質問編集履歴
1
コード、コンパイル方法の追加
test
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test
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@@ -9,3 +9,129 @@
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参考にしたサイトのURLはこちらです。
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https://qiita.com/motacapla/items/01de7d59cacb3f96caaf
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cのコード 引数の行列の全要素にnを足すもの
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```
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#include <stdio.h>
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void add_matrix(double **matrix, int row, int col, int n) {
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int i, j;
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for(i=0; i<row; i++){
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for(j=0; j<col; j++){
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matrix[i][j] = matrix[i][j] + n;
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}
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}
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}
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```
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コンパイル方法
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```
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gcc -cpp -fPIC -shared libadd.c -lm -o libadd.so -O3
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```
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pythonコード
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```
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from ctypes import *
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import ctypes.util
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from numpy.ctypeslib import ndpointer
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import numpy as np
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from numpy.random import *
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#さっきつくったlibadd.soファイルを指定
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lib = np.ctypeslib.load_library("libadd.so",".")
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#適当につくります
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row = 20
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col = 5
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n = 5
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matrix = rand(row, col)
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#doubleのポインタのポインタ型を用意
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_DOUBLE_PP = ndpointer(dtype=np.uintp, ndim=1, flags='C')
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#add_matrix()関数の引数の型を指定(ctypes)
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lib.add_matrix.argtypes = [_DOUBLE_PP, c_int32, c_int32, c_int32]
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#add_matrix()関数が返す値の型を指定(今回は返り値なし)
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lib.add_matrix.restype = None
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#おまじない
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tp = np.uintp
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mpp = (matrix.__array_interface__['data'][0] + np.arange(matrix.shape[0])*matrix.strides[0]).astype(tp)
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#int型もctypeのc_int型へ変換して渡す
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n = ctypes.c_int(n)
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row = ctypes.c_int(row)
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col = ctypes.c_int(col)
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print("before:", matrix)
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lib.add_matrix(mpp, row, col, n)
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print("after:", matrix)
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```
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