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How do I make a matrix from a list of vectors in R?
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124
One option is to use do.call():
> do.call(rbind, a)
[,1] [,2] [,3] [,4] [,5] [,6]
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What is the equivalent of MATLAB's repmat in NumPy
...gives a 3d output array as you would expect - matlab for some reason gives 2d output - but the content is the same).
Matlab:
>> repmat([1;1],[1,1,1])
ans =
1
1
Python:
In [46]: a = np.array([[1],[1]])
In [47]: np.tile(a, [1,1,1])
Out[47]:
array([[[1],
[1]]])
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Is there a way to detect if an image is blurry?
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12 Answers
12
Active
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Are 2^n and n*2^n in the same time complexity?
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232
You will have to go to the formal definition of the big O (O) in order to answer this question...
Why does 2 mod 4 = 2?
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152
Mod just means you take the remainder after performing the division. Since 4 goes into 2 zero ti...
Dynamically update values of a chartjs chart
... on a line chart: http://jsbin.com/yitep/4/edit
Original Post
As of Nov 2013, there seem to be very few options for updating charts.
There is a good example here (duplicated below) of adding new points to a line chart. Still kind of jumpy but not too bad. However, I think the effect probably...
Applying a function to every row of a table using dplyr?
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202
As of dplyr 0.2 (I think) rowwise() is implemented, so the answer to this problem becomes:
ir...
Ruby Bundle Symbol not found: _SSLv2_client_method (LoadError)
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287
I just fixed a similar issue on my system. You need to rebuild your install of Ruby 2.1.2 and ...
How to convert float to int with Java
...ted May 7 '15 at 18:03
user719662
answered Aug 18 '09 at 17:41
tw39124tw39124
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