I can’t figure out how to store the result from cell magic – %%timeit
? I’ve read:
- Can you capture the output of ipython’s magic methods?
- Capture the result of an IPython magic function
and in this questions answers only about line magic. In line mode (%
) this works:
In[1]: res = %timeit -o np.linalg.inv(A)
But in cell mode (%%
) it does not:
In[2]: res = %%timeit -o A = np.mat('1 2 3; 7 4 9; 5 6 1') np.linalg.inv(A)
It simply executes the cell, no magic. Is it a bug or I’m doing something wrong?
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Answer
You can use the _
variable (stores the last result) after the %%timeit -o
cell and assign it to some reusable variable:
In[2]: %%timeit -o A = np.mat('1 2 3; 7 4 9; 5 6 1') np.linalg.inv(A) Out[2]: blabla <TimeitResult : 1 loop, best of 3: 588 µs per loop> In[3]: res = _ In[4]: res Out[4]: <TimeitResult : 1 loop, best of 3: 588 µs per loop>
I don’t think it’s a bug because cell mode commands must be the first command in that cell so you can’t put anything (not even res = ...
) in front of that command.
However you still need the -o
because otherwise the _
variable contains None
.