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Why can't I use background image and color together?
...u use the composite style background to set both separately, only the last one will be used, that's one possible reason why your color is not visible:
background: green; /* will be ignored */
background: url(images/shadow.gif) right no-repeat;
There is no way to specifically limit the background ...
MVVM: Tutorial from start to finish?
...son Dolinger's awesome video. Although I have found many, I have not found one that takes me from start to finish. What I really want is a tutorial that doesn't assume any previous WPF knowledge.
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How does a PreparedStatement avoid or prevent SQL injection?
... No, in the FIRST instance, you'd get that statement. In the second one, it would insert "Robert'); DROP TABLE students;--" into the user table.
– Paul Tomblin
Oct 17 '09 at 13:38
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Trying to fix line-endings with git filter-branch, but having no luck
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The easiest way to fix this is to make one commit that fixes all the line endings. Assuming that you don't have any modified files, then you can do this as follows.
# From the root of your repository remove everything from the index
git rm --cached -r .
# Change...
What reason is there to use null instead of undefined in JavaScript?
...s in the conventions of how you use them in your system. As some have mentioned, some people use null for meaning "no object" where you might sometimes get an object while undefined means that no object was expected (or that there was an error). My problem with that is its completely arbitrary, and ...
How to check if a float value is a whole number
...ything over 3 cubed, (including 10648) was missed out due to the aforementioned imprecision:
>>> (4**3) ** (1.0/3)
3.9999999999999996
>>> 10648 ** (1.0/3)
21.999999999999996
You'd have to check for numbers close to the whole number instead, or not use float() to find your number...
Add a common Legend for combined ggplots
...legend(p1)
p3 <- grid.arrange(arrangeGrob(p1 + theme(legend.position="none"),
p2 + theme(legend.position="none"),
nrow=1),
mylegend, nrow=2,heights=c(10, 1))
Here is the resulting plot:
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Numpy: Get random set of rows from 2D array
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This is a similar answer to the one Hezi Rasheff provided, but simplified so newer python users understand what's going on (I noticed many new datascience students fetch random samples in the weirdest ways because they don't know what they are doing in pyth...
When to use Comparable and Comparator
...ment Comparable if that is the clear natural way to sort the class, and anyone would need to sort the class would generally want to do it that way.
If, however, the sorting was an unusual use of the class, or the sorting only makes sense for a specific use case, then a Comparator is a better option...
Convert string date to timestamp in Python
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it assumes midnight 01/12/2011 in local timezone. If input is in UTC; you could use calendar.timegm() or .toordinal()
– jfs
Nov 17 '13 at 19:56
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