zeroLowerTriangle¶
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class zeroLowerTriangle : public kotekan::Stage¶
Zeroes out the lower-triangle of a correlation matrix stream. Created to test the CudaCorrelator stage, which writes some junk in the lower triangle.
An example of this stage being used can be found in
config/tests/verify_cuda_n2k.yaml.There are (samples_per_data_set / nt_inner) matrices per kotekan block, each (num_local_freq * num_elements * num_elements) in size. This stage copies only the upper-triangle part of the N*N matrix from the input buffer to the output, zeroing out the lower-triangle.
- Buffers
corr_in_bufThe input correlation matrix whose lower-triangle is to be zeroed out. Size per frame: num_local_freq * (samples_per_data_set / sub_integration_ntime) * num_elements^2 * 2 * sizeof(int32)Format: int32 complex
curr_out_bufThe output correlation matrix with zeroed-out lower triangle. Size per frame: num_local_freq * (samples_per_data_set / sub_integration_ntime) * num_elements^2 * 2 * sizeof(int32)Format: int32 complex
- Param num_elements:
Int. Number of radio input feeds.
- Param num_local_freq:
Int. Number of frequencies in the correlation matrix.
- Param samples_per_data_set:
Int. Time samples per frame.
- Param sub_integration_ntime:
Int. Number of time samples that are summed into each correlation matrix.