variable-names | 易学教程

ggplot does not work in function, passing in variable names as strings

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问题 I have following simple function but its ggplot command does not work. The command works all right when given from command line: > testfn <- function(gdf, first, second){ library(ggplot2) print(ggplot(gdf, aes(first, second)) + geom_point()) } > > testfn(mydataf, vnum1, vnum2) Error in eval(expr, envir, enclos) : object 'second' not found > > ggplot(mydataf, aes(vnum1, vnum2)) + geom_point() > (plots graph without any error) I tried to use aes_string instead of aes ; and also using x=first, y

Pass variable name to plotting function title

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问题 I was wondering if anyone could help me use a variable name within a function. I've put together a dot plot that sorts variables and then produces a bitmap, but I can't get R to pass the variable name to the plot title. Example data id<-c(1,2,3) blood<-c(1,2,10) weight<-c(1,2,13) mydata<-as.data.frame(cbind(id,blood,weight)) mydata$blood #######SORTED DOT PLOT#### Dplotter<-function (id,x,Title=""){ if (is.null(Title)) {Title=""} else {Title=Title} DIR<-paste("C:/temp/WholePlots/New/",Title,"

Pass variable name to plotting function title

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Using the component ID as widgetVar name

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问题 I have a simple question about component IDs and dialog (or other components) widget variable name. Is there a problem of using the component ID as widget variable name of the same component? E.g. <p:dialog id="dlgRelConsultasRealizadas" widgetVar="dlgRelConsultasRealizadas" .../> 回答1: This piece of JSF generates basically the following HTML (not exactly that, but in effects the same): <body> <div id="dlgRelConsultasRealizadas">...</div>  <script>var

Java Swing, 100 TextFields have similar task, So I want to write the one function to do so

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问题 I am working on a small project (with NetBeans' Java GUI Builder) in which I have 100 TextFields which does exact same thing on different data . They are arranged in 10 rows and 10 columns , there (Variable) names are like: txt11, txt12, ... txt110 txt21, txt22, ... txt210 . . ... . txt101, txt102, ... txt1010 so, that there names can easily generated by the row and column number as well as I can easily extract the row and the column of a TextField to which it belongs (But I can not). Since

is there any restriction on variable name so that it should not conflict with package name?

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问题 Suppose, I have one Test class in test package: package test; public class Test { private static int clarying=20; public static void main(String[] args) { clarying.Product.display(clarying); // this line is giving error // The primitive type int of // clarying does not have a field Product } } Suppose, I have another class Product in clarying package: package clarying; public class Product { private static int test; public static void display(int data) { test = data; System.out.println(test);

Is there a convention, when using Java RMI, to use the dollar sign $ in a variable name?

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问题 I realize that it is a valid part of a variable name, but I've never seen variable names actually use the symbol $ before. The Java tutorial says this: Additionally, the dollar sign character, by convention, is never used at all. You may find some situations where auto-generated names will contain the dollar sign, but your variable names should always avoid using it. However, since this is geared toward Java beginners, I'm wondering if in the distributed world, the $ lives on with a special

Safest way to change variable names in a project

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问题 So I've been working on a relatively large project by myself, and I've come to realise that some of the variable names earlier on were.. less than ideal. But how does one change variable names in a project easily? Is there such a tool that can go through a project directory, parse all the files, and then replace the variable names to the desired one? It has to be smart enough to understand the language I imagine. I was thinking of using regexp (sed/awk on linux?) tools to just replace the

Does variable name length matter for performance in PHP?

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问题 I have been seen this Does variable name length matter for performance C#? topic and have same question about php. My co-worker (Front-end) have been encoded everything like $o, $r, $x, $m, $c and motivated it best performance. I really very doubt about it and code became difficult to read. $o - object or obj $m - $model $r - $query_result or $result $x - $xml_node Every thing look like if ( isset ( self::$o[ self::$x -> name ] ) ) : $c = 'ClassPrefix_' . self::$o[ self::$x -> name ]; $o =

Non-ASCII Python identifiers and reflectivity [duplicate]

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问题 This question already has answers here : Identifier normalization: Why is the micro sign converted into the Greek letter mu? (2 answers) Closed last year . I have learnt from PEP 3131 that non-ASCII identifiers were supported in Python, though it's not considered best practice. However, I get this strange behaviour, where my 𝜏 identifier (U+1D70F) seems to be automatically converted to τ (U+03C4). class Base(object): def __init__(self): self.𝜏 = 5 # defined with U+1D70F a = Base() print(a.𝜏)