Define an R Function with a C++ Implementation
在R语言中可以使用scale方法来对数据进行中心化和标准化: #限定输出小数点后数字的位数为3位 > options(digits=3) > data <- c(1, 2, 3, 6, 3) #数据中心化 > scale(data, center=T,scale=F) [,1] [1,] -2 [2,] -1 [3,] 0 [4,] ...
若有如下程序: #define PI 3.1415926 #define A(r) 2*PI*r main() {float a,1; a=3.0; 1=A(a) ; printf("r=%.2f,1=%.2f\n",a,1); } 则程序运行后的输出结果是 ( ) A. r=3.00 1=18.85 B. 3.00,18.85 C. r=3.000000 1=18.8495555 D. r=3.0 1=18.8495555 ...
#define PI 3.1415 #define ARE(X) PI*x*x main() { int r=2; printf("%.2f",ARE(r+1)); } A.28.26B.28.260000C.9.28D.9.280000 答案 C[解析] 带参数的宏展开是在编译时进行的,是一种纯粹文字性的替换过程。本题定义了一个带参数宏#define ARE(x) PI*x*x,在printf()函数中使用了这个...
Step by step video & image solution for Define a function f:R->R by f(x)=max{|x|,|x-1|,...|x-2n|} where n is a fixed natural number then int_0^(2n) f(x) dx is by Maths experts to help you in doubts & scoring excellent marks in Class 12 exams.Updated on:21/07/2023...
The SQL query that is sent to the database replaces::view_extentwith a polygon in well-known text (WKT) format in the same spatial reference as the layer. Use a database-specific function and a spatial reference ID (SRID) to create geometry from the WKT extent polygon. The follow...
(quadruple, 4) FUNCTION(double, 2) #undef FUNCTION #define FUNCTION 34 #define OUTPUT(a) puts( #a ) int main(void) { printf("quadruple(13): %d\n", fun_quadruple(13) ); printf("double(21): %d\n", fun_double(21) ); printf("%d\n", FUNCTION); OUTPUT(billion); // note the...
程序中的:area=PI*r*r 会替换为3.1415926*r*r 如果你把#define语句中的数字9 写成字母g 预处理也照样带入。 2)typedef是在编译时处理的。它在自己的作用域内给一个已经存在的类型一个别名,但是You cannot use the typedef specifier inside a function definition。
百度试题 题目头文件中的ifndef/define/endif的作用是()。 A. 定义常量 B. 标记为特殊的头文件 C. 防止头文件被重复引用 D. 注释头文件 相关知识点: 试题来源: 解析 A.定义常量 反馈 收藏
LinkedIn On the ribbon, clickRaster Toolstab REMpanel Enhanced Regiondrop-down menu. Then click a selection method. For more information on the methods, seeSmart ObjectsandConnected Objects. Select one or more points to define the set of entities in the region. ...