find_peaks

find_peaks#

Finds the peaks in a 1D input operator.

Currently only the height and threshold parameters are supported.

Added in version 0.6.0.

template<typename InType>
__MATX_INLINE__ auto matx::find_peaks(const InType &in, typename InType::value_type height, typename InType::value_type threshold)#

Compute peak search of input

Returns a tensor representing the indices of peaks found in the input operator. The first output parameter holds the indices while the second holds the number of indices/peaks found. The output index tensor must be large enough to hold all of the peaks found or the behavior is undefined.

Template Parameters:

  • InType – Input data type

  • D – Number of right-most dimensions to reduce over

Parameters:

  • in – Input data to reduce

  • height – Height threshold for peak detection. Values below this threshold are not considered peaks.

  • threshold – Threshold for peak detection. Neighboring values must be larger in vertical distance than this threshold

Returns:

Operator with reduced values of peak search computed

Examples#

auto tiv = make_tensor<TestType>({32});
auto tidx = make_tensor<index_t>({32});
tiv.SetVals({ static_cast<TestType>(3.9905e-01), static_cast<TestType>(5.1668e-01), static_cast<TestType>(2.4930e-02), static_cast<TestType>(9.4008e-01), static_cast<TestType>(9.4585e-01), static_cast<TestType>(7.9673e-01), static_cast<TestType>(4.1501e-01), static_cast<TestType>(8.2026e-01), static_cast<TestType>(2.2904e-01), static_cast<TestType>(9.0959e-01), static_cast<TestType>(1.0000e+01),
  static_cast<TestType>(7.5222e-02), static_cast<TestType>(4.0922e-01), static_cast<TestType>(9.6007e-01), static_cast<TestType>(2.0930e-01), static_cast<TestType>(1.9395e-01), static_cast<TestType>(8.9094e-01), static_cast<TestType>(4.3867e-01), static_cast<TestType>(3.5698e-01), static_cast<TestType>(5.4537e-01), static_cast<TestType>(8.2992e-01), static_cast<TestType>(2.0994e-01), static_cast<TestType>(7.6842e-01),
  static_cast<TestType>(4.2899e-01), static_cast<TestType>(2.1167e-01), static_cast<TestType>(6.6055e-01), static_cast<TestType>(1.6536e-01), static_cast<TestType>(4.2499e-01), static_cast<TestType>(9.9267e-01), static_cast<TestType>(6.9642e-01), static_cast<TestType>(2.4719e-01), static_cast<TestType>(7.0281e-01)});
auto num_found = make_tensor<int>({});

(mtie(tidx, num_found) = find_peaks(tiv, static_cast<TestType>(0.5), static_cast<TestType>(0.1))).run(exec);
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