Changing one list unexpectedly changes another, too
Why does v change at all?
python
IPython Notebook locale error
After installing the latest Mac OSX 64-bit Anaconda Python distribution, I keep getting a ValueError when trying to start the IPython Notebook. Starting ipython works fine: 3-millerc-~:ipython Python 2.7.3 |Anaconda 1.4.0 (x86_64)| (default, Feb 25 2013, 18:45:56) Type "copyright", "credits" or "license" for more information. IPython 0.13.1 — An enhanced Interactive Python. ? -> Introduction … Read more
ValueError: setting an array element with a sequence
This Python code:
How can I check for NaN values?
float('nan') represents NaN (not a number). But how do I check for it?
Pretty-print an entire Pandas Series / DataFrame
I work with Series and DataFrames on the terminal a lot. The default __repr__ for a Series returns a reduced sample, with some head and tail values, but the rest missing.
How to update a plot in matplotlib
I’m having issues with redrawing the figure here. I allow the user to specify the units in the time scale (x-axis) and then I recalculate and call this function plots(). I want the plot to simply update, not append another plot to the figure.
How to replace NaN values by Zeroes in a column of a Pandas Dataframe?
I have a Pandas Dataframe as below:
Difference between numpy.array shape (R, 1) and (R,)
In numpy, some of the operations return in shape (R, 1) but some return (R,). This will make matrix multiplication more tedious since explicit reshape is required. For example, given a matrix M, if we want to do numpy.dot(M[:,0], numpy.ones((1, R))) where R is the number of rows (of course, the same issue also occurs column-wise). We will get matrices are not aligned error since M[:,0] is in shape (R,) but numpy.ones((1, R)) is in shape (1, R).