symbols

问题 What's the difference between a string and a symbol in Ruby and when should I use one over the other? 回答1: The main difference is that multiple symbols representing a single value are identical whereas this is not true with strings. For example: irb(main):007:0> :test.object_id => 83618 irb(main):008:0> :test.object_id => 83618 irb(main):009:0> :test.object_id => 83618 Those are three references to the symbol :test , which are all the same object. irb(main):010:0> "test".object_id =>

问题 I have this code: ChiSq_Variance_test=function(critical_Chi_score,critical_Chi_square){ alfa=0.01; n=120; s_square=169; sigma_square=225; critical_Chi_square=qchisq(alfa,s-1); Chi_square_score=(n-1)*s_square/sigma_square; print(critical_Chi_square); print(Chi_square_score); }ChiSq_Variance_test(6) and it gives me this error: Error: unexpected symbol in:"enter code here }ChiSq_Variance_test" If you know a solution please help me! Thank for your time! 回答1: In R, in order to place two

问题 I have this code: ChiSq_Variance_test=function(critical_Chi_score,critical_Chi_square){ alfa=0.01; n=120; s_square=169; sigma_square=225; critical_Chi_square=qchisq(alfa,s-1); Chi_square_score=(n-1)*s_square/sigma_square; print(critical_Chi_square); print(Chi_square_score); }ChiSq_Variance_test(6) and it gives me this error: Error: unexpected symbol in:"enter code here }ChiSq_Variance_test" If you know a solution please help me! Thank for your time! 回答1: In R, in order to place two

问题 I created a density plot in ggplot and tried to use greek symbols in the legend. That is what I tried: value1 = 0.8 value2 = 0.8 value3 = 0 greeks <- list(bquote(rho==.(value1)), bquote(rho==.(value2)), bquote(rho==.(value3))) ggplot(data=df)+ stat_density(aes(x=R1, colour="rho = -0,6",linetype="rho = -0,6"), adjust=4, lwd=0.5, geom="line", position="identity")+ stat_density(aes(x=R2, colour="rho = 0,6",linetype="rho = 0,6"), adjust=4, lwd=0.5, geom="line", position="identity")+ stat_density

问题 I am having a problem I want to attach the registered trademark symbol a button and I want it to be done with jquery because there are lots and lots of buttons that require the sign when I used it with html for example(below) it worked. <input type="button" class="button_a" value="Value ®" /> But when I used jquery as below it returns as plain text: $('.button_a').each(function(){ $(this).attr("value",$(this).attr("value")+" ®"); }); I don't want to waste my time and space by putting ® in all

问题 I am trying to load a symbol file at the time of linking. I am providing the symbol.txt file along with other libraries that I link. These are the two things I tried. 1st, I provided the symbol file exactly as what was the output of arm-none-eabi-nm, but this returned with a syntax error on line 1 itself. 2nd, I changed the format a bit. I added #< SYMDEFS ># at the beginning of the file and made the changes to follow ARM's symdef file format. This gave me the error file not recognized: File

问题 I'm using Radau.f Fortran ode-solver and my gfortran complains about the use of * For example in: FF(I)=TI711*Z1I+TI712*Z2I+TI713*Z3I+TI714*Z4I+TI715*Z5I * +TI716*Z6I+TI717*Z7I what is * standing for? Is it an & such that the line should be: FF(I)=TI711*Z1I+TI712*Z2I+TI713*Z3I+TI714*Z4I+TI715*Z5I+& & +TI716*Z6I+TI717*Z7I Or is it supposed to be a comment or something else? 回答1: An asterisk in column 6 is a line continuation symbol and equivalent to & in fixed form . See here for details. In

问题 I'm having problems with this assignment I have to do for my java programming class. What I have to do is perform a chroma key technique on an image with a solid background. More info can be found here. The method I created works when I put the two object parameters for the method. But, when I put the parameters in the constructor and then try to use the method, I get a compiler error. I have my class down below (I have to use two different classes, one for methods, one for testing). Any help

问题 This question already has answers here : What exactly does `-rdynamic` do and when exactly is it needed? (3 answers) Closed last year . By default all symbols are exported to dynamic table, so why would we use -rdynamic flag? Even if we hide some symbols via attributes/ -fvisibility=hidden - -rdynamic doesn't change result, it doesn't unhide previously hidden symbols. So what's the point in it? 回答1: Symbols are only exported by default from shared libraries. -rdynamic tells linker to do the

问题 This question does a great job explaining how to get the symbols (variables, functions, etc) of an elf file. Now that I have the symbols I will like to know on what location (module) they are . For example if I compile a program that consists of the files main.c , someFile.h and someFile.c . Also let's say that the main.c program contains the global variable int Counter. then how I be able to tell that variable Counter is located in main.c? 回答1: the Answer is in here. . 来源： https:/