df?EditIdxPtr

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 6/30/2025

Version

Public

df?EditIdxPtr

Modifies a pointer to the memory representing a coordinate of the data stored in matrix format.

Syntax

status = dfsEditIdxPtr(task, ptr_attr, idx, ptr)

status = dfdEditIdxPtr(task, ptr_attr, idx, ptr)

Include Files

mkl.h

Input Parameters

Name	Type	Description
task	DFTaskPtr	Descriptor of the task.
ptr_attr	const MKL_INT	Type of the data to be modified. The parameter takes one of the values described in "Data Attributes Supported by the df?EditIdxPtr Task Editor".
idx	const MKL_INT	Index of the coordinate whose pointer is to be modified.
ptr	const float* for dfsEditIdxPtr const double* for dfdEditIdxPtr	Pointer to the data that holds values of coordinate idx. For details, see table "Data Attributes Supported by the df?EditIdxPtr Task Editor".

Output Parameters

Name	Type	Description
status	int	Status of the routine: DF_STATUS_OK if the routine execution completed successfully. Non-zero error code otherwise. See "Task Status and Error Reporting" for error code definitions.

Name

Type

Description

status

int

Status of the routine:

DF_STATUS_OK if the routine execution completed successfully.
Non-zero error code otherwise. See "Task Status and Error Reporting" for error code definitions.

Description

The routine modifies a pointer to the array that holds the idx coordinate of vector-valued function y or the pointer to the array of spline coefficients corresponding to the given coordinate.

You can use the editor if you need to pass into a Data Fitting task or modify the pointer to coordinates of the vector-valued function or spline coefficients held at non-contiguous memory locations. Do not use the editor for coordinates at contiguous memory locations in row-major format.

Before calling this editor, make sure that you have created and initialized the task using a task creation function or a relevant editor such as the generic or specific df?EditPPSpline1D editor.

Data Attributes Supported by the df?EditIdxPtr Task Editor
Data Attribute	Description
DF_Y	Vector-valued function y
DF_PP_SCOEFF	Piecewise polynomial spline coefficients

When using df?EditIdxPtr, you might receive an error code in the following cases:

You passed an unsupported parameter value into the editor.
The value of the index exceeds the predefined value that equals the dimension ny of the vector-valued function.
You pass a NULL pointer to the editor. In this case, the task remains unchanged.
You pass a pointer to the idx coordinate of the vector-valued function you provided to contiguous memory in column-major format.

The code example below demonstrates how to use the editor for providing values of a vector-valued function stored in two non-contiguous arrays:

#define NX 1000  /* number of break points       */
#define NY 2     /* dimension of vector-valued function */
int main()
{
    DFTaskPtr task;
    double x[NX];
    double y1[NX], y2[NX]; /* vector-valued function is stored as two arrays */
    /* Provide first coordinate of two-dimensional function y into creation routine */
    status = dfdNewTask1D( &task, NX, x, DF_NON_UNIFORM_PARTITION, NY, y1,
                           DF_1ST_COORDINATE );
    /* Provide second coordiante of two–dimensional function */
    status = dfdEditIdxPtr(task, DF_Y, 1, y2 );
    ...
}

Parent topic: Task Configuration Routines

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Developer Reference for Intel® oneAPI Math Kernel Library for C

df?EditIdxPtr

Syntax

Include Files

Input Parameters

Output Parameters

Description