remove axis numpy array

To remove an axis from a NumPy array in C, you can use the reshape function. Here's an example:

#include <stdio.h>
#include <stdlib.h>
#include <numpy/arrayobject.h>

int main() {
    Py_Initialize();
    import_array();

    // Create a 2D NumPy array
    npy_intp dims[2] = {3, 4}; // dimensions of the array
    PyObject* array = PyArray_SimpleNew(2, dims, NPY_DOUBLE);

    // Reshape the array to remove the second axis
    npy_intp new_dims[1] = {dims[0]};
    PyObject reshaped_array = PyArray_Newshape((PyArrayObject)array, new_dims, NPY_CORDER);

    // Print the reshaped array
    double data = PyArray_DATA((PyArrayObject)reshaped_array);
    for (int i = 0; i < new_dims[0]; i++) {
        printf("%f ", data[i]);
    }
    printf("\n");

    Py_DECREF(array);
    Py_DECREF(reshaped_array);
    Py_Finalize();
    return 0;
}

In this example, we first create a 2D NumPy array using the PyArray_SimpleNew function. Then, we use the PyArray_Newshape function to reshape the array and remove the second axis. Finally, we print the reshaped array using a loop.

Note that before running this code, you need to have the NumPy C API installed and linked correctly with your C code. You also need to include the necessary headers and initialize the Python interpreter using Py_Initialize().