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I have been trying to import a C code in python file. But its not working. So I’ve decided to convert the C program into Python so that importing the function will be easier. The C code I want to convert is given below. (I got this from github)
Nội dung chính
- Can I convert C program to Python?
- How do you convert C to F in Python?
- Is Python created from C?
- Can we convert C++ to Python?
#include “Python.h”
#include “numpy/arrayobject.h”
#include <math.h>
# define CUBE(x) ((x) * (x) * (x))
# define SQR(x) ((x) * (x))
static PyObject *interp3_tricubic(PyObject *self, PyObject *args);
float TriCubic (float px, float py, float pz, float *volume, int xDim, int yDim, int zDim);
// what function are exported
static PyMethodDef tricubicmethods[] =
“_interp3_tricubic”, interp3_tricubic, METH_VARARGS,
NULL, NULL
;
// This function is essential for an extension for Numpy created in C
void inittricubic()
(void) Py_InitModule(“tricubic”, tricubicmethods);
import_array();
// the data should be FLOAT32 and should be ensured in the wrapper
static PyObject *interp3_tricubic(PyObject *self, PyObject *args)
= NPY_OWNDATA;
// massive use of iterators to progress through the data
PyArrayIterObject *itr_v, *itr_r, *itr_c, *itr_s;
itr_v = (PyArrayIterObject *) PyArray_IterNew(result);
itr_r = (PyArrayIterObject *) PyArray_IterNew(R);
itr_c = (PyArrayIterObject *) PyArray_IterNew(C);
itr_s = (PyArrayIterObject *) PyArray_IterNew(S);
pvol = (float *)PyArray_DATA(volume);
xdim = PyArray_DIM(volume, 0);
ydim = PyArray_DIM(volume, 1);
zdim = PyArray_DIM(volume, 2);
while(PyArray_ITER_NOTDONE(itr_v))
pvc = (float *) PyArray_ITER_DATA(itr_v);
pr = (float *) PyArray_ITE R_DATA(itr_r);
pc = (float *) PyArray_ITER_DATA(itr_c);
ps = (float *) PyArray_ITER_DATA(itr_s);
*pvc = TriCubic(*pc, *pr, *ps, pvol, xdim, ydim, zdim);
PyArray_ITER_NEXT(itr_v);
PyArray_ITER_NEXT(itr_r);
PyArray_ITER_NEXT(itr_c);
PyArray_ITER_NEXT(itr_s);
return result;
/*
* TriCubic – tri-cubic interpolation point, p..
* inputs:
* px, py, pz – the interpolation point.
* volume – a pointer to the float volume data, stored in x,
* y, then z order (x index increasing fastest).
* xDim, yDim, zDim – dimensions of the array of volume data.
* returns:
* the interpolated value p..
* note:
* rudimentary range checking is done in this function.
*/
float TriCubic (float px, float py, float pz, float *volume, int xDim, int yDim, int zDim)
I have tried to convert this code to python. But the output I got is wrong. The python code I created is added below.
import numpy as N
import math
import scipy
global result
def interp3_tricubic(volume, C, R, S):
if volume is None :
result = 0
elif C is None:
result = 0
elif R is None:
result = 0
elif S is None:
result = 0
else:
result = N.zeros(len(C), dtype=(‘float’))
tri_v = N.array(volume, dtype=(“float”))
tri_r = N.array(R, dtype=(“float”))
tri_c = N.array(C, dtype=(“float”))
tri_s = N.array(S, dtype=(“float”))
tri_vol = N.array(volume, dtype=(“float”))
xDim = volume.shape[0]
yDim = volume.shape[1]
zDim = volume.shape[2]
for i in range(len(C)):
tri_v = TriCubic(tri_c[i], tri_r[i], tri_s[i], volume, xDim, yDim, zDim)
i = i + 1
# print(tri_v, “tri_v”)
return tri_v
def TriCubic ( px, py, pz, volume, xDim, yDim, zDim):
xyDim = xDim * yDim
x = px.astype(int)
y = py.astype(int)
z = pz.astype(int)
dx = px – x
dy = py – y
dz = pz – z
pv = volume + (x – 1) + (y – 1) * xDim + (z – 1) * xyDim;
def cube(num):
return num * num * num
def sqrt(num):
return num * num
u = N.array([0,0,0,0], dtype=(‘float’))
v = N.array([0,0,0,0], dtype=(‘float’))
w = N.array([0,0,0,0], dtype=(‘float’))
vox = N.zeros_like(volume, dtype=(‘float’))
u[0] = -0.5 * cube (dx) + sqrt (dx) – 0.5 * dx;
u[1] = 1.5 * cube (dx) – 2.5 * sqrt (dx) + 1;
u[2] = -1.5 * cube (dx) + 2 * sqrt (dx) + 0.5 * dx;
u[3] = 0.5 * cube (dx) – 0.5 * sqrt (dx);
v[0] = -0.5 * cube (dy) + sqrt (dy) – 0.5 * dy;
v[1] = 1.5 * cube (dy) – 2.5 * sqrt (dy) + 1;
v[2] = -1.5 * cube (dy) + 2 * sqrt (dy) + 0.5 * dy;
v[3] = 0.5 * cube (dy) – 0.5 * sqrt (dy);
w[0] = -0.5 * cube (dz) + sqrt (dz) – 0.5 * dz;
w[1] = 1.5 * cube (dz) – 2.5 * sqrt (dz) + 1;
w[2] = -1.5 * cube (dz) + 2 * sqrt (dz) + 0.5 * dz;
w[3] = 0.5 * cube (dz) – 0.5 * sqrt (dz);
k = 0
j = 0
i = 0
q = [0,0,0,0]
r = [0,0,0,0]
for k in range(4):
for j in range(4):
for i in range(4):
r[j] += u[i] * pv[i]
i = i+1
q[k] += v[j] * r[j]
pv += xDim – 4
j = j+1
vox += w[k] * q[k]
pv += xyDim – 4 * xDim
k = k+1
return vox
I am confused on the meaning of some
lines. Like these lines…
static PyObject *interp3_tricubic(PyObject *self, PyObject *args);
itr_v = (PyArrayIterObject *) PyArray_IterNew(result);
r[j] += u[i] * *pv;
Please help me correct the code. I am stuck!
Can I convert C program to Python?
Using File I/O we were able to convert C code written in one text file to Python code in another text file with the application of multiple function that could identify and accordingly process specific key words and formats used in the C language.
How do you convert C to F in Python?
Example:. celsius_1 = float(input(“Temperature value in degree Celsius: ” )). # For Converting the temperature to degree Fahrenheit by using the above.. # given formula.. Fahrenheit_1 = (celsius_1 * 1.8) + 32.. # print the result.. print(‘The %. 2f degree Celsius is equal to: %. … . %(celsius_1, Fahrenheit_1)). print(“—-OR—-“).
Is Python created from C?
Python is written in C (actually the default implementation is called CPython).
Can we convert C++ to Python?
If we are speaking fundamentally, then yes you can most definitely convert your C++ program to Python. This is because all programming languages are Turing complete which means that all languages can achieve the same algorithms, solve the same problems, make similar programs, and so on.
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