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1、cassandra分页查询案例,CAS非阻塞锁和synchronized重量级锁比较,Chromeapp实现网易云音乐歌单播放器,实现网易云音乐歌单播放器,C-minus语言编译器的词法分析部分Crc校验，通过算法验证数据的完整性,css3实现渐变色文字和镂空文字[CSS],cwRsync_4.0.5windows2008下配置,C调用Go的回调函数传递字符串[代码]函数返回多个对象#Goals:Towritefunctions#Towritefunctionsthatsendbackmultipleobjects.#FIRSTLEARNABOUTLISTS--X=list(height=5.
2、4,weight=54)print("Usedefaultprinting--")print(X)print("Accessingindividualelements--")cat("Yourheightis",X$height,"andyourweightis",X$weight,"")//C语言实现双向链表//C语言实现统计字符个数#FUNCTIONS--square<-function(x){return(x*x)}cat("Thesquareof3is",square(3),"")#defaultvalueoftheargissetto5.cube<-function(x=5)
3、{return(x*x*x);}cat("Callingcubewith2:",cube(2),"")#willgive2^3cat("Callingcube:",cube(),"")#willdefaultto5^3.#LEARNABOUTFUNCTIONSTHATRETURNMULTIPLEOBJECTS--powers<-function(x){parcel=list(x2=x*x,x3=x*x*x,x4=x*x*x*x);return(parcel);}//C语言随机函数rand实现//C语言顺序表完整实例//C语言实现文件的des加解密实例X=powers(3);print(
4、"Showingpowersof3--");print(X);#WRITINGTHISCOMPACTLY(4linesinsteadof7)powerful<-function(x){return(list(x2=x*x,x3=x*x*x,x4=x*x*x*x));}print("Showingpowersof3--");print(powerful(3));#InR,thelastexpressioninafunctionis,bydefault,whatis#returned.Soyoucouldequallyjustsay:powerful<-function(x){list(x2=x*
5、x,x3=x*x*x,x4=x*x*x*x)}[代码]向量符号#Goal:TheamazingRvectornotation.cat("EXAMPLE1:sin(x)foravector--")#Supposeyouhaveavectorx--x=c(0.1,0.6,1.0,1.5)#Thebadway--n=length(x)r=numeric(n)for(iin1:n){r[i]=sin(x[i])}print(r)#Thegoodway--don'tuseloops--print(sin(x))cat("EXAMPLE2:Computethemeanofeveryrowofa
6、matrix--")#Here'sanotherexample.Itisn'treallyaboutR;it'saboutthinkingin#matrixnotation.Butstill.#Letmesetupamatrix--N=4;M=100;r=matrix(runif(N*M),N,M)#SoIfaceaNxMmatrix#[r11r12...r1N]#[r21r22...r2N]#[r32r32...r3N]#Mygoal:eachcolumnneedstobereducedtoamean.#Method1usesloops:mean1=numeric(M)for(iin1:
7、M){mean1[i]=mean(r[,i])}#Alternatively,justsay:mean2=rep(1/N,N)%*%r#Pretty!#Thetwoanswersarethesame--all.equal(mean1,mean2[,])##Asanaside,Ishouldsaythatyoucandothisdirectlybyusing#therowMeans()functio
