.10.1. I've observed that in executing either numpy.polyfit or numpy.ma.polyfit I get the following traceback:
/Users/user/anaconda/lib/python2.7/site-packages/numpy/lib/polynomial.py:594: RankWarning: Polyfit may be poorly conditioned warnings.warn(msg, RankWarning) Traceback (most recent call last): File "ComputeEnergy.py", line 132, in <module> coeffs, covar = np.ma.polyfit( xfit, yfit, fit_degree, rcond=rcondv, cov=True ) File "/Users/user/anaconda/lib/python2.7/site-packages/numpy/ma/extras.py", line 1951, in polyfit return np.polyfit(x, y, deg, rcond, full, w, cov) File "/Users/user/anaconda/lib/python2.7/site-packages/numpy/lib/polynomial.py", line 607, in polyfit return c, Vbase * fac ValueError: operands could not be broadcast together with shapes (6,6) (0,)
I've attached a stripped down version of the Python program I'm running.
Sam, That is not stripped down very far; it's still not something someone on the list can run.
Any suggestions?
Use debugging techniques to figure out what is going on inside your script. In particular, what are the arguments that polyfit is choking on? I would run the script in ipython and use the %debug magic to drop into the debugger when it fails. Then use "up" to move up the stack until you get to the line calling polyfit, and then use the print function to print each of the arguments. Chances are, either they will not be what you expect them to be, or they will, but you will find a logical inconsistency among them. It looks like you are using Spyder, presumably with the ipython console, so run your script, then when it fails type "%debug" in the ipython console window and you will be dropped into the standard pdb debugger. Eric
Sam Dupree.
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