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ggplot2 keep unused levels barplot
...1$type <- factor(df1$type, levels=c("A","B", "C"))
df <- data.frame(table(df))
df1 <- data.frame(table(df1))
df$plot = "A"
df1$plot = "B"
df <- rbind(df, df1)
ggplot(df, aes(x=group, y=Freq, fill=type)) + geom_bar(position="dodge", stat="identity") + facet_wrap( ~ plot, scales="free"...
Why does parseInt(1/0, 19) return 18?
...es as if you called parseInt("I", 19), which converts to decimal 18 by the table above.
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Difference between Hashing a Password and Encrypting it
...rrence of collisions. You can attack a secure hash by the use of a rainbow table, which you can counteract by applying a salt to the hash before storing it.
Encrypting is a proper (two way) function. It's reversible, you can decrypt the mangled string to get original string if you have the key.
Th...
Static extension methods [duplicate]
....Parse(..)
vs.
Helper.ParseBool(..);
Doesn't really bring much to the table...
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dynamically add and remove view to viewpager
...ate static final int DATABASE_VERSION = 1;
private static final String TABLE_NAME = "diary";
private static final String TITLE = "id";
private static final String BODY = "content";
DBHelper dbHelper = new DBHelper(this);
ArrayList<String> frags = new ArrayList<String>...
Insert text with single quotes in PostgreSQL
I have a table test(id,name) .
7 Answers
7
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How to convert timestamp to datetime in MySQL?
...
You can use
select from_unixtime(1300464000,"%Y-%m-%d %h %i %s") from table;
For in details description about
from_unixtime()
unix_timestamp()
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Single Sign On across multiple domains [closed]
...ou can bang out a cookie-based solution. Think GUID and a database session table.
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View HTTP headers in Google Chrome?
...ick on the network tab you see an overview at first on the right side in a table format with a timeline graph. If you click on an individual file from the list at the left you will then see the tabs shown in the picture above (including the Headers tab). This is what @Tower meant by "click on them...
How to style a checkbox using CSS
...leapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table style="width:100%">
<tr>
<td>Normal:</td>
<td><input type="checkbox" /></td>
<td><input type="checkbox" checked="checked" /></td>
<td>...