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argv_strided_complex64array2d

Convert a Node-API value representing a two-dimensional strided array to a single-precision complex floating-point array.

Installation

npm install @stdlib/napi-argv-strided-complex64array2d

Usage

var headerDir = require( '@stdlib/napi-argv-strided-complex64array2d' );

headerDir

Absolute file path for the directory containing header files for C APIs.

var dir = headerDir;
// returns <string>

Examples

var headerDir = require( '@stdlib/napi-argv-strided-complex64array2d' );

console.log( headerDir );
// => <string>

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C APIs

Usage

#include "stdlib/napi/argv_strided_complex64array2d.h"

stdlib_napi_argv_strided_complex64array2d( env, M, N, strideX1, strideX2, value, **data, *message1, *message2, *err )

Converts a Node-API value representing a two-dimensional strided array to a single-precision complex floating-point array.

#include "stdlib/napi/argv_strided_complex64array2d.h"
#include <node_api.h>
#include <stdint.h>

static napi_value addon( napi_env env, napi_callback_info info ) {
    napi_value value;

    // ...

    int64_t M = 100;
    int64_t N = 100;
    int64_t strideX1 = 100;
    int64_t strideX2 = 1;

    // ...

    float *X;
    napi_value err;
    napi_status status = stdlib_napi_argv_strided_complex64array2d( env, M, N, strideX1, strideX2, value, &X, "Must be a typed array.", "Must have sufficient elements.", &err );
    assert( status == napi_ok );
    if ( err != NULL ) {
        assert( napi_throw( env, err ) == napi_ok );
        return NULL;
    }

    // ...
}

The function accepts the following arguments:

• env: [in] napi_env environment under which the function is invoked.
• M: [in] int64_t number of rows.
• N: [in] int64_t number of columns.
• strideX1: [in] int64_t stride length along the first dimension.
• strideX2: [in] int64_t stride length along the second dimension.
• value: [in] napi_value Node-API value.
• data: [out] float** pointer for returning a reference to the output array.
• message1: [in] char* error message if a value is not a Float32Array.
• message2: [in] char* error message if a value has insufficient elements.
• err: [out] napi_value* pointer for storing a JavaScript error. If not provided a number, the function sets err with a JavaScript error; otherwise, err is set to NULL.

napi_status stdlib_napi_argv_strided_complex64array2d( const napi_env env, const int64_t M, const int64_t N, const int64_t strideX1, const int64_t strideX2, const napi_value value, float **data, const char *message1, const char *message2, napi_value *err );

The function returns a napi_status status code indicating success or failure (returns napi_ok if success).

STDLIB_NAPI_ARGV_STRIDED_COMPLEX64ARRAY2D( env, X, M, N, strideX1, strideX2, argv, index )

Macro for converting an add-on callback argument to a strided single-precision complex floating-point array.

#include "stdlib/napi/argv_strided_complex64array2d.h"
#include "stdlib/napi_argv_int64.h"
#include "stdlib/napi/argv.h"
#include <node_api.h>
#include <stdint.h>

static void fcn( const int64_t M, const int64_t N, const float *X, const int64_t strideX1, const int64_t strideX2, float *Y, const int64_t strideY1, const int64_t strideY2 ) {
    int64_t i;
    int64_t j;
    for ( i = 0; i < M*2; i += 2 ) {
        for ( j = 0; j < N*2; j += 2 ) {
            Y[ (i*strideY1)+(j*strideY2) ] = X[ (i*strideX1)+(j*strideX2) ];
            Y[ (i*strideY1)+(j*strideY2)+1 ] = X[ (i*strideX1)+(j*strideX2)+1 ];
        }
    }
}

// ...

static napi_value addon( napi_env env, napi_callback_info info ) {
    // Retrieve add-on callback arguments:
    STDLIB_NAPI_ARGV( env, info, argv, argc, 8 );

    // Convert the number of rows and columns to C types:
    STDLIB_NAPI_ARGV_INT64( env, M, argv, 0 );
    STDLIB_NAPI_ARGV_INT64( env, N, argv, 1 );

    // Convert the stride arguments to C types:
    STDLIB_NAPI_ARGV_INT64( env, strideX1, argv, 3 );
    STDLIB_NAPI_ARGV_INT64( env, strideX2, argv, 4 );
    STDLIB_NAPI_ARGV_INT64( env, strideY1, argv, 6 );
    STDLIB_NAPI_ARGV_INT64( env, strideY2, argv, 7 );

    // Convert the arrays to C types:
    STDLIB_NAPI_ARGV_STRIDED_COMPLEX64ARRAY2D( env, X, M, N, strideX1, strideX2, argv, 2 );
    STDLIB_NAPI_ARGV_STRIDED_COMPLEX64ARRAY2D( env, Y, M, N, strideY1, strideY2, argv, 5 );

    // ...

    fcn( M, N, X, strideX1, strideX2, Y, strideY1, strideY2 );
}

The macro expects the following arguments:

• env: environment under which the callback is invoked.
• X: output variable name for the array.
• M: number of rows.
• N: number of columns.
• strideX1: stride length along the first dimension.
• strideX2: stride length along the second dimension.
• argv: name of the variable containing add-on callback arguments.
• index: argument index.

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Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.