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Is gcc std::unordered_map implementation slow? If so - why?
... found the reason: it is a Problem of gcc-4.7!!
With gcc-4.7
inserts: 37728
get : 2985
With gcc-4.6
inserts: 2531
get : 1565
So std::unordered_map in gcc-4.7 is broken (or my installation, which is an installation of gcc-4.7.0 on Ubuntu - and another installation which is gcc 4.7.1 on d...
pandas read_csv and filter columns with usecols
...pandas as pd
from StringIO import StringIO
csv = r"""dummy,date,loc,x
bar,20090101,a,1
bar,20090102,a,3
bar,20090103,a,5
bar,20090101,b,1
bar,20090102,b,3
bar,20090103,b,5"""
df = pd.read_csv(StringIO(csv),
header=0,
index_col=["date", "loc"],
usecols=["date", "loc", "x"],...
What is the maximum characters for the NVARCHAR(MAX)?
I have declared a column of type NVARCHAR(MAX) in SQL Server 2008, what would be its exact maximum characters having the MAX as the length?
...
How can I pass a constant value for 1 binding in multi-binding?
...uld work:
<TextBlock>
<TextBlock.Resources>
<sys:Int32 x:Key="fixedValue">123</sys:Int32>
</TextBlock.Resources>
<TextBlock.Text>
<MultiBinding Converter="{StaticResource myConverter}">
<Binding Path="myFirst.Value" />
<Bi...
Automatically plot different colored lines
... a colormap such as HSV to generate a set of colors. For example:
cc=hsv(12);
figure;
hold on;
for i=1:12
plot([0 1],[0 i],'color',cc(i,:));
end
MATLAB has 13 different named colormaps ('doc colormap' lists them all).
Another option for plotting lines in different colors is to use the Line...
Checking images for similarity with OpenCV
...
211
This is a huge topic, with answers from 3 lines of code to entire research magazines.
I will o...
How to change the default font size in ggplot2
...like to know if it is possible to change some default parameters of ggplot2 graphics, like font size for instance, for a whole R session. The idea is to avoid setting them for each plot.
...
github markdown colspan
... <td>Two</td>
</tr>
<tr>
<td colspan="2">Three</td>
</tr>
</table>
Becomes
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Android Studio could not find any version that matches com.android.support:appcompat-v7:+
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edited Aug 2 '14 at 4:21
Halil
1,3311616 silver badges3333 bronze badges
answered Dec 29 ...
C# equivalent to Java's charAt()?
...
201
You can index into a string in C# like an array, and you get the character at that index.
Exa...