symbols

问题 I recently found out that it is possible to add greek alphabets and other symbols within the annotate text in ggplot. I am trying to add arrows (upwards and downwards) to my text and I can't seem to find the correct numerical code for it. I tried searching but can't find a list of codes online. The syntax is something like that under label: label="'test text ' * symbol('\\205')" \142 gives a beta symbol and \154 gives a gamma symbol. Anyone knows how does this code works? Thanks! 回答1: The

问题 Is there any way to include Greek letters (α,β,γ) into column names of a matrix? i know you use : colnames()<-c("column 1","column 2","column 3".....) to add column names but when i tried to paste in the letters... colnames(mymatrix)<-c("random name","parameters(α,β,γ)","parameters2(α,β,γ)") it shows the "(α,β,γ)" as "(??,??,??)" Does anyone know how to do this as i need it to be really obvious for reports at work 来源： https://stackoverflow.com/questions/26179741/putting-greek-letters-in

问题 Suppose I define x as symbol function foo (defn foo [x] x) (def x foo) Can the name "foo" be discovered if only given x? Is there a way within foo to look up the name of the function x - "foo" in this case? (foo x) Is there or is it possible to create a function such as: (get-fn-name x) foo 回答1: A similar question was asked recently on this site; see here When you do (def x foo) , you are defining x to be "the value at foo ", not " foo itself". Once foo has resolved to its value, that value

问题 Where can I find "Load Symbols Lazily" option in Xcode6? I Couldn't find it in 'preference' 回答1: That option was specific to gdb, and went away when Xcode stopped supporting gdb. lldb does most of the tricks that the "Load Symbols Lazily" and others, so that turning on options like this by hand should not be necessary. If you are still seeing slow symbol loading with lldb, please sample Xcode while it is slow and file bugs with the samples. 回答2: Load Symbols Lazily" option is not available in

问题 This question already has answers here : What is “operator<<” called? (8 answers) Closed 2 years ago . I'm wondering if there is a standard name for the "<<" and ">>" operators? This is mostly in the context of teaching C++ and using those operators as part of stream input/output. If I need to read code or prompt for student responses (such as cout << "Hello"; ), I'm not sure how to verbalize those symbols. Is there a convention when reading them out loud? 回答1: When not overloaded, left-shift

问题 I would like to set values to a list of variables, like so: list[[1]] = 2 and if list[[1]] is a , then a will now be equal to two. How can I achieve this? 回答1: Well, let's try it naively: Make a list: In[1]:= ClearAll[list, a, b, c]; list = {a, b, c}; It's as we expect it: In[3]:= list Out[3]= {a, b, c} Set the first element to 2: In[4]:= list[[1]] = 2 Out[4]= 2 In[5]:= list Out[5]= {2, b, c} That doesn't affect a: In[6]:= a Out[6]= a Start again: In[7]:= ClearAll[list, a, b, c]; list = {a, b

问题 I am getting build failed, I tried so many things but I couldn't figure out how to solve it duplicate symbol _GSDK_GTMNSDataZLibExportToSuppressLibToolWarning in: /Users/Macpro/Documents/evoteam/ClassifiedTemplate/../Pods/GoogleUtilities/Libraries/libGTM_NSData+zlib_external.a(GTMNSData+zlib.o) /Users/Macpro/Documents/evoteam/Pods/GoogleUtilities/Libraries/libGTM_NSData+zlib_external.a(GTMNSData+zlib.o) ld: 1 duplicate symbol for architecture x86_64 thank you for any help. 回答1: Add it to your

问题 I have a plot with pairs of points that are slightly offset. Each pair of points has associated error bars. I have specified that the symbol of the first point in the pair is different from that of the second (closed circle vs open circle). I would like it so that the error bars do not show through the open symbol. Here is a mock data set: x = runif(4,-2,2) x_1 = runif(4,-1,3) dfr <- data.frame( x = c(x, x_1), y = rep(c("A","B","C","D"), 2), upper = c(x+2, x_1+1), lower = c(x-2, x_1-2), type

问题 I referred to this answer in coloring specific rows of a table in the GUI, however, I get some weird symbols instead of actual numbers present in those rows as shown below: This is the line of code I am using to color: DataTable = [num2cell(handles.zRaw), num2cell(handles.pRaw), num2cell(handles.zMob),... num2cell(handles.PressGrubbs), num2cell(handles.PressRosner), handles.OutlCheckGRubbs,... handles.OutlCheckRosner, num2cell(handles.iZones), num2cell(handles.iExcessPress)]; %# Use HTML to

问题 Is it possible to split a symbol without first converting it to a string? For example, I've tried :split_this.split("_") and it only returns an error. I've looked through the Symbol class reference, but all the example use to_s to convert it to a string. I know I can convert it to a string, split it, and convert the two substrings to symbols, but that just seems a bit cumbersome. Is there a more elegant way to do this? 回答1: Since Ruby 1.9 some string's features are added to the Symbol class