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/*
* This file is part of the micropython-ulab project,
*
* https://github.com/v923z/micropython-ulab
*
* The MIT License (MIT)
*
* Copyright (c) 2019-2021 Zoltán Vörös
* 2020 Scott Shawcroft for Adafruit Industries
* 2020 Roberto Colistete Jr.
* 2020 Taku Fukada
*
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "py/obj.h"
#include "py/runtime.h"
#include "py/misc.h"
#include "../ulab.h"
#include "../ulab_tools.h"
#include "stats.h"
#if ULAB_MAX_DIMS > 1
#if ULAB_NUMPY_HAS_TRACE
//| def trace(m: ulab.numpy.ndarray) -> _float:
//| """
//| :param m: a square matrix
//|
//| Compute the trace of the matrix, the sum of its diagonal elements."""
//| ...
//|
static mp_obj_t stats_trace(mp_obj_t oin) {
ndarray_obj_t *ndarray = tools_object_is_square(oin);
mp_float_t trace = 0.0;
for(size_t i=0; i < ndarray->shape[ULAB_MAX_DIMS - 1]; i++) {
int32_t pos = i * (ndarray->strides[ULAB_MAX_DIMS - 1] + ndarray->strides[ULAB_MAX_DIMS - 2]);
trace += ndarray_get_float_index(ndarray->array, ndarray->dtype, pos/ndarray->itemsize);
}
if(ndarray->dtype == NDARRAY_FLOAT) {
return mp_obj_new_float(trace);
}
return mp_obj_new_int_from_float(trace);
}
MP_DEFINE_CONST_FUN_OBJ_1(stats_trace_obj, stats_trace);
#endif
#endif
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