Gwyddion – Free SPM (AFM, SNOM/NSOM, STM, MFM, …) data analysis software

arithmetic

arithmetic — Arithmetic opetations on data fields

Functions

void gwy_data_field_sum_fields ()
void gwy_data_field_subtract_fields ()
void gwy_data_field_divide_fields ()
void gwy_data_field_multiply_fields ()
void gwy_data_field_min_of_fields ()
void gwy_data_field_max_of_fields ()
void gwy_data_field_hypot_of_fields ()
GwyDataCompatibilityFlags gwy_data_field_check_compatibility ()
GwyDataCompatibilityFlags gwy_data_line_check_compatibility ()
GwyDataCompatibilityFlags gwy_brick_check_compatibility ()
GwyDataCompatibilityFlags gwy_data_field_check_compatibility_with_brick_xy ()
GwyDataCompatibilityFlags gwy_data_line_check_compatibility_with_brick_z ()
GwyDataField * gwy_data_field_extend ()

Includes

#include <libprocess/gwyprocess.h>

Description

Data arithmetic functions perform simple operations combining several data fields. Their sizes have to be size-compatible, i.e. gwy_data_field_check_compatibility(operand1, operand2, GWY_DATA_COMPATIBILITY_RES) must pass and the same must hold for the data field to store the result to.

Functions gwy_data_field_check_compatibility(), gwy_data_line_check_compatibility() and gwy_brick_check_compatibility() simplify testing compatibility of data fields, lines and bricks, respectively.

Functions

gwy_data_field_sum_fields ()

void
gwy_data_field_sum_fields (GwyDataField *result,
                           GwyDataField *operand1,
                           GwyDataField *operand2);

Sums two data fields.

Parameters

result

A data field to put the result to. May be one of operand1 , operand2 .

 

operand1

First data field operand.

 

operand2

Second data field operand.

 

gwy_data_field_subtract_fields ()

void
gwy_data_field_subtract_fields (GwyDataField *result,
                                GwyDataField *operand1,
                                GwyDataField *operand2);

Subtracts one data field from another.

Parameters

result

A data field to put the result to. May be one of operand1 , operand2 .

 

operand1

First data field operand.

 

operand2

Second data field operand.

 

gwy_data_field_divide_fields ()

void
gwy_data_field_divide_fields (GwyDataField *result,
                              GwyDataField *operand1,
                              GwyDataField *operand2);

Divides one data field with another.

Parameters

result

A data field to put the result to. May be one of operand1 , operand2 .

 

operand1

First data field operand.

 

operand2

Second data field operand.

 

gwy_data_field_multiply_fields ()

void
gwy_data_field_multiply_fields (GwyDataField *result,
                                GwyDataField *operand1,
                                GwyDataField *operand2);

Multiplies two data fields.

Parameters

result

A data field to put the result to. May be one of operand1 , operand2 .

 

operand1

First data field operand.

 

operand2

Second data field operand.

 

gwy_data_field_min_of_fields ()

void
gwy_data_field_min_of_fields (GwyDataField *result,
                              GwyDataField *operand1,
                              GwyDataField *operand2);

Finds point-wise maxima of two data fields.

Parameters

result

A data field to put the result to. May be one of operand1 , operand2 .

 

operand1

First data field operand.

 

operand2

Second data field operand.

 

gwy_data_field_max_of_fields ()

void
gwy_data_field_max_of_fields (GwyDataField *result,
                              GwyDataField *operand1,
                              GwyDataField *operand2);

Finds point-wise minima of two data fields.

Parameters

result

A data field to put the result to. May be one of operand1 , operand2 .

 

operand1

First data field operand.

 

operand2

Second data field operand.

 

gwy_data_field_hypot_of_fields ()

void
gwy_data_field_hypot_of_fields (GwyDataField *result,
                                GwyDataField *operand1,
                                GwyDataField *operand2);

Finds point-wise hypotenuse of two data fields.

Parameters

result

A data field to put the result to. May be one of operand1 , operand2 .

 

operand1

First data field operand.

 

operand2

Second data field operand.

 

Since: 2.31

gwy_data_field_check_compatibility ()

GwyDataCompatibilityFlags
gwy_data_field_check_compatibility (GwyDataField *data_field1,
                                    GwyDataField *data_field2,
                                    GwyDataCompatibilityFlags check);

Checks whether two data fields are compatible.

Parameters

data_field1

A data field.

 

data_field2

Another data field.

 

check

The compatibility tests to perform.

 

Returns

Zero if all tested properties are compatible. Flags corresponding to failed tests if data fields are not compatible.

gwy_data_line_check_compatibility ()

GwyDataCompatibilityFlags
gwy_data_line_check_compatibility (GwyDataLine *data_line1,
                                   GwyDataLine *data_line2,
                                   GwyDataCompatibilityFlags check);

Checks whether two data lines are compatible.

Parameters

data_line1

A data line.

 

data_line2

Another data line.

 

check

The compatibility tests to perform.

 

Returns

Zero if all tested properties are compatible. Flags corresponding to failed tests if data lines are not compatible.

gwy_brick_check_compatibility ()

GwyDataCompatibilityFlags
gwy_brick_check_compatibility (GwyBrick *brick1,
                               GwyBrick *brick2,
                               GwyDataCompatibilityFlags check);

Checks whether two data bricks are compatible.

Real dimensions are checked without regard to calibration. Calibrations are considered compatible if either both exist and are identical or none exists.

Parameters

brick1

A data brick.

 

brick2

Another data brick.

 

check

The compatibility tests to perform.

 

Returns

Zero if all tested properties are compatible. Flags corresponding to failed tests if bricks are not compatible.

Since: 2.51

gwy_data_field_check_compatibility_with_brick_xy ()

GwyDataCompatibilityFlags
gwy_data_field_check_compatibility_with_brick_xy
                               (GwyDataField *data_field,
                                GwyBrick *brick,
                                GwyDataCompatibilityFlags check);

Checks whether a data field is compatible with brick XY-planes.

Parameters

data_field

A two-dimensional data field.

 

brick

A three-dimensional data brick.

 

check

The compatibility tests to perform.

 

Returns

Zero if all tested properties are compatible. Flags corresponding to failed tests if the data objects are not compatible.

Since: 2.51

gwy_data_line_check_compatibility_with_brick_z ()

GwyDataCompatibilityFlags
gwy_data_line_check_compatibility_with_brick_z
                               (GwyDataLine *data_line,
                                GwyBrick *brick,
                                GwyDataCompatibilityFlags check);

Checks whether a data line is compatible with brick Z-profiles.

If check includes GWY_DATA_COMPATIBILITY_REAL or GWY_DATA_COMPATIBILITY_LATERAL but not GWY_DATA_COMPATIBILITY_AXISCAL, data_line is simply compared to brick in the Z direction.

If you include GWY_DATA_COMPATIBILITY_AXISCAL and brick has a Z-calibration data line, then the value range and units of this data line are compared to data_line . This may not be very useful.

Parameters

data_line

A one-dimensional data line.

 

brick

A three-dimensional data brick.

 

check

The compatibility tests to perform.

 

Returns

Zero if all tested properties are compatible. Flags corresponding to failed tests if the data objects are not compatible.

Since: 2.51

gwy_data_field_extend ()

GwyDataField *
gwy_data_field_extend (GwyDataField *data_field,
                       guint left,
                       guint right,
                       guint up,
                       guint down,
                       GwyExteriorType exterior,
                       gdouble fill_value,
                       gboolean keep_offsets);

Creates a new data field by extending another data field using the specified method of exterior handling.

Parameters

data_field

A two-dimensional data field.

 

left

Number of pixels to extend to the left (towards lower column indices).

 

right

Number of pixels to extend to the right (towards higher column indices).

 

up

Number of pixels to extend up (towards lower row indices).

 

down

Number of pixels to extend down (towards higher row indices).

 

exterior

Exterior pixels handling.

 

fill_value

The value to use with GWY_EXTERIOR_FIXED_VALUE exterior.

 

keep_offsets

TRUE to set the X and Y offsets of the new field using field offsets. FALSE to set offsets of the new field to zeroes.

 

Returns

A newly created data field.

Since: 2.36

Types and Values

© David Nečas and Petr Klapetek

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