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,] ...
7.$$ L e t y = f ( x ) $$ b e a function define d onR,$$ a n d f ( x ) + \frac { 1 } { f ( x + 2 ) } = 0 ( x \in R ) . $$. Then f(x) is( B)(A) not a periodic function.(B) a periodic function with th e minimal positiv e per...
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 ...
(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...
Define a function f:R->R by f(x)=max{|x|,|x-1|,...|x-2n|} where n is a fixed natural number then int0^(2n) f(x) dx is
Log In Sign Up Subjects Math Algebra Euclidean vector Define a vector function r that traces out the directed line segment from (1,1,-2) to (3,5,4).Question:Define a vector function r that traces out the directed line segment from (1,1,-2) to (3,5,...
$$ L e t y = f ( x ) $$b e a function define d onR,$$ a n d y = f ( x - 1 ) $$b e an od d function and$$ y = f ( x + 3 ) $$b e an even function. Then f(x) is( D)(A) not a periodic function.(B) a periodic function with th e ...
#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...
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。