feat: add stats/strided/distances/dminkowski

[nakul-krishnakumar]

Resolves None.

Description

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This pull request:

• Adds stats/strided/distances/dminkowski.

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---

@stdlib-js/reviewers

[nakul-krishnakumar]

Please note that the c benchmarks takes longer than other stats/strided/distances implementations as here we benchmark for 4 different values of parameter p.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/strided/distances/dminkowski	$\color{green}400/400$ $\color{green}+100.00%$	$\color{green}23/23$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}400/400$ $\color{green}+100.00%$

The above coverage report was generated for the changes in this PR.

[kgryte]

@nakul-krishnakumar Mind resolving the C lint errors?

[nakul-krishnakumar]

@nakul-krishnakumar Mind resolving the C lint errors?

How do you want me to fix the error? Currently it raises error because of the powers array implementation done in the benchmark.length.c

int main( void ) {
	double elapsed;
	double *powers;
	int count;
	int iter;
	int len;
	int i;
	int j;
	int p;

	// Use the current time to seed the random number generator:
	srand( time( NULL ) );

	print_version();
	count = 0;
	powers = (double[]) { 1.0, 2.0, 10.0, INFINITY };
	for ( i = MIN; i <= MAX; i++ ) {
		len = pow( 10, i );
		iter = ITERATIONS / pow( 10, i-1 );
		for ( p = 0; p < 4; p++ ) {
			for ( j = 0; j < REPEATS; j++ ) {
				count += 1;
				printf( "# c::%s:len=%d:p=%.2f\n", NAME, len, powers[ p ] );
				elapsed = benchmark1( iter, len, powers[ p ] );
				print_results( iter, elapsed );
				printf( "ok %d benchmark finished\n", count );
			}
			for ( j = 0; j < REPEATS; j++ ) {
				count += 1;
				printf( "# c::%s:ndarray:len=%d:p=%.2f\n", NAME, len, powers[ p ] );
				elapsed = benchmark2( iter, len, powers[ p ] );
				print_results( iter, elapsed );
				printf( "ok %d benchmark finished\n", count );
			}
		}
	}
	print_summary( count, count );
}

Can I instead do static const double powers[4] = { 1.0, 2.0, 10.0, INFINITY }; ? @kgryte

[kgryte]

What is the point of unrolling the first element? Could you not just initialize d = 0.0 and then have the loop go from i = 0 to i < N? Seems like this is currently just wasting additional characters without a strong motivation.

[nakul-krishnakumar]

What is the point of unrolling the first element? Could you not just initialize d = 0.0 and then have the loop go from i = 0 to i < N? Seems like this is currently just wasting additional characters without a strong motivation.

I was just trying to mimic the implementation of dchebyshev where it is useful as it takes the max of residuals, but here as you said it does look redundant. Thank you for pointing that out. We will have to do the same refactoring for stats/strided/distances/dcityblock too then.

[kgryte]

Other than the use of PINF, this PR is looking good.

[kgryte]

LGTM