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What is the use of the pipe symbol in YAML?
...that any indented text that follows should be interpreted as a multi-line scalar value. See the YAML spec.
Specifically, the pipe indicates that (except for the indentation) the scalar value should be interpreted literally in such a way that preserves newlines. Conversely, the > character indi...
How to deal with “data of class uneval” error from ggplot2?
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Another cause is accidentally putting the data=... inside the aes(...) instead of outside:
RIGHT:
ggplot(data=df[df$var7=='9-06',], aes(x=lifetime,y=rep_rate,group=mdcp,color=mdcp) ...)
WRONG:
ggplot(aes(data=df[df$var7=='9-06',],x...
Groovy / grails how to determine a data type?
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To determine the class of an object simply call:
someObject.getClass()
You can abbreviate this to someObject.class in most cases. However, if you use this on a Map it will try to retrieve the value with key 'class'. Because of this, I always use getClass() even tho...
Printing newlines with print() in R
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An alternative to cat() is writeLines():
> writeLines("File not supplied.\nUsage: ./program F=filename")
File not supplied.
Usage: ./program F=filename
>
An advantage is that you don't have to remember to append a "\n" to the string p...
Visual studio long compilation when replacing int with double
... the Windows Defender service, the one that actually performs the malware scans. Disabling it by unticking the "Turn on real-time protection" option instantly fixes the delay. So does adding the path where I store projects to the "Excluded file locations" box, probably your preferred approach.
I'...
How to put comments in Django templates
... {% comment %}...{% endcomment %} is used for multi-line comments, but you can also comment out text on the same line like this:
{# some text #}
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optional parameters in SQL Server stored proc?
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You can declare like this
CREATE PROCEDURE MyProcName
@Parameter1 INT = 1,
@Parameter2 VARCHAR (100) = 'StringValue',
@Parameter3 VARCHAR (100) = NULL
AS
/* check for the NULL / default value (indicating nothing was...
How to get the path of current worksheet in VBA?
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Use Application.ActiveWorkbook.Path for just the path itself (without the workbook name) or Application.ActiveWorkbook.FullName for the path with the workbook name.
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Which characters are illegal within a branch name?
...fname:
Git imposes the following rules on how references are named:
They can include slash / for hierarchical (directory) grouping, but no slash-separated component can begin with a dot . or end with the sequence .lock.
They must contain at least one /. This enforces the presence of a category li...
how to know if the request is ajax in asp.net mvc?
anybody how can I know if the request is ajax ? (I'm using jquery for ajax)
3 Answers
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