examples/example04.cpp · Job/NumCpp

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numcpp

examples

example04.cpp

example04.cpp 2.68 KB

#include <numcpp.h>
using namespace numcpp;

int main()
{
 auto x = array({1,2,3,
 4,5,6,
 7,8,9}, 3, 3);

auto y = x; // create a view of x

auto z = copy(x); // create a deep copy of x

auto x1 = x(2,2); // access element at index 2,2
 print(x1); // x1 = 9

auto x2 = x( S{0,2}, S{0,2} ); // select block within x
 print(x2); // x2 = [1 2; 4 5]

auto x3 = x( S{0,-1,2}, S{0,-1,2} ); // select strided block within x
 print(x3); // x3 = [1 3; 7 9]

auto x4 = x( full, 0 ); // select first column of x
 print(x4); // x4 = [1 4 7]

x(S{0,-1,2}, full) = 1; // set first and last row to one
 print(x); // [1 1 1; 4 5 6; 1 1 1]

x(1, full) = z(0, full); // copy first row of z into the second row of x
 print(x); // [1 1 1; 1 2 3; 1 1 1]

auto u = eval(range(0,10)); // create array u = [0 ... 9]
 //auto u1 = u(V{0, 1, 7, 5}); // non-regular indexing of u
 //print(u1); // u1 = [0 1 6 4]
}

/*!
@page example04 Array Slicing
This is a simple example showing the indexing an slicing capabilities of NumCpp.

@code
#include <numcpp.h>
using namespace numcpp;

int main()
{
 auto x = array({1,2,3,
 4,5,6,
 7,8,9}, 3, 3);

auto y = x; // create a view of x

auto z = copy(x); // create a deep copy of x

auto x1 = x(2,2); // access element at index 2,2
 print(x1); // x1 = 9

auto x2 = x( S{0,2}, S{0,2} ); // select block within x
 print(x2); // x2 = [1 2; 4 5]

auto x3 = x( S{0,end,2}, S{0,end,2} ); // select strided block within x
 print(x3); // x3 = [1 3; 7 9]

auto x4 = x( full, 0 ); // select first column of x
 print(x4); // x4 = [1 4 7]

x(S{0,end,2}, full) = 1; // set first and last row to one
 print(x); // [1 1 1; 4 5 6; 1 1 1]

x(1, full) = z(0, full); // copy first row of z into the second row of x
 print(x); // [1 1 1; 1 2 3; 1 1 1]

auto u = eval(range(0,10)); // create array u = [0 ... 9]
 auto u1 = u(V{0, 1, 7, 5}); // non-regular indexing of u
 print(u1); // u1 = [0 1 6 4]
}

@endcode
*/

一键复制编辑原始数据按行查看历史

Tobias Knopp 提交于 2013年10月21日 14:12 +08:00 . fix

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

#include <numcpp.h>
using namespace numcpp;

int main()
{
 auto x = array({1,2,3,
 4,5,6,
 7,8,9}, 3, 3);

 auto y = x; // create a view of x

 auto z = copy(x); // create a deep copy of x

 auto x1 = x(2,2); // access element at index 2,2
 print(x1); // x1 = 9

 auto x2 = x( S{0,2}, S{0,2} ); // select block within x
 print(x2); // x2 = [1 2; 4 5]

 auto x3 = x( S{0,-1,2}, S{0,-1,2} ); // select strided block within x
 print(x3); // x3 = [1 3; 7 9]

 auto x4 = x( full, 0 ); // select first column of x
 print(x4); // x4 = [1 4 7]

 x(S{0,-1,2}, full) = 1; // set first and last row to one
 print(x); // [1 1 1; 4 5 6; 1 1 1]

 x(1, full) = z(0, full); // copy first row of z into the second row of x
 print(x); // [1 1 1; 1 2 3; 1 1 1]

 auto u = eval(range(0,10)); // create array u = [0 ... 9]
 //auto u1 = u(V{0, 1, 7, 5}); // non-regular indexing of u
 //print(u1); // u1 = [0 1 6 4]
}

/*!
@page example04 Array Slicing
This is a simple example showing the indexing an slicing capabilities of NumCpp.

@code
#include <numcpp.h>
using namespace numcpp;

int main()
{
 auto x = array({1,2,3,
 4,5,6,
 7,8,9}, 3, 3);

 auto y = x; // create a view of x

 auto z = copy(x); // create a deep copy of x

 auto x1 = x(2,2); // access element at index 2,2
 print(x1); // x1 = 9

 auto x2 = x( S{0,2}, S{0,2} ); // select block within x
 print(x2); // x2 = [1 2; 4 5]

 auto x3 = x( S{0,end,2}, S{0,end,2} ); // select strided block within x
 print(x3); // x3 = [1 3; 7 9]

 auto x4 = x( full, 0 ); // select first column of x
 print(x4); // x4 = [1 4 7]

 x(S{0,end,2}, full) = 1; // set first and last row to one
 print(x); // [1 1 1; 4 5 6; 1 1 1]

 x(1, full) = z(0, full); // copy first row of z into the second row of x
 print(x); // [1 1 1; 1 2 3; 1 1 1]

 auto u = eval(range(0,10)); // create array u = [0 ... 9]
 auto u1 = u(V{0, 1, 7, 5}); // non-regular indexing of u
 print(u1); // u1 = [0 1 6 4]
}

@endcode
*/