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Writing a compiler in its own language
... following. You write a minimal compiler in assembler (yuck) for a minimal set of the language and then use that compiler to implement extra features of the language. Building your way up until you have a compiler with all the language features for itself. A painful process that is usually only done...
How can I make a ComboBox non-editable in .NET?
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To make the text portion of a ComboBox non-editable, set the DropDownStyle property to "DropDownList". The ComboBox is now essentially select-only for the user. You can do this in the Visual Studio designer, or in C# like this:
stateComboBox.DropDownStyle = ComboBoxStyle.Drop...
Passing variables in remote ssh command
...ygbjrbjrb
# Make a list of what you want to pass through SSH.
# (The “unset” is just in case someone exported
# an associative array with this name.)
unset -v VAR_NAMES
readonly VAR_NAMES=(
FOO
BAR
)
for name in "${VAR_NAMES[@]}"
do
printf '%s %s\0' "$name" "${!name}"
done | ssh us...
Any way to limit border length?
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The :after rocks :)
If you play a bit you can even set your resized border element to appear centered or to appear only if there is another element next to it (like in menus). Here is an example with a menu:
#menu > ul > li {
position: relative;
float: left;
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If strings are immutable in .NET, then why does Substring take O(n) time?
Given that strings are immutable in .NET, I'm wondering why they have been designed such that string.Substring() takes O( substring.Length ) time, instead of O(1) ?
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How can I change the color of a part of a TextView?
... "\n\n"
+ getText(R.string.currentversion) + CepVizyon.getLicenseText();
Spannable spannable = new SpannableString(text2);
spannable.setSpan(new ForegroundColorSpan(Color.WHITE), text.length(), (text + CepVizyon.getPhoneCode()).length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
myTextView...
Automatically plot different colored lines
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You could use 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 i...
Round to at most 2 decimal places (only if necessary)
I'd like to round at most 2 decimal places, but only if necessary .
79 Answers
79
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Extracting specific columns from a data frame
I have an R data frame with 6 columns, and I want to create a new dataframe that only has three of the columns.
10 Answers
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Using unset vs. setting a variable to empty
...e used. Matchers are wrappers to '[[' and besides returning a return code, set some meaningful message saying what was expected.
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