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 # math:fft multi harmonic solution minmax

 Last update: 31.07.2026 

**Version: 0.0.0**

## Description

Evaluate min max fields on multi harmonic solution. min and max fields are calculated based on evaluating a fourier series sum wrt rpms and using the gradient method for adaptive time steping

## Inputs

This table lists the input pins for this operator. Input pins define the data that the operator requires to perform its operation. Some inputs are required, while others are optional and provide additional configuration. Each parameter is detailed in the sections that follow the table.

Pin numberNameStatusExpected type(s)0[fields\_container](#input_0)Required[`fields_container`](../../core-concepts/dpf-types.md#fields-container)**1**[rpm\_scoping](#input_1)[`scoping`](../../core-concepts/dpf-types.md#scoping)**2**[fs\_ratio](#input_2)[`int32`](../../core-concepts/dpf-types.md#standard-types)**3**[num\_subdivisions](#input_3)[`int32`](../../core-concepts/dpf-types.md#standard-types)**4**[max\_num\_subdivisions](#input_4)[`int32`](../../core-concepts/dpf-types.md#standard-types)**5**[num\_cycles](#input_5)[`int32`](../../core-concepts/dpf-types.md#standard-types)**6**[use\_harmonic\_zero](#input_6)[`bool`](../../core-concepts/dpf-types.md#standard-types)**7**[calculate\_time\_series](#input_7)[`bool`](../../core-concepts/dpf-types.md#standard-types)**8**[substeps\_selector](#input_8)[`vector<int32>`](../../core-concepts/dpf-types.md#standard-types)<a id="input_0"></a>

### fields\_container (Pin 0)

- **Required:** Yes
- **Expected type(s):** [`fields_container`](../../core-concepts/dpf-types.md#fields-container)

<a id="input_1"></a>

### rpm\_scoping (Pin 1)

- **Required:** No
- **Expected type(s):** [`scoping`](../../core-concepts/dpf-types.md#scoping)

rpm scoping, by default the fourier series sum is evaluated using all the rpms

<a id="input_2"></a>

### fs\_ratio (Pin 2)

- **Required:** No
- **Expected type(s):** [`int32`](../../core-concepts/dpf-types.md#standard-types)

field or fields container with only one field is expected

<a id="input_3"></a>

### num\_subdivisions (Pin 3)

- **Required:** No
- **Expected type(s):** [`int32`](../../core-concepts/dpf-types.md#standard-types)

connect number subdivisions, used for uniform discretization

<a id="input_4"></a>

### max\_num\_subdivisions (Pin 4)

- **Required:** No
- **Expected type(s):** [`int32`](../../core-concepts/dpf-types.md#standard-types)

connect max number subdivisions, used to avoid huge number of sudivisions

<a id="input_5"></a>

### num\_cycles (Pin 5)

- **Required:** No
- **Expected type(s):** [`int32`](../../core-concepts/dpf-types.md#standard-types)

Number of cycle of the periodic signal (default is 2)

<a id="input_6"></a>

### use\_harmonic\_zero (Pin 6)

- **Required:** No
- **Expected type(s):** [`bool`](../../core-concepts/dpf-types.md#standard-types)

use harmonic zero for first rpm (default is false)

<a id="input_7"></a>

### calculate\_time\_series (Pin 7)

- **Required:** No
- **Expected type(s):** [`bool`](../../core-concepts/dpf-types.md#standard-types)

calculates time series output (output pin 2), setting it to false enhance performance if only min/max are required (default is true)

<a id="input_8"></a>

### substeps\_selector (Pin 8)

- **Required:** No
- **Expected type(s):** [`vector<int32>`](../../core-concepts/dpf-types.md#standard-types)

substeps to evaluate (frequencies), by default the operator is evaluated using all the available steps

## Outputs

This table lists the output pins for this operator. Output pins provide the results of the operator's computation and can be connected to inputs of other operators or retrieved for further processing. Each output is detailed in the sections that follow the table.

Pin numberNameExpected type(s)0[field\_min](#output_0)[`fields_container`](../../core-concepts/dpf-types.md#fields-container)**1**[field\_max](#output_1)[`fields_container`](../../core-concepts/dpf-types.md#fields-container)**2**[all\_fields](#output_2)[`fields_container`](../../core-concepts/dpf-types.md#fields-container)<a id="output_0"></a>

### field\_min (Pin 0)

- **Expected type(s):** [`fields_container`](../../core-concepts/dpf-types.md#fields-container)

<a id="output_1"></a>

### field\_max (Pin 1)

- **Expected type(s):** [`fields_container`](../../core-concepts/dpf-types.md#fields-container)

<a id="output_2"></a>

### all\_fields (Pin 2)

- **Expected type(s):** [`fields_container`](../../core-concepts/dpf-types.md#fields-container)

## Configurations

This operator supports [configuration options](../../core-concepts/operator-configurations.md) that modify its behavior.

### [mutex](../../core-concepts/operator-configurations.md#mutex)

- **Expected type(s):** [`bool`](../../core-concepts/dpf-types.md#standard-types)
- **Default value:** false

If this option is set to true, the shared memory is prevented from being simultaneously accessed by multiple threads.

## Scripting

This operator can be accessed through scripting interfaces using these identifiers.

**Category**: math

**Plugin**: core

**Scripting name**: fft\_multi\_harmonic\_minmax

**Full name**: math.fft\_multi\_harmonic\_minmax

**Internal name**: fft\_multi\_harmonic\_minmax

**License**: any\_dpf\_supported\_increments

## Examples

These examples demonstrate how to use this operator in different programming environments. Each example shows how to instantiate the operator, connect the required inputs, and retrieve the output.

C++```cpp
#include "dpf_api.h"

ansys::dpf::Operator op("fft_multi_harmonic_minmax"); // operator instantiation
op.connect(0, my_fields_container);
op.connect(1, my_rpm_scoping);
op.connect(2, my_fs_ratio);
op.connect(3, my_num_subdivisions);
op.connect(4, my_max_num_subdivisions);
op.connect(5, my_num_cycles);
op.connect(6, my_use_harmonic_zero);
op.connect(7, my_calculate_time_series);
op.connect(8, my_substeps_selector);
ansys::dpf::FieldsContainer my_field_min = op.getOutput<ansys::dpf::FieldsContainer>(0);
ansys::dpf::FieldsContainer my_field_max = op.getOutput<ansys::dpf::FieldsContainer>(1);
ansys::dpf::FieldsContainer my_all_fields = op.getOutput<ansys::dpf::FieldsContainer>(2);

```

CPython```python
import ansys.dpf.core as dpf

op = dpf.operators.math.fft_multi_harmonic_minmax() # operator instantiation
op.inputs.fields_container.connect(my_fields_container)
op.inputs.rpm_scoping.connect(my_rpm_scoping)
op.inputs.fs_ratio.connect(my_fs_ratio)
op.inputs.num_subdivisions.connect(my_num_subdivisions)
op.inputs.max_num_subdivisions.connect(my_max_num_subdivisions)
op.inputs.num_cycles.connect(my_num_cycles)
op.inputs.use_harmonic_zero.connect(my_use_harmonic_zero)
op.inputs.calculate_time_series.connect(my_calculate_time_series)
op.inputs.substeps_selector.connect(my_substeps_selector)
my_field_min = op.outputs.field_min()
my_field_max = op.outputs.field_max()
my_all_fields = op.outputs.all_fields()

```

IPython```python
import mech_dpf
import Ans.DataProcessing as dpf

op = dpf.operators.math.fft_multi_harmonic_minmax() # operator instantiation
op.inputs.fields_container.Connect(my_fields_container)
op.inputs.rpm_scoping.Connect(my_rpm_scoping)
op.inputs.fs_ratio.Connect(my_fs_ratio)
op.inputs.num_subdivisions.Connect(my_num_subdivisions)
op.inputs.max_num_subdivisions.Connect(my_max_num_subdivisions)
op.inputs.num_cycles.Connect(my_num_cycles)
op.inputs.use_harmonic_zero.Connect(my_use_harmonic_zero)
op.inputs.calculate_time_series.Connect(my_calculate_time_series)
op.inputs.substeps_selector.Connect(my_substeps_selector)
my_field_min = op.outputs.field_min.GetData()
my_field_max = op.outputs.field_max.GetData()
my_all_fields = op.outputs.all_fields.GetData()

```

  
## Changelog

- Version 0.0.0: Initial release.