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Simultaneously merge multiple data.frames in a list
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I tested this solution on R2.7.2 and I get the same match.names error. So there's some more fundamental problem with this solution and my data. I used the code: Reduce(function(x, y) merge(x, y, all=T,by.x=match.by, by.y=match....
Detect 7 inch and 10 inch tablet programmatically
...s easy as described above -- use Configuration.smallestScreenWidthDp, then test accordingly:
resources.getConfiguration().smallestScreenWidthDp
Otherwise, if you can afford this, use the following method which is a very accurate approach to detect 600dp (like 6") vs. 720dp (like 10") by letting t...
String concatenation: concat() vs “+” operator
...l produces exactly the same code, but the bytecode compiler cheats. Simple testing entirely fails because the entire body of code is thrown away. Summing System.identityHashCode (not String.hashCode) shows the StringBuffer code has a slight advantage. Subject to change when the next update is releas...
Get ID of last inserted document in a mongoDB w/ Java driver
...tln("doc.id before: " + doc.get("_id")); new Mongo("localhost").getDB("test").getCollection("t").insert(doc); System.out.println("doc.id after: " + doc.get("_id")); </code> this code work well for me, tested on new versions mongo 2.2.2, driver 2.10.1
– zlob
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LLVM vs clang on OS X
...of benchmarks I've seen showed GCC to produce slightly faster code in most test cases (though LLVM had a slight edge in a few), while LLVM and Clang gave significantly better compile times. GCC and the GCC/LLVM combos have the advantage that a lot more code has been tested and works on the GCC flavo...
How do you check what version of SQL Server for a database using TSQL?
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Here's a bit of script I use for testing if a server is 2005 or later
declare @isSqlServer2005 bit
select @isSqlServer2005 = case when CONVERT(int, SUBSTRING(CONVERT(varchar(15), SERVERPROPERTY('productversion')), 0, CHARINDEX('.', CONVERT(varchar(15), SERV...
Returning an array using C
...ved_from(srcArray[i]);
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}
int main(void)
{
char src[] = "This is a test";
char dst[sizeof src];
...
returnArray(src, sizeof src, dst, sizeof dst);
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}
Another method is for the function to allocate the array dynamically and return the pointer and size:
char *returnArray(const ch...
Remove border from IFrame
...ecated and using the "border" CSS attribute is preferred:
<iframe src="test.html" style="width: 100%; height: 400px; border: 0"></iframe>
Note CSS border property does not achieve the desired results in IE6, 7 or 8.
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Where should I put the log4j.properties file?
...as mentioned previously in this thread.
Put log4j-xx.jar under WEB-INF\lib
Test if log4j was loaded: add -Dlog4j.debug @ the end of your java options of tomcat
Hope this will help.
rgds
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i...
How to make the 'cut' command treat same sequental delimiters as one?
... all the possible combinations for future readers. Explanations are at the Test section.
tr | cut
tr -s ' ' < file | cut -d' ' -f4
awk
awk '{print $4}' file
bash
while read -r _ _ _ myfield _
do
echo "forth field: $myfield"
done < file
sed
sed -r 's/^([^ ]*[ ]*){3}([^ ]*).*/\2/' ...