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WPF Data Binding and Validation Rules Best Practices
... I am using data binding to allow editing of some custom CLR objects. I am now wanting to put some input validation in when the user clicks save. However, all the WPF books I have read don't really devote any space to this issue. I see that you can create custom ValidationRules, but I am wondering i...
How to reorder data.table columns (without copying)
... @PeterPan See also NEWS about the devel version 1.10.5: "setcolorder() now accepts less than ncol(DT) columns to be moved to the front"
– Henrik
Oct 22 '17 at 12:21
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Are Databases and Functional Programming at odds?
I've been a web developer for some time now, and have recently started learning some functional programming. Like others, I've had some significant trouble apply many of these concepts to my professional work. For me, the primary reason for this is I see a conflict between between FP's goal of rem...
What does JVM flag CMSClassUnloadingEnabled actually do?
...y, I'm sorry, I have no clue. That was in 2012... I work on other projects now.
– Lukas Eder
Jan 18 '17 at 21:54
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show 3 more comments
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How to pretty-print a numpy.array without scientific notation and with given precision?
...ent zeros from being stripped from the end of floats:
np.set_printoptions now has a formatter parameter which allows you to specify a format function for each type.
np.set_printoptions(formatter={'float': '{: 0.3f}'.format})
print(x)
which prints
[ 0.078 0.480 0.413 0.830 0.776 0.102 0.51...
JSF backing bean structure (best practices)
...say -- 15 EL functions digging into that object from the JSF page, you are now tied not only to the bean, but to that object. Therefore it will be difficult to remove that object without breaking the UI.
– Zack Marrapese
Apr 16 '09 at 13:55
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JavaScript regex multiline flag doesn't work
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You are looking for the /.../s modifier, also known as the dotall modifier. It forces the dot . to also match newlines, which it does not do by default.
The bad news is that it does not exist in JavaScript (it does as of ES2018, see below). The good news is that you can ...
Debug.Assert vs Exception Throwing
...get). Yes, assertions should usually be impossible to fire, but you don't know what's possible when things go out in the wild. What you thought of as impossible might happen in production, and a responsible program should detect violated assumptions and act promptly.
– kizzx2
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General suggestions for debugging in R
...ou source() a .R file and it returns an error at line #n, but you need to know what function is located at line #n.
setBreakpoint() takes a source file name and line number and sets a breakpoint there
The codetools package, and particularly its checkUsage function can be particularly helpful in q...
How to sort an array in Bash
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Now, with the IFS, it splits your elements into little pieces if they have only one particular kind of whitespace in it. Good; not perfect :-)
– Limited Atonement
Jan 29 '16 at 14:56
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