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Passing arguments with spaces between (bash) script
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$*, unquoted, expands to two words. You need to quote it so that someApp receives a single argument.
someApp "$*"
It's possible that you want to use $@ instead, so that someApp would receive two arguments if you were to call b.sh as
b.sh 'My first' 'My second'
With someApp "$*", someAp...
Omit rows containing specific column of NA
I want to know how to omit NA values in a data frame, but only in some columns I am interested in.
8 Answers
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SVG fill color transparency / alpha?
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You use an addtional attribute; fill-opacity: This attribute takes a decimal number between 0.0 and 1.0, inclusive; where 0.0 is completely transparent.
For example:
<rect ... fill="#044B94" fill-opacity="0.4"/>
Additionally you have the following:
stroke-opacity attribute for the stro...
Allowed memory size of 33554432 bytes exhausted (tried to allocate 43148176 bytes) in php
This error message is being presented, any suggestions?
21 Answers
21
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Sleeping in a batch file
When writing a batch file to automate something on a Windows box, I've needed to pause its execution for several seconds (usually in a test/wait loop, waiting for a process to start). At the time, the best solution I could find uses ping (I kid you not) to achieve the desired effect. I've found a be...
Where is the documentation for the values() method of Enum?
I declare an enum as :
3 Answers
3
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Evaluate expression given as a string
I'm curious to know if R can use its eval() function to perform calculations provided by e.g. a string.
7 Answers
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Use numpy array in shared memory for multiprocessing
I would like to use a numpy array in shared memory for use with the multiprocessing module. The difficulty is using it like a numpy array, and not just as a ctypes array.
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Why should a Java class implement comparable?
Why is Java Comparable used? Why would someone implement Comparable in a class? What is a real life example where you need to implement comparable?
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Does the 'mutable' keyword have any purpose other than allowing the variable to be modified by a con
A while ago I came across some code that marked a member variable of a class with the mutable keyword. As far as I can see it simply allows you to modify a variable in a const method:
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